the Stamaurai app!

the Stamaurai app! Have you guys heard of the "Stamaurai" app? It's supposed to be a speech therapy app where it teaches you techniquoand practices to improve your stutter. I tried it and unbeknownst to me, it was a subscription based app. You have to pay before you get the full app experience. Are you guys familiar with this app and did you pay for it? It's $25 a month to my current understanding.