Mid range musical instruments chromatic tuner. Uses resonance for tuning.
The active frequency range is 60Hz to 620Hz so the app is not suitable for bass instruments.

You can use your phone or pad as a musical instrument tuner for quick and accurate tuning.
The device internal microphone is used for audio input and the instrument sound have to be louder than noises around it.
Chromatic tuner means that every notes are detected and displayed and the player needs to know which note he/she need to tune to.
Resonance Chromatic Tuner is very sensitive and fine accurate tuning can be achieved.

Notes are displayed on as a wheel rotating under the mark. If the note is on the right of the mark it means your tone is lower than needed. If the note is on the left of the mark then your tone is higher than needed. Detected frequency is displayed at the bottom centre.