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Acoustic feedback detection, right in your browser

No install, no upload — find howling (feedback) frequencies from your mic or audio files, and hear a notch filter fix them instantly.

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Live mic RTA

See your mic as a real-time spectrogram with howls flagged instantly.

Region analysis

Analyze a whole region of an audio file with howls marked on the spectrogram.

Notch preview

Apply a notch filter, loop-listen to check the effect, and export as MP3.

100% local

Your audio is never uploaded — everything runs in your browser.