Initially, OnePlus relied on a partnership with Cyanogen, launching its first smartphone with CyanogenMod. But then there was a break in relations. Therefore, the company had to hire developers to present its Android-based user interface in 2015. For Chinese versions of smartphones, it was called HydrogenOS, and for global versions – OxygenOS.
But before finding a name, the company searched for the most successful naming before the OxygenOS variant was finally approved. The staff went through several other namings, including even the banal OnePlus ROM.