Find the
hidden tone.

Listen to a reference sine wave, tune your own frequency and see how closely your ears matched the pitch.

Three levelsChoose 10 Hz, 1 Hz or 0.1 Hz steps. Your progress is saved only in this browser and can be deleted at any time.

Choose a level

The hidden frequency and your controls use the same step size. Changing level starts a fresh tone.

ReferenceSINE · HIDDEN

???Hz

Listen as often as you need. The frequency is revealed only after you score the round.

Your tone80–1200 Hz

Your frequencyHz

80 HzStep 10 Hz1200 Hz

Scoring uses pitch distance in cents, so the same musical error receives the same score in every register.

Easy level

Saved only in this browser. No account, cloud sync, microphone recording or audio is stored.

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Find thehidden tone.