Hear it · see it
🔊 Sound Lab
Play a note and see it two ways at once: the waveform in time and the frequency spectrum. Square and sawtooth waves reveal harmonics a pure sine never shows.
Waveform (time)
Spectrum (frequency)
A pure sine looks like one smooth wave and a single spike; square and saw waves add harmonics you can see as extra spikes. Low = bass, high = treble.