This appears to be a scam!
Downloaded after the App Store said it was compatible with my iPhone 11, and bought a weekly subscription. After the app opens, there’s a “Let’s get started” button. Click that and it goes to a blank screen with a rotating cursor, acting like it’s cogitating, and nothing happens. No options, no setup , no settings, and no sound boost! Unless they can prove to me to the contrary, I’m convinced it’s a fraud and a scam.