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Spectrum Analyzer

Real-time frequency display from your microphone.

0 Hz~20 kHz

Real-time FFT of your microphone input. The horizontal axis is frequency (low to high), the vertical is loudness. Sing a steady note to see the fundamental and its harmonics line up.

About

Visualizes the FFT of your mic input in real time. Sing a steady note to see the fundamental and its harmonics. Helpful for finding where a room rings, or for showing kids what frequency means.

How to use

  1. Click Start and grant mic permission.
  2. Make some noise.
  3. Watch the bars.

FAQ

Why doesn't the high end show much?+

Most consumer mics roll off above 10-15 kHz, and most rooms have very little energy up there. The display goes to about 20 kHz but the top quarter is usually empty.