A simple and easy to use Guitar Tuner.
Start tuning from your lock screen with the Simple Tuner Widget
How to use:
1. Press the tuning fork button on screen.
2. Pluck a string on your instrument and Simple Tuner detects pitch to determine the note by the device microphone.
3. Tune your string so the tuning indicator is centered between the two triangles or at least within the green. The more center the indicator is, the better.