|Initial release||March 2015|
|Written in||C++, Java|
|Operating system||Android (5.0.1 to 7.1.1)|
|Available in||English (default)|
|Type||Graphical user interface|
|License||Mixed (some open source, some closed source)|
OxygenOS (Chinese: 氧OS; pinyin: yǎng OS) is a customised version of Android operating system developed by Chinese smartphone manufacturer OnePlus exclusively for their smartphones. OxygenOS was developed for their overseas market. There is also another version of the OS designed specifically for the Chinese home market called HydrogenOS (Chinese: 氢OS; pinyin: qīng OS).
In an interview published 3 September 2016, XDA Developers revealed OnePlus was "actively merging both platforms (OxygenOS and HydrogenOS) into a single cohesive operating system".
Notable features of version 2.0 and 2.1.1 include app permissions, Waves MaxxAudio, SwiftKey keyboard, off-screen gestures, custom icons, dark mode, manual camera mode, and RAW support for 3rd party apps, like Camera FV-5 2.75.
On 31 December, 2016, OnePlus released OxygenOS 4.0.0 to the public via OTA download. It is based on Android Nougat and includes its features and several other modifications.
|OxygenOS Version||Android Version||Release Date||Supported OnePlus Devices||Notes|
|1.0 - 1.0.3||5.0.1 Lollipop||1.0.3: 2 September 2015||Yes||Only available as flashable ZIP on OnePlus website.
1.0.2 - 1.0.3 changelog:
|2.0 - 2.1.4||5.1.1 Lollipop||Yes||Yes||Yes|
|2.1.5 - 2.2.1||Yes||Yes|
|2.2.2 - 2.2.3||4 August - 28 September 2016||Yes||September Android Security Bulletin and necessary dependencies for Marshmallow upgrade.|
|3.0.2||6.0.1 Marshmallow||4 June 2016||Yes|
|3.1.4||10 November 2016||Yes|
|3.2.8||Yes||1080p 60fps videos|
|3.5.3||28 November 2016||Yes||Preinstalled firmware on OnePlus 3T devices sold outside China.|
|3.5.4||19 December 2016||Yes|
|3.5.5||24 December 2016||Yes|
|3.5.6||5 January 2017||Yes|
|3.5.8||12 April 2017||Yes||March 1, 2017 Android Security Patches.|
|3.5.9||5 July 2017||Yes||VoLTE Fixes.|
|3.6.0||10 July 2017||Yes||June 1, 2017 Android Security Patches, Turkey time zone updated. VoLTE fixes in India|
|4.0.0||7.0 Nougat||31 December 2016||Yes||Yes||Android 7.0 Nougat Upgrade|
|4.0.1||7 January 2017||Yes||Yes|
|4.0.2||14 January 2017||Yes||Yes|
|4.0.3||8 February 2017||Yes||Yes|
|4.1.0||7.1.1 Nougat||16 March 2017||Yes||Yes||Android 7.1.1 Nougat Upgrade|
|4.1.1||28 March 2017||Yes||Yes|
|4.1.3||17 April 2017||Yes||Yes|
|4.1.5||7 June 2017||Yes||Yes||May 1, 2017 Android Security Patches.|
|4.1.6||12 June 2017||Yes||Yes||Fixes from 4.1.5|
|4.5.0||20 June 2017||Yes||Preinstalled firmware on OnePlus 5 devices.|
|4.5.1||22 June 2017||Yes|
|4.5.2||25 June 2017||Yes|
|4.5.3||27 June 2017||Yes|
|4.5.4||28 June 2017||Yes|
|4.5.5||5 July 2017||Yes|
|4.5.6||20 July 2017||Yes||Fix for crash when calling emergency services.|
|4.5.7||1 August 2017||Yes||Added 'Slate' font, 4K video stabilization and bug fixes. Withdrawn, replaced by 4.5.8.|
|4.5.8||5 August 2017||Yes||Fix for gaming stutter issue.|
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