I've found Anki useful for focusing piano practice. Each piece of music I have worked on over the years has a few tricky bars in it. Before Anki, I was really bad at remembering which bars I was bad at in each piece, and would tend to practice the bars I already know how to play, which is pleasant to do.

Today, I have one deck, which has a flashcard for each set of tricky bars from all the pieces I've worked on. Now when I sit down to practice the piano, I just load up that deck, and those bars are what I practice, and I grade myself on each flashcard to indicate how quickly I need to re-practise those particular tricky bars.

I've done this 5+ year now, and I'm impressed at how good the default algorithm seems to be at effectively ordering my piano practice sessions.