Support
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Before you write
The numbers look too high or too low. Phone microphones differ a lot between models. Open Settings → Calibration in the App and shift the offset until Hush agrees with a reference you trust. Remember that even after calibrating, the reading is an approximation.
Nothing happens when I press start. Check that microphone access is allowed for Hush in the iOS Settings app.
I subscribed but Premium is not active. Open the App, go to Settings and tap "Restore". Make sure you are signed in with the same Apple Account you bought it with.
I want to cancel. Open the App, go to Settings → "Manage or cancel subscription". That takes you straight to the Apple subscription screen.