Modal Chord Explorer
All Seven Modes · Real Piano Audio · Free
A complete modal harmony toolkit for composers, producers, and musicians. Explore every chord in every mode — and build progressions with a single tap.
Each mode with its own harmonic palette and character
From basic triads to complex extensions — all in one place
Every chord plays back using the Salamander Grand Piano — the same sample library used by professional notation software.
Explore diatonic chords from simple triads through 7th, 9th, 11th, and 13th extensions across all seven modes.
Visual resolution arrows show which secondary dominants pull toward each diatonic chord — perfect for harmonic tension and release.
Browse borrowed chords from all six parallel modes, deduplicated and organized so you can find the color you're looking for instantly.
Build a progression chord by chord and play it back in sequence. Save and rearrange your ideas in real time.
Curated Verse, Chorus, and Bridge progressions for every mode — each with a shuffle button to spark new ideas instantly.
An interactive keyboard highlights the exact notes of each chord as it plays, so you can see and hear the harmony simultaneously.
Transpose instantly to any of the 12 root keys. The entire harmonic system updates in real time — no reloading.
Open in your browser and play your first chord in seconds.
Launch Atlas HarmoniaAtlas Harmonia grew out of Tom Tolleson's work as a composer and multi-instrumentalist — a tool built to make modal harmony explorable and immediate. Tom is the founder of Dymaxion Groove Records and an alumnus of Juilliard's Evening Division.
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