Computer

Using it

about a minute

1. Sing something

   Tap to start, then sing or hum a phrase. Hold each note for a moment; four or five distinct pitches is enough. The key guess appears live and firms up as you go.

2. Stop, and the grid fills

   Tap again to stop. The eight chords of that key appear, labelled by scale degree.

3. Find the ones that fit

   Sing the melody again and tap chords underneath it until something lands.

4. Correct it if the guess was off

   The dropdown holds the runner-up guess and the relative major or minor. Key up and down transposes by a semitone; octave up and down moves the chords into a comfortable range.

5. Open up a chord

   Shift the voicing, then tap a chord, for sevenths, sus2, sus4, add9, first inversion and no third. Tapping a row auditions it. Reset puts everything back to triads.

Nothing is recorded

Audio is analysed frame by frame in memory and discarded as it goes. The app holds a list of detected pitches and durations, and nothing else — there is no recording, no buffer kept, and nowhere for it to be sent.

When you stop, the microphone tracks are stopped too, so the browser's recording indicator goes dark rather than staying lit. Switching tabs or apps mid-take stops it as well, instead of holding the microphone open in the background.

The shape of it

No build step, no server, no accounts, and the only outside request is the webfont — if that fails, the type falls back to the system stack and everything still works.

It is laid out like a calculator, and it installs like one: add it to a home screen and it launches without browser chrome. The microphone needs a secure origin, so it wants HTTPS or localhost rather than a file opened from disk.

Specifications