Pure Sine Wave Tuning

When you’re tuning an instrument, the sound source matters. Many online tools rely on MIDI data or sampled tones that include overtones — and those can make it harder to lock in accurate pitch.

That’s why Hertz Piano uses pure sine waves.

Sine waves are the simplest, cleanest sound possible — a single frequency with no harmonics or coloration. This purity makes it much easier to identify beating, overtones, and micro-differences in tuning by ear.

Why It Matters

• Perfect for aural training: Hear precise intervals and beat frequencies clearly.

• Ideal for instrument setup: Whether you’re tuning a piano, guitar, or analog synth, sine waves give you the most stable frequency reference possible.

• No digital coloration: Since sine waves don’t rely on MIDI playback or sample libraries, you get a true mathematical tone every time.

For the purest tuning experience online, Hertz Piano delivers laboratory-grade accuracy in your browser.

Try it now: Tune by Ear with Hertz Piano