It still active, but still a small project, compared to graphene. Also graphene have better implementations like internet access as permission, as a quick example, play services sandboxing and segurity updates are implemented quickly. I choose calyx cuz having a setup I will use and also I haven’t used android in a while, at the time, so I didn’t want to break anything. Probably I made my election wrong, I mean calyx is a incredible project, but graphene looks better