What are you using to keep your habits going right now — and what makes that one stick?

Hey all — I work on a small team building tools to help people keep up with habits and routines, so this is very much my kind of question.

Rather than sit here guessing, I'd rather hear what actually works for people:

1. What are you using right now, and what keeps you opening it?
2. What made that one stick when other things didn't?
3. Anything you tried and dropped? What's the last thing you remember doing in it?
4. Anything you wish existed?

Answer whichever one you feel like — one line is fine. "Downloaded it and never opened it again" counts too.

If you'd rather answer in more detail, I put these (and a few more) into a form — mostly multiple choice. Everyone who fills it out can enter a raffle for one of two $20 gift cards.