Polychrome Computer
Sing a melody, detect the key, and get eight real chord voicings instantly.
Free - Free to use in browser; installable to home screen (PWA). No signup or paid tier listed.
About Polychrome Computer
Polychrome Computer is a compact, browser-based songwriting tool that listens to your sung or hummed melody, detects the key, and presents eight labeled chords (by scale degree) to help you build progressions. It offers multiple voicings (triads, sevenths, sus2/sus4, add9, first inversion, no third), transpose by semitone or octave, and works offline as an installable PWA. Audio is analyzed client-side in memory and discarded — no recordings are saved and the microphone is released when you switch away.
Key Features
- Real-time key detection from sung/hummed melody
- Displays 8 labeled chords (scale degrees) for writing progressions
- Multiple voicings: triads, sevenths, sus2/sus4, add9, inversions, no third
- Transpose by semitone and octave; reset voicings
- Client-side analysis with no recording saved; works offline as an installable PWA
Who is this for?
Songwriters, musicians, producers, music students and anyone sketching chord progressions.
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FreeFree to use in browser; installable to home screen (PWA). No signup or paid tier listed.
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