About Chord Sequence
A free, no-account chord progression builder for songwriters, producers, and music students.
What is Chord Sequence?
Chord Sequence is a browser-based tool that lets you build, play, and export chord progressions — no signup, no subscription, no plugins. Open it in any browser and start making music in seconds.
It supports 37 chord types (major, minor, 7th, maj7, m7, dim, aug, sus, add9, and more), real-time transposition, BPM control, MIDI export, and a growing library of curated progressions across genres like pop, jazz, lo-fi, soul, and blues.
37 chord types
From simple triads to extended jazz voicings
MIDI export
Drag directly into your DAW
No account needed
Your progressions stay in your browser
Who built it
Musician & Software Developer
Elías Corsino Saldaña is a musician and software developer from the Dominican Republic. He started learning music at age 12 and plays piano, bass, guitar, and drums. He built Chord Sequence to combine his passion for music theory with his background in software engineering — making harmony tools accessible to every musician, regardless of experience.
Why is it free?
Music theory tools shouldn't cost money. The best way to learn harmony is to experiment — to try a chord, hear what it sounds like in context, and understand why it works. Paywalls kill that feedback loop.
Chord Sequence will always be free to use. There's no freemium tier, no feature locks, no ads inside the app.