Studycat worked well for us too. You can add up to four learner profiles, and the progress tracking on the parent side is actually useful, not just badges. It also syncs across iOS and Android, so we switch devices without losing a profile. Worth trying the free trial to see if your kids like the games and songs.

I'm a solo and I use them. It's not overkill at all – they have plans for smaller firms. The peace of mind knowing every call is handled professionally is massive. Plus their intake notes are really thorough.