There is an excellent app for android called 'Loop - Habit Tracker' (https://play.google.com/store/apps/details?id=org.isoron.uhabits&hl=en https://play.google.

There is an excellent app for android called 'Loop - Habit Tracker' (https://play.google.com/store/apps/details?id=org.isoron.uhabits&hl=en https://play.google.com/store/apps/details?id=org.isoron.uha...) which has a really great interface for keeping track of habits. It's very well designed. The interface is simple and snappy. Best app I've found anywhere for keeping track of even small daily habits (like flossing). It takes about 3 seconds to check off a habit, it can remind you every day, and you can consult graphs to see how you've been doing. It's also free and has no ads. I didn't make this project. But it's great. I've picked up quite a few habits using it.