The tuner has got different modes. One of it is the pitch pipe. To switch between tuner and pitch pipe, use the ‘Mode’ button in the left corner.

The tuner is always in chromatic mode. So you can tune every other instrument like a zither, a Chapman Stick, a autoharp or piano.

Sometimes another app is using the microphone and blocks the access to the microphone for other apps. Please close this app or if it is not clear which app blocks the microphone, close them all. If this does not help, reboot your phone. nnIn rare cases it has to do with the permissions. The ‘audio record’ permission is needed for the tuner. Maybe the permission has been revoked. There isnthe possibility to withdraw permissions with Android 6 or higher. Please check: ‘Info’ -> ‘Permissions’ -> ‘Permissions’