LESS FUSS. MORE MUSIC.
Cello Tuner
Tune your cello’s open C G D A strings in the browser. Play one steady note and follow the pitch indicator.
READY WHEN YOU ARE
Hz play a single note
Your next good note starts here.
Start the microphone, then play a single note.
Just you and your instrument. Audio stays on your device.
Pick your instrument
Use a preset or go chromatic.
Tap a note to tune a specific string.
Let it listen
Allow microphone access.
Play one clear note at a time.
Meet in the middle
Adjust until the marker turns green.
Flat? Tighten. Sharp? Loosen.
Cello tuning notes
Standard cello tuning is C2, G2, D3, A3 from lowest to highest, one octave below the viola’s open strings.
| Target | Note | Frequency |
|---|---|---|
| 1 | C2 | 65.41 Hz |
| 2 | G2 | 98.00 Hz |
| 3 | D3 | 146.83 Hz |
| 4 | A3 | 220.00 Hz |
Targets are listed in preset order. Frequencies above use A4 = 440 Hz; changing Reference A4 adjusts the live tuner targets.
How to tune your cello
Bow a steady open string or pluck and allow the pitch to settle. For the low C string, reduce background noise and place the microphone where it can hear the instrument clearly. Select a target to avoid following a harmonic.
Why might the tuner show a higher octave on a cello string?
A string produces harmonics above its fundamental pitch. Try a steadier, gentler note, mute other strings, and select the intended target. Check both the note and octave before adjusting tension.
What do flat, sharp, and cents mean?
Flat means your pitch is below the target; sharp means it is above it. A cent is one hundredth of a semitone. Move toward 0 cents using small adjustments. For strings, tighten to raise pitch and loosen to lower it.
Can I change the reference pitch?
Reference A4 defaults to 440 Hz and accepts 400–480 Hz. Match your ensemble’s reference before tuning. The selected preset keeps its note names while its target frequencies adjust.
Choose your instrument tuner
Open a dedicated tuner for your instrument, or share its link for your next practice session.