Exclusive to Realme 3 Pro users
Realme just announced in their community forums the beta testing for Project X. While recruitment is already closed as of this writing, the post noted that those joining Project X must own a Realme 3 Pro, has knowledge in beta testing, and is proficient in English.
Realme did not divulge what is Project X is all about. There are two possibilities, one being a ColorOS version of Android Q, as the Realme 3 Pro is one of the few phones certified for Android Q beta testing. The other possibility is the rumored RealmeOS, which CEO Madhav Sheth has previously confirmed.
