Cello Tuner

It plays a clean sine-wave reference tone for the note you choose. You play the same note on your cello and tune by ear until the beats between the two pitches disappear. It's how cellists tuned before microphones existed, and it's still the most accurate method for open strings.

Microphone tuners chase your pitch in real time, which trains you to look at a needle instead of listening. A reference tone trains your ear — you hear the interval, you hear the beats, and over time you stop needing the tuner at all.

A4 = 440 Hz, so the cello A string plays at 220 Hz (A3). If your ensemble or pianist tunes to a different A, this tuner won't match — that's the one place a microphone tuner with adjustable A is more flexible.

Play the tone, then bow your string. If you hear a wobble or beats, you're slightly off — tighten the peg if your note is flat, loosen if sharp. When the two pitches lock together with no beats, you're in tune.

Yes. Open the custom-note panel to pick any pitch in the cello range. Useful for checking your fourth-finger A on the D string against the open A, or for matching a specific note in a piece.

A pure sine wave has no overtones to confuse your ear, so the beats between your string and the reference are easy to hear. A cello sample sounds prettier but makes precise tuning harder.