Nice work! I am a believer in the "don't break the chain" notion used to motivate continuation of habits. As an aside, I've read a few accounts of Jerry Seinfe

Nice work! I am a believer in the "don't break the chain" notion used to motivate continuation of habits. As an aside, I've read a few accounts of Jerry Seinfeld recommended this technique when asked about productivity tips. For me, the idea mentioned by others of having a "skip a day" pass or something similar to the Duolingo system that allows one to "get out of jail free" is important. Since the goal of the app (I assume) is to help people form positive habits, users (especially paying customers) must be able to customize their experience.