A free program for Android, by Roland Corporation.
The BOSS Tuner app is the most convenient way to tune your Android device with the world-renowned BOSS chromatic tuner. The app is designed to allow you to use the mic in your device to tune your guitar, bass, violin, cello, trumpet, and other instruments.
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In addition to supporting the standard frequencies for instruments, you can tune to the preferred frequencies for each instrument using the built-in D#-A# or A#-G# scales.
The BOSS Tuner app supports the same audio standards as the TU-3 / TU-3W pedal tuner, which means you can tune to the frequencies used in professional recording studios.