Favorite iOS habit tracker

The only habit tracker that I have consistently used and enjoy using is Tally: The Anything Tracker (iOS only). You can color code and group habits by type, set targets, track by day, week, month or year and have them reset whenever you want. You can track 3 habits with the free version and upgrade for more. There are a lot of other features too, but what I like the most about it is the cool, colored grid view and that I am able to add notes for the tallies I make. I am trying to read at least 20 books per year and I use the notes to track titles. I’ve been using this app for almost a year now and I like being able to see the historical data — like of my miles hiked per month — because it motivates me to outdo myself. — CD