Tuner Guru — Precision Harmonic String Tuner & Lookahead Metronome

Tuner Guru helps cellists, guitarists, bassists, violinists, violists, and ukulele players tune accurately and configure practice tempos with minimal effort. Enter or speak a studio setup command—such as "Tune my cello", "Help me tune the A string", "Tune my guitar to Drop D", or "Set the metronome to 72 beats per minute".

Standard Concert Pitch Reference Chart (A4 = 440.0 Hz)

Cello (Standard Concert Pitch): C2 (65.41 Hz), G2 (98.00 Hz), D3 (146.83 Hz), A3 (220.00 Hz). Use tailpiece fine tuners for adjustments under 35 cents and friction pegs while bowing or plucking continuously for larger deviations.
6-String Guitar (Standard): Low E2 (82.41 Hz), A2 (110.00 Hz), D3 (146.83 Hz), G3 (196.00 Hz), B3 (246.94 Hz), High E4 (329.63 Hz). Guitar notation is written one octave above concert pitch.
Alternate Guitar Tunings: Drop D (D2 A2 D3 G3 B3 E4), Eb Half-Step Down (Eb2 Ab2 Db3 Gb3 Bb3 Eb4), DADGAD (D2 A2 D3 G3 A3 D4), and Open G (D2 G2 D3 G3 B3 D4).
4-String Bass Guitar (Standard): E1 (41.20 Hz), A1 (55.00 Hz), D2 (73.42 Hz), G2 (98.00 Hz).
Violin (Standard): G3 (196.00 Hz), D4 (293.66 Hz), A4 (440.00 Hz), E5 (659.26 Hz).
Viola (Standard): C3 (130.81 Hz), G3 (196.00 Hz), D4 (293.66 Hz), A4 (440.00 Hz).
Ukulele (Standard Soprano/Concert/Tenor): G4 (392.00 Hz), C4 (261.63 Hz), E4 (329.63 Hz), A4 (440.00 Hz).