Lift
Simply maintain a list of tasks that you want to turn into a habit and tell the app when you want to be reminded to carry them out.
For example, I have a reminder to floss that goes off every night at 9 PM. And you know what? After a week or so of using the app, I no longer need the app to remind me.
The flossing reminder goes off and I've already done it.
What kinds of things would you like to make into habits?