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Cello Tuner
Press Start and bow one open string with the cello close to the microphone. Start with the A string, then D, G and C, using the fine tuners for small changes.
Sound is analysed on your device; nothing is recorded or uploaded.
Target · Waiting for a note
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Press Start and allow the microphone.
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Tap a string to hear its note and tune only that string. Switch back to Auto to let the tuner pick the string.
Pitch trace (centre line = in tune, ±50 cents)
Cello tunings
Every tuning the tuner knows, lowest string first, with each string’s frequency at A4 = 440 Hz.
| Tuning | Notes | Frequencies (Hz) |
|---|---|---|
| Cello (C G D A) | C2 G2 D3 A3 | 65.41 · 98.00 · 146.83 · 220.00 |
More tuners
Guitar tunings
Practising after tuning? Keep time with the online metronome.
About the Cello Tuner
Press Start and bow one open string with the cello close to the microphone. Start with the A string, then D, G and C, using the fine tuners for small changes.
How to use it
- 1 Press Start tuner and allow the microphone.
- 2 Pick your tuning, or keep Standard (E A D G B E).
- 3 Pluck one open string and let it ring: the tuner shows the string and a needle.
- 4 Tighten the string if it says tune up, loosen it if it says tune down, until the needle sits in the green and the string gets a tick.
Frequently asked questions
What are the cello string notes?
C2, G2, D3 and A3, from the lowest string: the same notes as a viola, one octave lower, a perfect fifth apart.
Why is the low C hard to tune?
It is a deep note that small microphones pick up weakly. Bow with a full, steady stroke close to the mic, or tune it by ear against the reference tone and the open G.
Is my audio recorded or uploaded?
No. The tuner analyses the sound from your microphone in your browser, a few times a second, and throws it away. Nothing is recorded, saved or sent to a server.
Why does the tuner jump between notes?
Usually because more than one string is ringing, the room is noisy, or the note has faded. Mute the other strings with your fretting hand, pluck firmly, and read the needle while the note is still strong. Moving closer to the microphone helps on laptops.
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