Now sounding
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Pick a root and a quality below, or touch the keys.
—function in key
Chord Explorer
Root
Quality
Extended PRO
Arpeggiator
Output
MIDI: checking…
0 chords
0 notes
0 unique
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Chord Library
Twelve essential shapes.
The chords behind most of the songs you love. Tap one — it lands on the keys, plays, and explains itself.
Theory, decoded
Luxury-grade music theory.
🎼
Intervals, named
Every tone in the chord is tagged with its degree — root, third, seventh, thirteenth — so the anatomy of the sound is always visible.
𝄢
Roman numerals, live
Choose any key and Harmony Pro reads your chord as a function — IV, vi, V7 — the language of progressions, computed in real time.
🎹
Reverse recognition
Build a mystery voicing by hand or on a MIDI keyboard and the engine names it — inversions included, slash chords and all.
0Chords free
0With PRO
0Keys, C3–B5
0Arp patterns
Harmony PRO
Unlock the full harmonic palette.
- Ten extended qualities — 6ths, 9ths, 11ths, 13ths, ø7, altered dominants
- Export any chord or arp pattern as a MIDI file for your DAW
- Unlimited saved progressions across devices
$7.99/mo or $79/yr · or every AURA app with AURA ONE — $49.99/mo