This app is great for what it advertises. It has better control then the other whistle apps, and looks much more professional. Unlike everyone else, I didn’t get my phone wet or anything. I just was curious about whistle apps (lol). However, I would advise anyone suffering from chronic tinnitus (such as me) to be careful with this app. After using this app for a day, the buzzing wouldn’t stop. Ringing in the ears is normal for me, but the ringing became higher in frequency and louder as well. That’s pretty much the only improvement I can suggest/think of for this app. If there was a warning for Tinnitus I would give it a definite 5/5.