◂ THE LAB

LEVEL · SIGNAL SCAN

SPECTRUM

Watch sound as light. Load a track or open the mic to render a waveform and a scrolling FFT spectrogram — play, seek and read the frequency under your cursor.

100% in-browser No uploads Web Audio FFT

Source & controls

Pick an audio file or grab the microphone, then tune the scan.

Choose an audio file or start the microphone.
Live input
0:00 0:00

Waveform

Amplitude over time. The white playhead tracks the loaded track.

No source

Spectrogram

Frequency content scrolling right to left. Low pitch at the bottom, high at the top.

Cursor: -- Hz

FREQ ↑ Hover the scope to read the frequency at the cursor. TIME →