Free Online Guitar Tuner - Use your microphone to tune your Guitar
https://guitarapp.com/tuner.html
WebOnline Guitar Tuner is a free web based guitar tuner by GuitarApp. Tune your guitar using your laptop or phone microphone. Tuner for DADGAD, Drop D, Open D and many other tunings. This is an online tuner for guitar, bass, ukulele, mandolin, banjo, violin and cello.
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