Upload a track (MP3/WAV) — get the key and the chord progression with timecodes. Everything runs in your browser, nothing is uploaded.
🎁 Got the chords — build a prompt for them The Chord Builder turns a progression into a ready block for Suno. Open →💡 Chord detection is approximate (major/minor triads). More accurate on clear harmony; a dense mix may cause errors.
Upload an MP3 or WAV and press Detect. The tool analyzes the harmony (chroma profile) and finds the key and the sequence of major/minor triad chords with timecodes. Everything runs in your browser — the audio never leaves your device.
Quickly lift chords from a reference, learn a song, prep a progression for a cover, or gather harmony for generation. Turn the progression into a ready prompt block in the Chord Builder.