OxygenOS

Developer(s)	OnePlus
Initial release	March 2015
Stable release	OnePlus 10T: 11.C.23; OnePlus Nord 2T: 11.C.29; OnePlus Nord N20: 11.A.07; OnePlus 10R: 11.C.17; OnePlus Nord CE 2 Lite: 11.C.31; OnePlus 10 Pro: 11.C.25; OnePlus Nord CE 2: 11.C.10; OnePlus 9RT: 11.F.13; OnePlus Nord 2: 11.F.47; OnePlus Nord N200: 11.C.15; OnePlus Nord CE: 11.C.10; OnePlus 9R: 11.F.21; OnePlus 9 / 9 Pro: 11.F.20; OnePlus Nord N100: 11.0.8; OnePlus Nord N10: 11.0.7; OnePlus Nord: 11.F.21; OnePlus 8T: 11.F.15; OnePlus 8 / 8 Pro: 11.F.15; OnePlus 7 / 7T: 11.F.18; Discontinued: OnePlus 6 / 6T: 11.1.2.2; OnePlus 5 / 5T: 10.0.1; OnePlus 3 / 3T: 9.0.6; OnePlus 2: 3.6.1; OnePlus X: 3.1.4; OnePlus One: 2.1.4;
Written in	C++, Java
Operating system	Android (5.0.1 to 15.0)
Platform	Android
Available in	40 languages
	List of languages English (default), Malay, Catalan, Czech, Danish, German, Spanish, Filipino, French, Croatian, Italian, Hungarian, Dutch, Norwegian, Polish, Portuguese, Romanian, Slovak, Slovenian, Finnish, Swedish, Vietnamese, Turkish, Russian, Ukrainian, Hebrew, Urdu, Arabic, Marathi, Hindi, Bengali, Gujarati, Tamil, Telugu, Kannada, Thai, Japanese, Korean, Greek, Chinese
Type	Graphical user interface
License	Mixed (some Copyleft, some lax, some Proprietary licence)
Website	oneplus.com/oxygenos

OxygenOS (Chinese: 氧OS; pinyin: yǎng OS) is an Android-based operating system (OS) developed by Chinese smartphone manufacturer OnePlus exclusively for their smartphones. OxygenOS was developed for their overseas market. There used to also be another version of the OS designed specifically for the Chinese market called HydrogenOS (Chinese: 氢OS; pinyin: qīng OS).

In an interview published on 3 September 2016, XDA Developers revealed OnePlus was "actively merging both platforms (OxygenOS and HydrogenOS) into a single cohesive operating system based on Android".