Amazon Kindle is a series of e-readers designed and marketed by Amazon. Amazon Kindle devices enable users to browse, buy, download, and read e-books, newspapers, magazines and other digital media via wireless networking to the Kindle Store. The hardware platform, which Amazon subsidiary Lab126 developed, began as a single device in 2007. Currently, it comprises a range of devices, including e-readers with E Ink electronic paper displays and Kindle applications on all major computing platforms. All Kindle devices integrate with Kindle Store content and, as of March 2018, the store had over six million e-books available in the United States.
|Release date||November 19, 2007|
|Introductory price||Kindle 1: US$399|
|Operating system||Kindle firmware that uses Linux kernels 2.6.10 to 3.0|
(latest version available)
|CPU||Kindle 1: Marvell Xscale PXA255 400 MHz, ARM9|
Kindle 2, DX: Freescale i.MX31 532 MHz, ARM11
Kindle 1: 6-inch (152 mm), 600 × 800 pixels, 167 PPI density, 4-level grayscale
|Sound||Speakers (Kindle 1, 2, DX, Keyboard, Touch)|
|Input||USB 2.0 port, SD card (Kindle 1 only), 3.5 mm headphone jack (Kindle 1, 2, DX, Keyboard, & Touch)|
|Controller input||D-pad and keyboard (select models), touchscreen (select models)|
|Online services||Kindle Store|
- 1 Naming and evolution
- 2 Devices
- 2.1 First generation
- 2.2 Second generation
- 2.3 Third generation
- 2.4 Fourth generation
- 2.5 Fifth generation
- 2.6 Sixth generation
- 2.7 Seventh generation
- 2.8 Eighth generation
- 2.9 Ninth generation
- 2.10 Tenth generation
- 3 Specifications
- 4 Official accessories
- 5 Features
- 6 Kindle ecosystem
- 7 Reception
- 8 Criticism
- 9 See also
- 10 References
- 11 External links
Naming and evolution
In 2004, Amazon founder and CEO Jeff Bezos instructed the company's employees to build the world's best e-reader before Amazon's competitors could. Amazon originally used the codename Fiona for the device.
Branding consultants Michael Cronan and Karin Hibma devised the Kindle name. Lab126 asked them to name the product, and they suggested "kindle", meaning to light a fire. They felt this was an apt metaphor for reading and intellectual excitement.
Kindle hardware has evolved from the original Kindle introduced in 2007 and the Kindle DX (with its larger screen) introduced in 2009. The range includes devices with a keyboard (Kindle Keyboard), devices with touch-sensitive, lighted high-resolution screens (Kindle Paperwhite), a tablet computer with the Kindle app (Kindle Fire), and low-priced devices with a touch-sensitive screen (Kindle 7). However, the Kindle e-reader has always been a single-purpose device for reading rather than being multipurpose hardware that might create distractions while reading.
Amazon has also introduced Kindle apps for use on various devices and platforms, including Windows, macOS, Android, iOS, BlackBerry 10 and Windows Phone. Amazon also has a cloud reader to allow users to read e-books using modern web browsers.
The device featured a six-inch (diagonal) four-level grayscale E Ink display, with 250 MB of internal storage, which can hold approximately 200 non-illustrated titles. It also has a speaker and a headphone jack for listening to audio files. It has expandable storage via an SD card slot. Content was available from Amazon via the Sprint Corporation US-wide EVDO 3G data network, via a dedicated connection protocol which Amazon called Whispernet. Amazon did not sell the first-generation Kindle outside of the US.
On February 10, 2009, Amazon announced the Kindle 2, the second-generation Kindle. It became available for purchase on February 23, 2009. The Kindle 2 features a text-to-speech option to read the text aloud. It also has 2 GB of internal memory, of which 1.4 GB is user-accessible. By Amazon's estimates, the Kindle 2 can hold about 1,500 non-illustrated books. Unlike the first-generation Kindle, Kindle 2 does not have a slot for SD memory cards. It is slimmer than the original Kindle. The Kindle 2 features a Freescale 532 MHz, ARM-11 90 nm processor, 32 MB main memory, 2 GB flash memory and a 3.7 V 1,530 mAh lithium polymer battery.
Kindle 2 international
On October 7, 2009, Amazon announced an international version of the Kindle 2 with the ability to download e-books wirelessly. This version released in over 100 countries. It became available on October 19, 2009. The international Kindle 2 is physically the same as the U.S.-only Kindle 2, although it uses a different mobile network standard.
The original Kindle 2 used CDMA2000 for use on the Sprint network. The international version used standard GSM and 3G GSM, enabling it to be used on AT&T's U.S. mobile network and internationally in 100 other countries.
Amazon launched the Kindle DX on May 6, 2009. This device has the largest Kindle screen at 9.7 inches and supports displaying PDF files. It was marketed as more suitable for displaying newspaper and textbook content, includes built-in speakers, and has an accelerometer that enables users to rotate pages between landscape and portrait orientations when the Kindle DX is turned on its side. The device can only connect to Whispernet while in the U.S.
Kindle DX international
On January 19, 2010, the Kindle DX international version was released in over 100 countries. The Kindle DX international version is the same as the Kindle DX, except for having support for international 3G data.
Kindle DX Graphite
On July 1, 2010, Amazon released the Kindle DX Graphite (DXG) globally. The DXG has an E Ink display with 50% better contrast ratio due to using E Ink Pearl technology and comes only in a graphite case color. It is speculated the case color change is to improve contrast ratio perception further, as some users found the prior white casing highlighted that the E Ink background is light gray and not white. Like the Kindle DX, it does not have a Wi-Fi connection. The DXG is a mix of third-generation hardware and second-generation software. The CPU has the same speed as Kindle Keyboard's CPU, but the DXG has only half the system memory, 128MB. Due to these differences, the DXG runs the same firmware as Kindle 2. Therefore, DXG cannot display international fonts, like Cyrillic, Chinese, or any other non-Latin font, and PDF support and the web browser are limited to matching the Kindle 2's features.
Amazon withdrew the Kindle DX from sale in October 2012, but in September 2013 made it available again for a few months. Using 3G data is free when accessing the Kindle Store and Wikipedia. Downloading personal documents via 3G data costs about $1 per megabyte. Its battery life is about one week with 3G on and two weeks with 3G off. Text-to-Speech and MP3 playback are supported.
Amazon announced the third-generation Kindle, later renamed "Kindle Keyboard", on July 28, 2010. Amazon began accepting pre-orders for the Kindle Keyboard as soon as it was announced and began shipping the devices on August 27, 2010. On August 25, Amazon announced that the Kindle Keyboard was the fastest-selling Kindle ever. While Amazon does not officially add numbers to the end of each Kindle denoting its generation, reviewers, customers and press companies often referred to this Kindle as the "K3" or the "Kindle 3". The Kindle Keyboard has a 6-inch screen with a resolution of 600x800 (167 PPI).
The Kindle Keyboard was available in two versions. One of these, the Kindle Wi-Fi, was initially priced at $139 and connects to the Internet via Wi-Fi networks. The other version, called the Kindle 3G, was priced at $189 and includes both 3G and Wi-Fi connectivity. The built-in free 3G connectivity uses the same wireless signals that cell phones use, allowing it to download and purchase content from any location with cell service. The Kindle Keyboard is available in two colors: classic white and graphite. Both versions use an E Ink "Pearl" display, which has a higher contrast than prior displays and a faster refresh rate than prior e-ink displays. However, it remains significantly slower than traditional LCDs. An ad-supported version, the "Kindle with Special Offers", was introduced on May 3, 2011, with a price $25 lower than the no-ad version, for $114. On July 13, 2011, Amazon announced that due to a sponsorship with AT&T, the price of the Kindle 3G with ads would be $139, $50 less than the Kindle 3G without ads.
The Kindle Keyboard is 0.5 inches shorter and 0.5 inches narrower than the Kindle 2. It supports additional fonts and international Unicode characters and has a Voice Guide feature with spoken menu navigation from the built-in speakers or audio jack. Internal memory is expanded to 4 GB, with approximately 3 GB available for user content. Battery life is advertised at up to two months of reading half an hour a day with the wireless turned off, which amounts to roughly 30 hours.
The Kindle Keyboard generally received good reviews after launch. Review Horizon describes the device as offering "the best reading experience in its class" while Engadget states, "In the standalone category, the Kindle is probably the one to beat".
The fourth-generation Kindle and the Kindle Touch were announced on September 28, 2011. They retain the 6-inch, 167-PPI e-ink display of the 2010 Kindle model, with the addition of an infrared touch-screen control on the Touch. They also include Amazon's experimental web-browsing capability with Wi-Fi. On the same date, Amazon announced the Kindle Fire, a tablet computer including a Kindle app; in September 2014, Kindle was dropped from the Amazon Fire's name.
The fourth-generation Kindle was significantly less expensive (initially $79 ad supported, $109 no ads) and features a slight reduction in weight and size, with a reduced battery life and storage capacity, compared to the Kindle 3. It has a silver-grey bezel, 6-inch display, nine hard keys, a cursor pad, an on-screen rather than physical keyboard, a flash storage capacity of 2 GB, and an estimated one month battery life under ideal reading conditions.
Amazon introduced two versions of touchscreen Kindles: the Kindle Touch, available with Wi-Fi (initially $99 ad-supported, $139 no ads), and the Kindle Touch 3G, with Wi-Fi/3G connectivity (initially $149 ad-supported, $189 no ads). The latter version is capable of connect via 3G to the Kindle Store, download books and periodicals, and access Wikipedia. Experimental web browsing (outside Wikipedia) on Kindle Touch 3G is only available over a Wi-Fi connection. (Kindle Keyboard does not have this restriction). The usage of the 3G data is limited to 50MB per month. Like the Kindle 3, the Kindle Touch has a capacity of 4 GB and battery life of two months under ideal reading conditions, and is larger than the Kindle 4. The Kindle Touch was released on November 15, 2011. Amazon announced in March 2012 that the device would be available in the UK, Germany, France, Spain and Italy on April 27, 2012. The Touch was the first Kindle to support X-Ray, which lists the commonly used character names, locations, themes, or ideas in a book. In January 2013, Amazon released the 5.2.0 firmware that updated the operating system to match the Paperwhite's interface with the Touch's MP3/audiobook capabilities remaining.
Amazon released the Kindle 5 on September 6, 2012 ($70 ad-supported, $90 no ads). The Kindle has a black bezel, differing from the Kindle 4 which was available in silver-grey, and has better display contrast. Amazon also claims that it has 15% faster page loads. It has a 167 PPI display and was the lightest Kindle, at 5.98 ounce, until 2016's Kindle Oasis.
Kindle Paperwhite (First generation)
The first-generation Kindle Paperwhite was announced on September 6, 2012, and released on October 1. It has a 6 in, 212 PPI E Ink Pearl display (758×1024 resolution) with four built-in LEDs to illuminate the screen. It was available in Wi-Fi ($120 ad-supported, $140 no ads) and Wi-Fi + 3G ($180 ad-supported, $200 no ads) models, with the ad-supported options only intended to be available in the United States. The light is one of the main features of the Paperwhite and it has a manually adjusted light level. The 3G access restrictions are the same as the Kindle Touch, and usage of the 3G data is limited to 50 MB per month and only on Amazon and Wikipedia's websites; additional data may be bought. Battery life is advertised as up to eight weeks of reading with half an hour per day with wireless off and constant light use; this usage equals 28 hours. The official leather cover for the Paperwhite uses a hall effect sensor to detect when the cover is closed or opened and turn the screen off or on respectively. This was the first Kindle model to track reading speed to estimate when the reader will finish a chapter or book; this feature was later included with updates to the other models of Kindle and Kindle Fire. The Kindle Paperwhite lacks physical buttons for page turning and does not perform auto-hyphenation. Except for the lock screen/power button at its bottom, it relies solely on the touchscreen interface.
In November 2012, Amazon released the 5.3.0 update that allowed users to turn off recommended content on the home screen in Grid View (allowing two rows of user content) and included general bug fixes. In March 2014, the Paperwhite 5.4.4 update was released that added Goodreads integration, Kindle FreeTime to restrict usage for children, Cloud Collections for organization and Page Flip for scanning content without losing your place, which closely matched the Paperwhite 2's software features.
The Kindle Paperwhite was released in most major international markets in early 2013, with Japan's version including 4 GB of storage, and in China on June 7, 2013; all non-Japan versions have 2 GB of storage (1.25 GB usable).
Engadget praised the Paperwhite, giving it 92 of 100. The reviewer liked the front-lit display, high contrast, and useful software features, but did not like that it was less comfortable to hold than the Nook, the starting price includes ads, and it had no expandable storage.
Shortly after release, some users complained about the lighting implementation on the Kindle Paperwhite. While not widespread, some users found the lighting inconsistent, causing the bottom edge to cast irregular shadows. Also, some users complained that the light cannot be turned off completely.
Kindle Paperwhite (second generation)
Amazon announced the second-generation Kindle Paperwhite, marketed as the "All-New Kindle Paperwhite" and colloquially referred to as the Paperwhite 2, on September 3, 2013; the Wi-Fi version was released in on September 30 ($120 ad-supported, $140 no ads), and the 3G/Wi-Fi version was released in the US on November 5, 2013 ($190 ad-supported, $210 no ads). The Paperwhite 2 features a higher contrast E Ink Carta display technology, improved LED illumination, 25% faster processor (1 GHz) that allows for faster page turns, and better response to touch input compared to the original Paperwhite. It has the same 6" screen with 212 PPI, bezel and estimated 28-hour battery life as the original Paperwhite. The software features dictionary/Wikipedia/X-Ray look-up, Page Flip that allows the user to skip ahead or back in the text in a pop-up window and go back to the previous page, and Goodreads social integration.
The Paperwhite 2 uses a similar experimental web browser with the same 3G data use restrictions as previous Kindles; there are no use restrictions when using Wi-Fi. The official Amazon leather cover for the Paperwhite 2 is the same item as was used for the original Paperwhite. The cover's magnets turn the screen on and off when it is opened and closed.
Although released in 2013 with 2GB of storage, all versions of the Paperwhite 2 were sold with 4GB of storage by September 2014.
Amazon announced an upgraded basic Kindle and the Kindle Voyage on September 18, 2014. The Kindle 7 was released on October 2, 2014 ($80 ad-supported, $100 no ads). It is the first basic Kindle to use a touchscreen for navigating within books and to have a 1 GHz CPU. It is also the first basic Kindle available in international markets such as India, Japan and China. Amazon claims that a single charge lasts up to 30 days if used for 30 minutes a day without using Wi-Fi.
The Kindle Voyage was released on November 4, 2014, in the US It has a 6-inch, 300 ppi E Ink Carta HD display, which was the highest resolution and contrast available in e-readers, as of 2014, with six LEDs with an adaptive light sensor that can automatically illuminate the screen depending on the environment. It is available in Wi-Fi ($200 ad-supported, $220 no ads) and Wi-Fi + 3G ($270 ad-supported, $290 no ads) models. It has 4GB of storage. Its design features a flush glass screen on the front and the rear has angular, raised plastic edges that house the power button, similar to the Fire HDX. The Voyage uses "PagePress", a navigation system that has sensors on either side of the screen that turns the page when pressed. PagePress may be disabled, but the touchscreen is always active.
The Verge rated the Voyage as 9.1 of 10, stating that "this is the best E Ink e-reader I've used, and it's unquestionably the best that Amazon has ever made. The thing is, it's only marginally better than the fantastic Paperwhite in several ways, and significantly better in none" and with those differences in mind, disliked how it costs $80 more than the Paperwhite. Engadget rated the Voyage as 94 of 100, stating that while it was "easily the best e-reader that Amazon has ever crafted," it was also the priciest at $199.
Kindle Paperwhite (third generation)
The third-generation Kindle Paperwhite, marketed as the "All-New Kindle Paperwhite" and colloquially referred to as the Paperwhite 3 and Paperwhite 2015, was released on June 30, 2015, in the US. It is available in Wi-Fi ($120 ad-supported, $140 no ads) and Wi-Fi + 3G ($190 ad-supported, $210 no ads) models. It has a 6-inch, 1448×1072, 300 ppi E Ink Carta HD display, which is twice the pixels of the original Paperwhite and has the same touchscreen, four LEDs and size as the previous Paperwhite. It has over 3 GB of user accessible storage. This device improved on the display of PDF files, with the possibility to select text and use some functionalities, such as translation on a PDF's text. Amazon claims it has 6 weeks of battery life if used for 30 minutes per day with wireless off and brightness set to 10, which is about 21 hours.
The Paperwhite 3 is the first e-reader to include the Bookerly font, a new font designed by Amazon, and includes updated formatting functions such as hyphenation and improved spacing. The Bookerly font was added to most older models via a firmware update. The official Amazon leather cover for the Paperwhite 3 is the same item as was used with the previous two Paperwhite devices.
In February 2016, the Paperwhite 2, Paperwhite 3, Kindle 7, and Voyage received the 5.7.2 update that included a new home screen layout, an OpenDyslexic font choice, improved book recommendations and a new quick actions menu.
On June 30, 2016, Amazon released a white version of the Paperwhite 3 worldwide; the only thing different about this version is the color of the shell.
In October 2016, Amazon released the Paperwhite 3 "Manga Model" in Japan that has a 33% increase in page-turning speed and includes 32GB of storage, which is space for up to 700 manga books. The Manga model launched at 16,280 yen (~$156) for the ad-supported Wi-Fi version or 12,280 yen (~$118) for Prime members.
The Verge rated the Paperwhite 3 as 9.0 of 10, saying that "The Kindle Paperwhite is the best e-reader for most people by a wide margin" and liked the high-resolution screen but disliked that there was no adaptive backlight; this is featured on the Kindle Voyage. Popzara called the 2015 Paperwhite "the best dedicated E Ink e-reader for the money."
Kindle Oasis (first generation)
Amazon announced the first-generation Kindle Oasis on April 13, 2016, and it was released on April 27 worldwide. The Kindle Oasis is available in Wi-Fi and Wi-Fi + 3G models. The Oasis has a 6-inch, 300 ppi E Ink Carta HD display with ten LEDs. Its asymmetrical design features physical page turn buttons on one side and it has an accelerometer so the display can be rotated for one-hand operation with either hand. It has one thicker side that tapers to an edge that is 20% thinner than the Paperwhite. It includes a removable leather battery cover for device protection and increased battery life that is available in either black, walnut (brown) or merlot (red); the cover fits in the tapered edge. The Oasis has 28 hours of battery life if used with the battery cover with Wi-Fi off. However, without the cover, the Oasis battery lasts about seven hours. It has nearly 3 GB of user storage. The Oasis includes the Bookerly (serif) font and it is the first Kindle to include the Amazon Ember (sans-serif) font.
The Guardian's reviewer praised the Oasis's ease for holding, its lightweight design, long battery life, excellent display, even front lighting, usable page-turn buttons, and the luxurious cover. However, the reviewer believed the product was overpriced, noted that the battery cover only partially protects the back, and that the reader is not waterproof. The reviewer concluded, "…the Paperwhite will likely be all the e-reader most will need, but Oasis is the one you'll want. The Oasis is the Bentley to the Paperwhite's Golf – both will get the job done, just one is a cut above the other." The Verge rated the Oasis as 9 of 10, praising its thinness, its weight without the cover and the ability to read with one hand, but did not like that is so expensive, has no adaptive backlight like the Voyage and it is not waterproof.
Amazon's upgrade of the standard Kindle was released on June 22, 2016 in both black and white colors ($80 ad-supported, $100 no ads). The Kindle 8 features a new rounded design that is 0.35 inches (9 mm) shorter, 0.16 inches (4 mm) narrower, 0.043 inches (1.1 mm) thinner, and 1.1 ounces (30 g) lighter than the previous Kindle 7, and features double the RAM (512MB) of its predecessor. The Kindle 8 is the first Kindle to use Bluetooth that can support VoiceView screen reader software for the visually impaired. It has the same screen display as its predecessor, a 167 ppi E Ink Pearl touch-screen display, and Amazon claims it has a four-week battery life and can be fully charged within four hours.
Kindle Oasis (second generation)
Amazon released the second-generation Kindle Oasis, marketed as the "All-New Kindle Oasis" and colloquially referred to as the Oasis 2, on October 31, 2017. It is available in 8 GB Wi-Fi, 32 GB Wi-FI and 32 GB Wi-Fi + 3G ($350 no ads) models with a 7-inch E Ink display with 300 ppi. It has an asymmetric design like the first-generation Oasis, so it works for one-handed use, and the device finish is made from aluminum. The device has a black front, with either a silver or gold colored back. The Oasis 2 is the first Kindle to be IPX8 rated so it is water-resistant up to two meters for up to 60 minutes, and first to be able to change the background black and the text to white. It is front-lit with 12 LEDs, and has ambient light sensors to adjust the screen brightness automatically. It supports playback of Audible audiobooks by pairing with A2DP supported external Bluetooth 4.2 speakers or headphones; the device can store up to 35 audiobooks with 8 GB or 160 audiobooks with the 32 GB model. The Oasis 2's internal battery lasts about six weeks of reading at 30 minutes a day.
The Verge gave the Oasis 2 a score of 8 of 10, praising its design, display, and water resistance, but criticizing its high cost and inability to read an e-book while its related audiobook is playing. Techradar rated it as 4.5 of 5, saying the Oasis 2 is expensive but it praises as the best e-reader at the time with its lovely metal design, waterproofing and great reading experience.
Kindle Paperwhite (fourth generation)
Amazon announced the fourth-generation Kindle Paperwhite on October 16, 2018 and released it on November 7, 2018; it is colloquially referred to as the Paperwhite 4 and Paperwhite 2018. It is available in 8 GB Wi-Fi, 32 GB Wi-Fi and 32 GB Wi-Fi + 4G LTE models. It features a 6-inch plastic-backed display of Amazon's own design with 300 ppi and a flush screen featuring five LED lights. It is waterproof with an IPX8 rating, allowing submersion in 2 meters of fresh water for up to one hour. It supports playback of Audible audio books only by pairing with external Bluetooth speakers or headphones.
Kindle (10th generation)
Amazon announced the Kindle (10th generation) on March 20, 2019, which features the first front light available on a basic Kindle. The front light uses 4 LEDs compared to the Paperwhite with 5 LEDs. Kindle 10 uses a 6-inch display with higher contrast than previous basic Kindles and has the same 167 ppi resolution. It has black and white colors.
Kindle Oasis (third generation)
Amazon released the third-generation Kindle Oasis, colloquially referred to as the Oasis 3, on July 24, 2019. Externally it is nearly identical in appearance to the second-generation Oasis, with a similar 7-inch, 300ppi E Ink display, adjustable warm light, one-handed design, waterproofing, aluminum exterior, Bluetooth support and Micro USB for charging. It adds a 25 LED front light that can adjust color temperature to warmer tones, the first Kindle to be able to do so. This device is available in two different colors; Graphite or Champagne Gold.
The Verge gave the Oasis 3 an 8 of 10 rating, praising its design, display, and warmer E Ink display, but criticizing its high cost, no USB-C support and the lackluster update over the 2017 model.
|Kindle||1||November 19, 2007||$399||6-inch (152 mm), 600 × 800 pixels, 167 PPI density, 4-level grayscale||Marvell Xscale PXA255 400 MHz, ARM9||64 MB||256/180 MB||Speakers||USB 2.0 port, SD card, 3.5 mm headphone jack||Keyboard, Scrollwheel||Amazon Whispernet||1,530 mAh||8.0 in (203 mm) H
5.3 in (135 mm) W
0.8 in (20 mm) D
|10.2 oz (290 g)||No|
|Kindle 2||2||February 23, 2009||$299||6-inch (152 mm), 600 × 800 pixels, 167 PPI density, 16-level grayscale||Freescale i.MX31 532 MHz, ARM11||32 MB||2/1.4 GB||USB 2.0 port, 3.5 mm headphone jack||Keyboard, D-pad||8.0 in (203 mm) H|
5.3 in (135 mm) W
0.36 in (9 mm) D
|Kindle 2 International||October 19, 2009||$279|
|Kindle DX||June 10, 2009||$489||128 MB||4/3 GB||10.4 in (264 mm) H
7.2 in (183 mm) W
0.38 in (10 mm) D
|18.9 oz (540 g)|
|Kindle DX International||January 6, 2010||?|
|Kindle DX Graphite||July 1, 2010||?|
|Kindle Keyboard||3||August 27, 2010||Wi-Fi: $139
|Freescale i.MX35 532 MHz, ARM11||256 MB||Amazon Whispernet (3G model only), 802.11bg Wi-Fi||1,750 mAh||7.5 in (191 mm) H
4.8 in (122 mm) W
0.34 in (9 mm) D
|Wi-Fi: 8.5 oz (241 g)3G: 8.7 oz (247 g)|
|Kindle 4||4||September 28, 2011||No ads: $109
|Freescale i.MX508 800 MHz||2/1.25 GB||USB 2.0 port||D-pad||Amazon Whispernet (3G model only), 802.11bgn Wi-Fi||890 mAh||6.5 in (165 mm) H
4.5 in (114 mm) W
0.34 in (9 mm) D
|5.98 oz (170 g)|
|Kindle Touch||November 15, 2011||No ads:
|4/3 GB||Speakers||USB 2.0 port, 3.5 mm headphone jack||Touchscreen||1,420 mAh||6.8 in (173 mm) H
4.7 in (119 mm) W
0.40 in (10 mm) D
|Wi-Fi: 7.5 oz (213 g)3G: 7.8 oz (220 g)|
|Kindle 5||5||September 6, 2012||No ads: $90
|2/1.25 GB||USB 2.0 port||D-pad||890 mAh||6.5 in (165 mm) H
4.5 in (114 mm) W
0.34 in (9 mm) D
|5.98 oz (170 g)|
|Kindle Paperwhite||October 1, 2012||No ads:
|6-inch, 768 × 1024 pixels, 212 PPI density, 16-level grayscale, LED frontlit||Touchscreen||1,470 mAh||6.7 in (170 mm) H
4.6 in (117 mm) W
0.36 in (9 mm) D
|Wi-Fi: 7.5 oz (213 g)3G: 7.8 oz (222 g)|
|Kindle Paperwhite 2||6||Wi-Fi: September 30, 2013
3G: November 5, 2013
|Freescale/NXP i.MX6 SoloLite 1 GHz||Wi-Fi: 7.3 oz (206 g)3G: 7.6 oz (215 g)|
|Kindle 7||7||October 2, 2014||No ads: $100
|6-inch (152 mm), 600 × 800 pixels, 167 PPI density, 16-level grayscale||4/3 GB||890 mAh||6.7 in (170 mm) H
4.7 in (119 mm) W
0.40 in (10 mm) D
|6.7 oz (191 g)|
|Kindle Voyage||November 4, 2014||No ads:
|6-inch, 1072 × 1448 pixels, 300 PPI density, 16-level grayscale, LED frontlit||512 MB||1,320 mAh||6.4 in (163 mm) H
4.5 in (114 mm) W
0.30 in (8 mm) D
|Wi-Fi: 6.3 oz (180 g)3G: 6.6 oz (188 g)|
|Kindle Paperwhite 3||June 30, 2015||No ads:
|6.7 in (170 mm) H
4.6 in (117 mm) W
0.36 in (9 mm) D
|Wi-Fi: 7.2 oz (205 g)3G: 7.7 oz (217 g)|
|Kindle Oasis||8||April 27, 2016||$289.99 – $379.99||Amazon Whispernet (3G model only), 802.11bgn Wi-Fi, Bluetooth||245 mAh (no cover)
1,535 mAh (with cover)
|5.6 in (142 mm) H
4.8 in (122 mm) W
0.13 in (3 mm) D (without cover)
0.33 in (8 mm) D (with cover)
|Wi-Fi: 4.6 oz (131 g)3G: 4.7 oz (133 g)Cover only: 3.8 oz (107 g)|
|Kindle 8||June 22, 2016||No ads: $100
|6-inch (152 mm), 600 × 800 pixels, 167 PPI density, 16-level grayscale||890 mAh||6.3 in (160 mm) H
4.5 in (114 mm) W
0.36 in (9 mm) D
|5.7 oz (161 g)|
|Kindle Oasis 2||9||October 31, 2017||$249.99 – $349.99||7-inch, 1680 × 1264 pixels, 300 PPI density, 16-level grayscale, LED frontlit||NXP i.MX7D 1 GHz||8/6 GB or 32/30 GB||1,000 mAh||6.3 in (160 mm) H
5.6 in (142 mm) W
0.33 in (8 mm) D
|6.8 oz (194 g)||IPX8|
|Kindle Paperwhite 4||10||November 7, 2018||$129.99+||6-inch, 1072 × 1448 pixels, 300 PPI density, 16-level grayscale, LED frontlit||Freescale/NXP i.MX6 SoloLite 1 GHz||1,500 mAh||6.6 in (168 mm) H
4.6 in (117 mm) W
0.32 in (8 mm) D
|Wi-Fi: 6.4 oz (182 g)3G: 6.7 oz (191 g)|
|Kindle 10||April 10, 2019||No ads: $109.99
|6-inch (152 mm), 600 × 800 pixels, 167 PPI density, 16-level grayscale, LED frontlit||8/6 GB||6.3 in (160 mm) H
4.5 in (114 mm) W
0.34 in (9 mm) D
|6.1 oz (174 g)||No|
|Kindle Oasis 3||July 24, 2019||$249.99 – $349.99||7-inch, 1680 × 1264 pixels, 300 PPI density, 16-level grayscale, LED frontlit||NXP i.MX7D 1 GHz||8/6 GB or 32/30 GB||1,130 mAh||6.3 in (160 mm) H
5.6 in (142 mm) W
0.33 in (8 mm) D
|6.6 oz (188 g)||IPX8|
With the release of the Kindle Paperwhite in 2012, Amazon released a natural leather cover and a plastic back that is form-fitted for the device that weighs 5.6 ounces. The cover closes book-like from the left edge. The cover has magnets that activate the sleep/wake function in the Kindle when the cover is either closed or opened. The subsequent Amazon covers include this function.
With the release of the Voyage in 2014, Amazon released two covers with either a polyurethane or a leather cover. The Voyage attaches to the rear of the Protective Cover magnetically and the case's cover folds over the top, and the case weighs 4.6 ounces. The case can fold into a stand, propping the Kindle up for hands-free reading. With the release of the Paperwhite (4th gen) in 2018, Amazon released three versions of its cover: a water-safe fabric cover that can withstand brief exposure to water, a standard leather cover and a premium leather cover; these covers all weigh 4 ounces.
In May 2016, Amazon released the official Kindle Audio Adapter for reading e-books aloud via a text-to-speech (TTS) system for the blind and visually impaired. This accessibility accessory, initially supported only for the Paperwhite 3 and Oasis, plugs in the USB port and connects to headphones or speakers. Once connected, the reader uses the Voiceview for Kindle feature to navigate the interface and listen to e-books via TTS. This feature only supports e-books, not audiobooks or music.
Using the accessory reduces the Paperwhite 3's battery life to six hours. As an alternative to the official adapter, a generic USB to audio converter will also work with Voiceview.
Kindle devices support dictionary and Wikipedia look-up functions when highlighting a word in an e-book. The font type, size and margins can be customized. Kindles are charged by connecting to a computer's USB port or to an AC adapter. Users needing accessibility due to impaired vision can use an audio adapter to listen to any e-book read aloud on supported Kindles, or those with difficulty in reading text may use the Amazon Ember Bold font for darker text and other fonts may too have bold font versions.
The Kindle also contains experimental features such a web browser that uses NetFront based on WebKit. The browser can freely access the Kindle Store and Wikipedia on 3G models while the browser may be limited to 50MB of data per month to websites other than Amazon and Wikipedia, Other possible experimental features, depending on the model are a Text-to-Speech engine that can read the text from ebooks and an MP3 player that can be used to play music while reading.
The Kindle's operating system updates are designed to be received wirelessly and installed automatically during a period in sleep mode in which Wi-Fi is turned on. A user may install firmware updates manually by downloading the firmware for their device and copying the file to the device's root directory. The Kindle operating system uses the Linux kernel with a Java app for reading e-books.
Amazon offers an email-based service called "Send-to-Kindle" that allows the user to send HTML pages, Microsoft Word documents, GIF, PNG, and BMP graphics directly to the user's Kindle library at Amazon. Sending the file is free if downloaded using Wi-Fi or $0.15 per MB when using a Kindle's 3G service. When Amazon receives the file, it converts the file to Kindle format and stores it in the user's online library (called "Your Content" by Amazon). In addition to the document types mentioned above, this service can be used to send unprotected MOBI files to a user's Kindle library. The Send-to-Kindle service's personal documents can be accessed by all Kindle hardware devices as well as iOS and Android devices using the Kindle app.
Format support by device
The first Kindle could read unprotected Mobipocket files (MOBI, PRC), plain text files (TXT), Topaz format books (TPZ) and Amazon's AZW format.
The Kindle 2 added native PDF capability with the version 2.3 firmware upgrade. The Kindle 1 could not read PDF files, but Amazon provides experimental conversion to the native AZW format, with the caveat that not all PDFs may format correctly. The Kindle 2 added the ability to play the Audible Enhanced (AAX) format. The Kindle 2 can also display HTML files.
The fourth and later generation Kindles, Touch, Paperwhite (all generations), Voyage and Oasis (all generations) can display AZW, AZW3, TXT, PDF, unprotected MOBI, and PRC files natively. HTML, DOC, DOCX, JPEG, GIF, PNG, and BMP are usable through Amazon's conversion service. The Keyboard, Touch, Oasis 2 & 3, Kindle 8 & 9, and Paperwhite 4 can also play Audible Enhanced (AA, AAX). The Kindle (7, 8 & 9), Kindle Paperwhite (2, 3 & 4), Voyage and Oasis (1, 2 & 3) can display KFX files natively. KFX is Amazon's successor to the AZW3 format.
Kindles cannot natively display EPUB files. However, at least two methods allow viewing the content of EPUB formatted content on Kindles:
- Specialized software like Calibre allows EPUB or some other unsupported files to be converted to one of the supported file formats.
- Kindles can be jailbroken to allow third-party software, such as KOReader which does support EPUB, to be installed.
Multiple devices and organization
An e-book may be downloaded from Amazon to several devices at the same time, as long as the devices are registered to the same Amazon account. A sharing limit typically ranges from one to six devices, depending on an undisclosed number of licenses set by the publisher. When a limit is reached, the user must remove the e-book from some device or unregister a device containing the e-book in order to add the e-book to another device.
The original Kindle and Kindle 2 did not allow the user to organize books into folders. The user could only select what type of content to display on the home screen and whether to organize by author, title, or download date. Kindle software version 2.5 allowed for the organization of books into "Collections" which behave like non-structured tags/labels: a collection can not include other collections, and one book may be added to multiple collections. These collections are normally set and organized on the Kindle itself, one book at a time. The set of all collections of a first Kindle device can be imported to a second Kindle device that is connected to the cloud and is registered to the same user; as the result of this operation, the documents that are on the second device now become organized according to the first device's collections. There is no option to organize by series or series order, as the AZW format does not possess the necessary metadata fields.
X-Ray is a reference tool that is incorporated in Kindle Touch and later devices, the Fire tablets, the Kindle app for mobile platforms and Fire TV. X-Ray lets users explore in more depth the contents of a book, by accessing pre-loaded files with relevant information, such as the most common characters, locations, themes, or ideas.
Users can bookmark, highlight, and search through content. Pages can be bookmarked for reference, and notes can be added to relevant content. While a book is open on the display, menu options allow users to search for synonyms and definitions from the built-in dictionary. The device also remembers the last page read for each book. Pages can be saved as a "clipping", or a text file containing the text of the currently displayed page. All clippings are appended to a single file, which can be downloaded over a USB cable. Due to the TXT format of the clippings file, all formatting (such as bold, italics, bigger fonts for headlines, etc.) is stripped off the original text.
On July 18, 2011, Amazon began a program that allows college students to rent Kindle textbooks from three different publishers for a fixed period of time.
Collection of user reading data
Kindle devices may report information about their users' reading data that includes the last page read, how long each e-book was opened, annotations, bookmarks, notes, highlights, or similar markings to Amazon. The Kindle stores this information on all Amazon e-books but it is unclear if this data is stored for non-Amazon e-books. There is a lack of e-reader data privacy — Amazon knows the user's identity, what the user is reading, whether the user has finished the book, what page the user is on, how long the user has spent on each page, and which passages the user may have highlighted.
Content from Amazon's Kindle Store is encoded in Amazon's proprietary Kindle formats (.azw, .kf8 and .kfx). In addition to published content, Kindle users can also access the Internet using the experimental web browser, which uses NetFront. Users can use the Kindle Store to access reading material using the Kindle itself or through a web browser to access content. The store features Kindle Unlimited for unlimited access to over one million e-books for a monthly fee.
Content for the Kindle can be purchased online and downloaded wirelessly in some countries, using either standard Wi-Fi or Amazon's 3G "Whispernet" network. Whispernet is accessible without any monthly fees or a subscription, although fees can be incurred for the delivery of periodicals and other content when roaming internationally beyond the customer's home country. Through a service called "Whispersync," customers can synchronize reading progress, bookmarks, and other information across Kindle hardware and other mobile devices.
For U.S. customers traveling abroad, Amazon originally charged a $1.99 fee to download e-books over 3G while overseas, but later removed the fee. Fees remain for wireless 3G delivery of periodical subscriptions and personal documents, while Wi-Fi delivery has no extra charge.
In addition to the Kindle Store, content for the Kindle can be purchased from various independent sources such as Fictionwise and Baen Ebooks. Public domain titles are also obtainable for the Kindle via content providers such as Project Gutenberg, The Internet Archive and the World Public Library. In 2011, the Kindle Store had more than twice as much paid content as its nearest competitor, Barnes & Noble.
Public libraries that offer books via OverDrive, Inc. also lend titles for the Kindle and Kindle reading apps in the US. Books are checked out from the library's own site, which forwards to Amazon for the completion of the checkout process. Amazon then delivers the title to the Kindle for the duration of the loan, though some titles may require transfer via a USB connection to a computer. If the book is later checked out again or purchased, annotations and bookmarks are preserved.
Kindle applications for reading on other devices
Amazon released the Kindle for PC application in late 2009, available for Microsoft Windows systems. This application allows ebooks from Amazon's store or personal ebooks to be read on a personal computer, with no Kindle device required. Amazon released a Kindle for Mac app for Apple Macintosh & OS X systems in early 2010. In June 2010, Amazon released the Amazon Kindle for Android. Soon after the Android release, versions for the Apple iOS (iPhone and iPad) and BlackBerry OS phones were available. In January 2011, Amazon released Kindle for Windows Phone. In July 2011, Kindle for HP TouchPad (running webOS) was released in the U.S. as a beta version. In August 2011, Amazon released an HTML5-based webapp for supported web browsers called Kindle Cloud Reader. In 2013, Amazon has expressed no interest in releasing a separate Kindle application for Linux systems; the Cloud Reader can be used on supported browsers in Linux.
On April 17, 2014, Samsung announced it would discontinue its own e-book store effective July 1, 2014 and it partnered with Amazon to create the Kindle for Samsung app optimized for display on Samsung Galaxy devices. The app uses Amazon's e-book store and it includes a monthly limited selection of free e-books.
On June 2016, Amazon released the Page Flip feature to its Kindle applications that debuted on its e-readers a few years previously. This feature allows the user to flip through nine thumbnails of page images at a time.
Kindle Direct Publishing
Concurrently with the release of the first Kindle device, Amazon launched Kindle Direct Publishing, used by authors and publishers to independently publish their books directly to Kindle and Kindle Apps worldwide. Authors can upload documents in several formats for delivery via Whispernet and charge between $0.99 and $200.00 per download.
In a December 5, 2009 interview with The New York Times, Amazon CEO Jeff Bezos revealed that Amazon keeps 65% of the revenue from all e-book sales for the Kindle; the remaining 35% is split between the book author and publisher. After numerous commentators observed that Apple's popular App Store offers 70% of royalties to the publisher, Amazon began a program that offers 70% royalties to Kindle publishers who agree to certain conditions. Some of these conditions, such as the inability to opt out of the lendability feature, have caused some controversy.
Kindle Development Kit
On January 21, 2010, Amazon announced the release of its Kindle Development Kit (KDK). KDK aims to allow developers to build "active content" for the Kindle, and a beta version was announced with a February 2010 release date. A number of companies have already experimented with delivering active content through the Kindle's bundled browser, and the KDK gives sample code, documentation and a Kindle Simulator together with a new revenue sharing model for developers. The KDK is based on the Java programming language's Personal Basis Profile packaged Java APIs.
As of May 2014[update] Kindle store offered over 400 items labeled as active content. These items include simple applications and games, including a free set provided by Amazon Digital Services. As of 2014, active content is only available to users with a U.S. billing address.
In October 2014, Amazon announced that the Voyage and future e-readers would not support active content because most users prefer to use apps on their smartphones and tablets, but the Paperwhite first-generation and earlier Kindles would continue to support active content.
Specific Kindle device sales numbers are not released by Amazon; however, according to anonymous inside sources, over three million Kindles had been sold as of December 2009, while external estimates, as of Q4-2009, place the number at about 1.5 million. According to James McQuivey of Forrester Research, estimates are ranging around four million, as of mid-2010.
In 2010, Amazon remained the undisputed leader in the e-reader category, accounting for 59% of e-readers shipped, and it gained 14 percentage points in share. According to an International Data Corporation (IDC) study from March 2011, sales for all e-book readers worldwide reached 12.8 million in 2010; 48% of them were Kindles. In the last three months of 2010, Amazon announced that in the United States its e-book sales had surpassed sales of paperback books for the first time.
In January 2011, Amazon announced that digital books were outselling their traditional print counterparts for the first time ever on its site, with an average of 115 Kindle editions being sold for every 100 paperback editions. In December 2011, Amazon announced that customers had purchased "well over" one million Kindles per week since the end of November 2011; this includes all available Kindle models and also the Kindle Fire tablet. IDC estimated that the Kindle Fire sold about 4.7 million units during the fourth quarter of 2011. Pacific Crest estimated that the Kindle Fire models sold six million units during Q4 2012.
Working Kindles in good condition can be sold, traded, donated or recycled in the aftermarket. Due to some Kindle devices being limited to use as reading device and the hassle of reselling Kindles, some people choose to donate their Kindle to schools, developing countries, literacy organizations, or charities. "The Kindle Classroom Project" promotes reading by distributing donated Kindles to schools in need. Worldreader and ‘’Develop Africa’’ ships donated e-readers to schools in developing countries in Africa for educational use. "Project Hart" may take donations of e-readers that could be given to people in need.
Whether in good condition or not, Kindles should not be disposed of in normal waste due to the device's electronic ink components and batteries. Instead, Kindles at the end of their useful life should be recycled. In the United States, Amazon runs their own program, 'Take Back', which allows owners to print out a prepaid shipping label, which can be used to return the device for disposal.
On July 17, 2009, Amazon withdrew from sale two e-books by George Orwell, Animal Farm and Nineteen Eighty-Four, refunding the purchase price to those who had bought them, and remotely deleted these titles from purchasers' devices without warning using a backdoor after discovering that the publisher lacked rights to publish these books. The two books were protected by copyright in the United States, but they were in the public domain in some other countries. Notes and annotations for the books made by users on their devices were left in a separate file but "rendered useless" without the content to which they were directly linked. The move prompted outcry and comparisons to Nineteen Eighty-Four itself: in the novel, books, magazines, and newspapers in public archives that contradict the ruling party are either edited long after being published or destroyed oufloat_right; the removed materials go "down the memory hole", the nickname for an incinerator chute used in 1984. Customers and commentators noted the resemblance to the censorship in the novel, and described Amazon's action in Orwellian terms. Ars Technica argued that the deletion violated the Kindle's terms of service, which stated in part:
Upon your payment of the applicable fees set by Amazon, Amazon grants you the non-exclusive right to keep a permanent copy of the applicable Digital Content and to view, use and display such Digital Content an unlimited number of times, solely on the Device or as authorized by Amazon as part of the Service and solely for your personal, non-commercial use.
Amazon spokesman Drew Herdener said that the company is "changing our systems so that in the future we will not remove books from customers' devices in these circumstances." On July 23, 2009, Amazon CEO Jeff Bezos posted on Amazon's official Kindle forum an apology about the company's handling of the matter. Bezos said the action was "stupid", and that the executives at Amazon "deserve the criticism received".
On July 30, 2009, Justin Gawronski, a Michigan high school senior, and Antoine Bruguier, a California engineer, filed suit against Amazon in the United States District Court for the Western District of Washington. Bruguier argued that Amazon had violated its terms of service by remotely deleting the copy of Nineteen Eighty-Four he purchased, in the process preventing him from accessing annotations he had written. Gawronski's copy of the e-book was also deleted without his consent, and found Amazon used deceit in an email exchange. The complaint, which sought class-action status, asked for both monetary and injunctive relief. The case was settled on September 25, 2009, with Amazon agreeing to pay $150,000 divided between the two plaintiffs, on the understanding that the law firm representing them, Kamber Edelson, "will donate its portion of that fee to a charitable organization". In the settlement, Amazon also provided wider rights to Kindle owners over its e-books:
For copies of Works purchased pursuant to TOS granting "the non-exclusive right to keep a permanent copy" of each purchased Work and to "view, use and display [such Works] an unlimited number of times, solely on the [Devices]... and solely for [the purchasers'] personal, non-commercial use", Amazon will not remotely delete or modify such Works from Devices purchased and being used in the U.S unless (a) the user consents to such deletion or modification; (b) the user requests a refund for the work or otherwise fails to pay for the work (e.g., if a credit card issuer declines payment); (c) a judicial or regulatory order requires such deletion or modification; or (d) deletion or modification is reasonably necessary to protect the consumer, the operation of a device or network used for communication (e.g., to remove harmful code embedded within an e-book on a device).
On September 4, 2009, Amazon offered all affected users a choice of restoring of the deleted e-books or receiving an Amazon gift certificate or check for $US30.
In December 2010, Amazon removed three e-books written by Selena Kitt, along with works by several other self-published erotic fiction authors, for "offensive" content regarding consensual incest that violated Amazon's publishing guidelines. Kitt stated her opinion this Amazon policy was selectively applied to some books but not others that feature similar themes. For what Amazon describes as "a brief period of time", the books were unavailable for redownload by users who had already purchased them. This ability was restored after it was brought to Amazon's attention; however, no remote deletion took place.
In October 2012, Amazon suspended the account of a Norwegian woman who purchased her Kindle in the United Kingdom, and the company deleted every e-book on her Kindle. Amazon claimed that she had violated their terms of service but did not specify what she had done wrong. After the woman contacted the media, Amazon restored her account and her purchased e-books.
Computer programmer Richard Stallman criticized the Kindle, citing Kindle terms of service which can censor users, which require the user's identification, and that can have a negative effect on independent book distributors; he also cited reported restrictions on Kindle users, as well the ability for Amazon to delete e-books and update software without the users' permission.
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