Observed arrival · 2026-09-12
Notch: a sound machine shaped around your ringing
An iPhone sound app lets users match the pitch they hear, remove that band from broadband sound, and listen offline.
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Field notes
Notch uses a three-stage pitch-matching flow: a rough range check, a closer match, and fine adjustment in 1/24-octave steps. Its sound engine is described as removing a half-octave band around the saved pitch, with the page reporting a 17–27 dB reduction in that band and less than 1 dB of change outside it. The planned app includes 19 sounds, three simultaneous layers, local storage, and timers lasting up to eight hours.
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