Well, short answer: it's not true. Practice can help. This app in particular has a lot of great nuance for various physical elements like tension and articulation that are really important to learn about. All good stuff and an important foundation for many. People seek speech therapy and/or use apps because they want to be fluent, or at least be *more* fluent. That sounds simple but it is often far more complex than even the person themselves realizes. Many people who seek therapy are actually pretty fluent already, a lot of the time...but there are some very particular, critical moments where the stuttering is incredibly painful to deal with. It's those crucial, struggle-filled moments that are the core of suffering. It's THOSE moments that need to change, for the person to feel they have reached the comfort and confidence that is associated with the word "fluency". This app says in the intro that practicing will help you be fluent "most of the time". That's probably safe to say. But it's not a random percentage "most". It's "most of the time, *except for* the times when you desperately want to be fluent." There's a whole mental and psychological, under-the-iceberg element to those moments, and speech exercises only scratch the surface at best. Overall I like this sort of app, it's a helpful tool. But the cheery "you'll be mostly fluent!" promises reaaalllly oversimplify and ignore the deep-rooted complexities of stuttering.