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OnKey: Mac app that shows where you sing off-key while singing along to songs

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A self-described poor singer built OnKey, a free, open-source Mac app to help improve pitch and timing. The app listens to a song playing on Spotify, Apple Music, or YouTube in the browser, learns its pitch track in a couple of minutes, and then lets the user sing along and see where they drift. The creator built it after a singing app began filling its catalog with non-original tracks, which made practicing harder. OnKey does not save the music or record the user's voice, though it does send a short audio fingerprint to look up song details and lyrics. The project is limited to Apple Silicon Macs running macOS 14.2 or later and still struggles with noisy backing tracks and occasional octave errors.

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OnKey: Mac app that shows where you sing off-key while singing along to songs · ShortSingh