Obvious vs Subtle Brand Naming

I'm creating an app where you can track habits with friends and keep each other accountable. I have two names in mind for it:
Circle - I like this as it sounds nice and re-enforces the group aspect of the app. But maybe it's a bit too vague as it could mean so many different things.
Pact - More obvious as to what the app does, but doesn't sound as nice, and is also more of a serious vibe which is not what we're necessarily going for.

Thoughts and feedback? Maybe even other name suggestions?