|Written in||C (core), C++, Java (UI)|
|OS family||Unix-like (Linux)|
|Source model||Based on the Android Open source project, with Proprietary software & Proprietary components|
|Marketing target||Budget/Low priced tablet market,|
Members of the Amazon Ecosystem
|Platforms||32-bit and 64-bit ARM|
|Kernel type||Monolithic (modified Linux kernel)|
|Userland||Bionic libc, mksh shell, native core utilities with a few from NetBSD|
|License||Proprietary EULA; based on Apache License 2.0|
Modified Linux kernel under GNU GPL v2
Fire OS is a mobile operating system based on the Android Open Source Project. It is developed by Amazon for their devices. Fire OS includes proprietary software, a customized user interface primarily centered on content consumption, and heavy ties to content available from Amazon's storefronts and services.
See also: Fire HD § Software
Amazon began referring to the Android derivative as Fire OS with its third iteration of Fire tablets. Unlike previous Fire models, whose operating system was described as "based on" Android, Fire OS 3.0 was described as "compatible with" Android.
Based on Android 5.1 "Lollipop", it added an updated interface. The home screen has a traditional application grid and pages for content types, as opposed to the previous carousel interface. It also introduced On Deck, a function that automatically moves content out of offline storage to maintain storage space for new content; the Word Runner speed reading tool; and screen color filters. Parental controls were enhanced with a new web browser for FreeTime mode featuring a curated selection of content appropriate for children, and an Activity Center for monitoring children's usage. It removed support for device encryption, which an Amazon spokesperson stated was an enterprise-oriented feature that was underused. In March 2016, after the removal was publicized and criticized in the wake of the FBI–Apple encryption dispute, Amazon announced it would restore the feature in a future patch.
Based on Android 7.1.2 "Nougat", its main changes and additions include:
In early 2019, security exploits for six Fire Tablet models and one Fire TV model were discovered that could allow temporary root access, permanent root access, and bootloader unlocking[note 1]  due to security vulnerabilities in multiple MediaTek chipsets.
Based on Android 9.0 "Pie", it was released in 2019 for all 8th-11th generation Fire tablets.
In February 2022, Amazon announced that the Docs app would be replaced (in August 2022) by document creation functionality in the Files app; and introduced an improved home editing system.
FireOS 8 is the latest release of FireOS for the 12th generation Fire 7, based on Android 11, information about the release became available via Amazon developer documentation around May 2022.
FireOS 8 incorporates changes from Android 10 and Android 11, although it is noted in the Amazon developer documentation that some Android 11 features such as File Based Encryption (FBE) are not supported yet,
Some of the new changes in FireOS 8 include:
Note: new changes/features (e.g: changes for developers) may be excluded
Fire OS does not come with Google mobile services pre-installed, therefore Amazon cannot use the Android trademarks to market the devices. although users are able to sideload the Google Play store full compatibility is not guaranteed if the app depends on Google services.
Because Google services are not pre-installed, Amazon develops and uses its own apps in their place, some of which include Amazon Appstore, Amazon Alexa, Prime Video, Amazon Music, Audible, Kindle Store, Silk Browser and Here WeGo.
Fire OS uses a customized home screen (launcher), as of Fire OS 18.104.22.168 the launcher features 3 sections:
Fire OS provides integration with Goodreads, Facebook and Twitter. X-Ray is also integrated into its playback functions, allowing users to access supplemental information on what they are currently viewing. The OS features a user system,
Along with Amazon Kids and Amazon Kids+, a suite of parental controls is included which allow parents to set limits and restrictions for minors.
Current Amazon devices running Fire OS:
Discontinued devices running Fire OS:
See also: Fire HD § Models
|Fire OS version||Base Android Version||Android API level||Compatible Devices||Notes|
|1||2.3.3 Gingerbread||10||Kindle Fire||Reported as "Based on Android"|
|2||4.0 Ice Cream Sandwich||15||Kindle Fire HD||Reported "Based on Android"|
|3||4.2.2 Jellybean||17||Fire HD (2nd generation), Fire HDX||Reported as "Compatible with Android"|
|4||4.4.2 KitKat||19||Fire HD (3rd generation), Fire HDX (2nd generation)|
|5.0||5.1 Lollipop||22||Fire 7 (7th generation)|
|6||7.1.2 Nougat||25||Fire HD 8 (8th generation)|
|7||9.0 Pie||28||Fire HD 8/8+ (10 generation)
Fire HD 10/10+ (11 generation)
|8||11||30||Fire 7 (12th generation)
Fire HD 8 (12th Generation)
|Some Android 11 features such as File Based Encryption (FBE) are not supported in Fire OS 8 |
The releases are categorized by major Fire OS versions based upon a certain Android codebase first and then sorted chronologically.