This app was mentioned in 2 comments, with an average of 1.00 upvote
I like the free Android app Rhythm Teacher: Music beats. The game awards you points for tapping the correct rhythm, and you advance to the next higher level if you have achieved enough points. You start with one hand, and for harder levels proceed with both hands. It's useful for practicing your sight reading.
Ive been using this android ap
Its pretty good. I'm on level 32 right now, which is triplets. Some of the lessons have two lines (right hand, left hand). So, I've been skipping those.
I think the first 20 or so levels are free. I gave them my $10.