Fire OS based on Android
Fire OS 5
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.Fire OS 6
Based on Android 7.1.2 "Nougat", its main changes and additions include:
Adoptable storage, allowing users to format and use their SD card as internal storage
Doze/App standby, aiming to improve battery life by forcing devices to sleep when not actively used, adding restrictions to apps that would normally continue to run background processesFire OS 7
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.Fire OS 8
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
derived from inspired by modeled after constructed from built upon