OnePlus phones ship with HydrogenOS in China and OxygenOS in the rest of the world. Starting with the OnePlus 9 series, OnePlus phones sold in China will ship with ColorOS.
The announcement was made today by Pete Lau on his Weibo page. The founder and CEO revealed that the OnePlus 9 series will have the ColorOS shell preinstalled in production.
ColorOS is Oppo’s skin for Android. The UI also shipped with Realme-branded phones for a while before they announced their own skin called realme UI. Interestingly, Realme, a younger brand than OnePlus, has ditched ColorOS, while OnePlus is moving away from its own UI in favor of ColorOS.

Pete Lau also added that previous devices running HydrogenOS will continue to receive updates. However, sources add? that OnePlus has no plans to upgrade its older devices from HydrogenOS to ColorOS.
OnePlus hasn’t said anything about the future of OxygenOS, so the company is expected to continue equipping OnePlus phones sold outside of China with this shell.
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