Polychrome Computer

What is Polychrome Computer?

Polychrome Computer is a songwriting tool to sing your melody, find the key, and work out real chords and voicings.

What Polychrome Computer does

The tool identifies the key from microphone input, presents eight chords labelled by scale degree, supports switching voicings, and transposes by semitone and octave without recording audio.

Who Polychrome Computer is for

People who sing or hum melodies and want to find keys and work out chord progressions for real songwriting.

How Polychrome Computer works

Users tap to sing or hum into the microphone, view the eight chords of that key, build a chord progression, and switch voicings or transpose notes.

Key features

• Identifies musical keys from sung or hummed melodies using microphone input.
• Displays eight labelled chords corresponding to scale degrees in the detected key.
• Provides alternative chord voicings including sevenths, sus2, sus4, add9, and first inversion.
• Supports transposing chords by semitone and octave.
• Audio is analysed frame by frame in memory and discarded as it goes without recording.
• Closes microphone input when switching tabs or opening another app.
• Installs to the home screen and works offline after the first load.

Facts from audiblegoods.com, checked 8 November 2026

• Analyses audio frame by frame in memory and discards it as it goes.
• Outputs eight chords labelled by scale degree.
• Closes audio input when switching tabs or opening another app.
• Works offline after first load and installs to device home screens.

Written from Polychrome Computer's own website (Homepage). The maker can claim this listing to edit it.