 Unfortunately, you can't just rely on the app store and the number of stars that an app might have. You have to dig deeper. And in fact, you really need to go to the website of that app. Look to see if they've published any independent research showing that they're effective. Look to see who their founders are and if they're employing subject matter experts or therapists that actually know the literature and the research as part of their developmental staff. Those are really key components to ensuring that at least this app may have something to offer.