You may use this app to magically turn your phone into a genuine guitar tuner. It's completely free, with musician-verified tuning accuracy.

To use, simply select the desired string by clicking on the button that corresponds to the string's primary note, then play the selected note repeatedly until the indicator goes green.

If you're encountering any errors, try these troubleshooting tips:

• Your microphone is likely being used by another application if this app cannot hear the notes you play. Try restarting your device and trying again after closing all background running programs (including this app).
• Make sure that your phone is close enough to your guitar for it to hear the notes played clearly and that all permissions have been granted.