Spectrogram

Tap to start your microphone and watch the live spectrogram.

FFT size Frequency scale Min dB -90 Max dB -20

Idle — tap “Start mic” to begin.

Frequency runs bottom → top; time scrolls right → left, with brighter colours for louder energy. Whistle, hum or play music to draw glowing horizontal lines at each pitch. Narrow the Min/Max dB window to boost faint detail. Requires microphone permission and a secure HTTPS connection — nothing is recorded or sent anywhere; all analysis happens in your browser.