Upload a track and get its chord progression laid out with timestamps, plus the key it is likely in. Tap any chord to jump straight to that moment in the song. Nothing is uploaded — it all runs in your browser.
How it works
Drag in an MP3 or other audio file. A studio recording, a demo, or a practice-room take all work — the clearer the harmony, the better the read.
The tool measures which notes are ringing at every moment and matches them to chord shapes. A three-minute song takes a few seconds.
You get the progression as a chord chart and a timeline. Tap any row to jump the player to that chord so you can loop the tricky bars.
Who uses it
Five situations where having the chords in front of you beats working them out by ear.
The situation: You love a song but there is no chord sheet online, or the ones you find are wrong.
What they do: Upload the track, get the progression with timestamps, and play along section by section.
The result: You are playing the real changes in minutes instead of guessing for an hour.
The situation: The band learned a song from a recording and everyone plays a slightly different version.
What they do: Run the recording through once and share the detected chords and key with the whole team.
The result: Everyone rehearses from the same progression and the arrangement finally locks in.
The situation: A song has a chord move you want to borrow but you cannot name it by ear.
What they do: Drop the track in, find the exact bar, and read the chord and the key it sits in.
The result: You understand the trick and can reuse it in your own writing.
The situation: A student brings in a song they want to learn and you need a chart before next week.
What they do: Analyze the audio, tidy any spots the detector was unsure about, and print a clean sheet.
The result: Lesson time goes to playing, not to transcribing on the spot.
The situation: The band wants a new cover ready for the weekend and nobody has time to chart it.
What they do: One person runs it through the detector and drops the progression into the shared setlist doc.
The result: The song is rehearsal-ready the same night.
FAQ
No. The audio is decoded and analysed entirely in your browser tab. Nothing is sent anywhere, so it is fine to use on unreleased demos.
On songs with clear harmony — piano, acoustic guitar, a straightforward band arrangement — it gets most chords right. Dense mixes, heavy distortion, and lots of key changes make it less reliable, so treat the result as a strong first draft.
Major, minor, dominant seventh, major seventh, minor seventh, diminished, and sus4. It labels the closest match, so a more exotic chord may come back as its nearest common shape.
"N.C." means no clear chord — usually an intro, a drum break, a solo line, or a passage too quiet or noisy to read. It is normal for parts of a song.
Yes. The result includes an audio player and a timeline. Tap any row and the song jumps to that chord so you can loop and check it.
Yes. It estimates the most likely major or minor key from the overall harmony and shows it above the progression.
There is no server limit. A full song is fine; longer files just take a little more time and memory. Trim to the part you need if your device is older.
Use the player to loop that part and compare. Detection is hardest during fast changes, key modulations, and busy mixes — those spots are where a quick manual check pays off.
Yes, in a modern mobile browser. Analysis is more demanding than a normal page, so a recent phone handles longer songs more comfortably.
Yes, completely, with no account and no limit on how many songs you analyse.