the app looks very nice, but offers almost no explanation about how it works.I created a dummy "this is a test" challenge, and there was (1) NO way to edit it; (2) NO way to cancel it, and (3) when I went to start a new challenge (only one allowed at a time), it wanted to charge me Real Money to start a new one because I had failed to complete the old one (which I had set up literally seconds before). I dunno how much; I don't care: any amount is inappropriate in that situation.I know why they would do these things: to really form a new habit, you have to commit, for real, and that means that the money, not editing, &c., make some sense. but that doesn't mean they should charge money in the first place, and much less that they can be excused for not making it clear at the outset. if you don't know what the stakes are, they can't motivate you.it's organized by days, which may or may not match what you need, and has a setting for when to remind you.but because you can't cancel, or edit,the challenge, what happens when you discover part way through that the challenge was inappropriate for you?put another way, I believe the only times that this app can be useful is when you're trying to habitualize something inconsequential. in other words, if it's a habit that actually means something to you, it's going to be hard. hard means that you have to expend effort to do it, and you get feedback from your effort. a lot of the time, this will mean pivoting, which this app doesn't allow.I don't think these issues can be resolved; they're baked into the basic structure that they've chosen.I think the creators of this app need to take a hard look at the literature on habit formation, think about the user experience, and restart from the ground up.I doubt there's anyone who can get a meaningful benefit from this app.