Free tool · Tuners
Play a string and the needle shows if it is flat or sharp. Tap a string button to hear its reference note. It uses your microphone; nothing is recorded or sent.
Press start and play a string
Standard tuning, from the thickest string: G3 · D4 · A4 · E5. Press start, play one string at a time and let it ring. If the needle is left of center the string is flat: tighten it. Right of center is sharp: loosen it. Within 5 cents it turns green.
The tuner picks the nearest string on its own. To tune one string on purpose (for example a string that is far off), tap its button: it stays selected and plays the reference note. Tap it again to go back to automatic.
Other tuners: guitar tuner, ukulele tuner, bass tuner, chromatic tuner.
Roll a track made for you, free to listen to, with a license when you want to use it.