Frequency Match Lite

Changelog

• 2026-10-11Key detection fixed

What it is

Analyse a song in your browser: tempo, key and the notes it is made of.

The problem

Working out the notes, key and tempo of a song takes a trained ear and time.

How it works

1. 1Drop in an audio file or record 10 seconds; it never leaves your device
2. 2The Web Audio API extracts the frequency content
3. 3Pitch detection maps frequencies to notes
4. 4You get tempo (BPM), key, duration, a waveform, a chroma view and the top notes

Stack

Status + What's next

Live

Chords, and searching a whole library for songs that share a progression or melody.