Tools
Guitar tuner
Guitar, ukulele and bass. Uses your microphone.
Tunings
Guitar: standard (EADGBE), half step down, drop D, drop C, open G, open D, DADGAD and open C. Ukulele: standard C with high or low G, D tuning and baritone. Bass: 4-string (EADG) and 5-string (BEADG). Let the tuner detect the string you play, or pick one string at a time and play its reference tone.