Read it off the audio
The key is estimated from the harmony the chord engine heard, not from metadata that may be wrong.
Key detection
Before you can transpose a song you have to know what key it is in. The analysis works it out from the audio and prints it — “detected: A minor” — and that reading becomes the zero point every shift is counted from.
Download freeHow it works
See it beside the song
The detected key sits under the transpose slider, next to the key the song was written in.
Count shifts from there
Every semitone you move is measured from the detected key, so +2 always means the same thing.
What you get
- The detected key, printed and named
- A zero point for every transposition
- A key track that changes when the song does
Where it stops
A key is a statistical reading of a whole recording: a song that modulates, or one built on a modal loop, can be genuinely ambiguous. The detection names the most likely key, and the transpose control still lets you overrule it by ear.
Questions
What does “detected” mean?
It is the analysis’s answer, as opposed to a key you typed. Both are kept, so you can always see where the reading came from.
Does it work on minor keys?
Yes — major and minor are both reported, with the tonic named in the spelling the rest of the app uses.
What if the song changes key?
That is the key-change feature: the analysis marks the bar where the tonality moves.
Related
Key-change detection
When a song moves to a new key, the analysis finds the bar where the tonality changes and raises a gold flag on the chord track, with the new key written on it. The place your chart stopped making sense is the place you can see.
Lyrics when you want them
The lyric track runs under the chords and follows the same playhead, and any line you disagree with is yours to fix by hand.
Your language, built in
The whole interface is translated, and the menu names every language in itself — 日本語, 简体中文, Español — instead of making you read English to find yours.