Realme CEO Madhav Sheth confirmed that the company will offer its own RealmeOS in the coming months instead of Oppo's ColorOS. Not much is known about RealmeOS at this time apart from the fact that it will be based on Android Q and will incorporate features based on user feedback.
https://www.notebookcheck.net/Realme-to-soon-ditch-ColorOS-for-custom-RealmeOS-based-on-Android-Q.429957.0.html