This is an area in which I have some experience (45 years clean). I've written a bunch of Recovery-assistive stuff, in my time, and continue to do so.
In my experience, if you are a true addict (as opposed to someone that has developed bad habits, but doesn't have the obsessive/compulsive disorder), then no app will work. It's a fart against a tornado. Those folks are a minority, though. I think most people could use this app.
But I feel as if everyone can benefit from self-discipline, and apps like this, work like fitness trackers. That can make major differences for many folks.
However, there's no "silver bullet." Self-Discipline is hard work. A lot of people want "easy solutions," and they don't really exist (except in fiction). Apps like this, simply help to focus and optimize that hard work.