[1] There used to also be another version of the OS designed specifically for the Chinese market called HydrogenOS (Chinese: 氢OS; pinyin: qīng OS).

[2] 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".

[3] OnePlus released a statement about data collection and analytics, claiming that the data is only used for system improvement and optimization, are not shared with third parties, and can be disabled by users in the system settings.

In July 2021, OnePlus merged OxygenOS with Oppo’s ColorOS.

Both companies’ software will remain separate and continue to serve their individual regions (OxygenOS for OnePlus phones globally, ColorOS on OnePlus and Oppo devices in China) but share a common codebase, which OnePlus says should standardize its software experience and streamline the development process for future OxygenOS updates.