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Pick a preset such as A440 or choose any note and octave, then press Play. Change the A4 reference if your band or orchestra tunes to 442 Hz or 432 Hz, use the fine-tune slider for cents, or type an exact frequency. Start with the volume low. Every tone fades in and out smoothly, the output is capped, and playback stops after five minutes or when you switch tabs.
A440 is the standard tuning pitch: the A above middle C vibrates at 440 Hz. Most instruments, tuners and recordings use it as the reference.
The volume is capped well below full scale and every tone fades in, so there is no loud start or click. Still start low, especially on headphones, and take breaks from pure tones.
Play the Low E preset (82.41 Hz) and tune the low E string until it matches without a slow wobble, then pick each other string’s note: A2, D3, G3, B3 and E4.
A432 sets the A slightly lower, about 32 cents flat of A440. There is no scientific evidence it sounds better, but some musicians prefer it. Use whatever your band or recording uses.
Small speakers and phones cannot reproduce very low frequencies, and hearing above about 15 kHz drops with age. Try headphones, or our Online Hearing Test to check your range.