Chordindex
Live chord dictionary
$0.99
Play a chord — on a MIDI keyboard, the on-screen piano, or the fretboard — and Chordindex names it instantly, spelled for your key, on staff, piano, and guitar.
Play a chord. See the name.
Chordindex listens to whatever you're playing — a MIDI keyboard, the on-screen piano, or the on-screen fretboard — and names it in under a second: the name a musician would say in rehearsal, plus two to six alternate names when they apply. Triads, sixths, sevenths, adds, extensions, altered chords, slash chords and inversions — all identified live, spelled for whatever key you're playing in.
Every chord shows the same way on three instruments at once: grand staff, piano, and guitar fretboard. Play a shape on the fretboard and see it on the piano; play a chord on your MIDI keyboard and watch the staff and fretboard follow along.
It's also a reverse dictionary. Look up a chord by name and see its tones, its common aliases, a piano voicing, a guitar diagram, and the staff — no instrument required.
FEATURES
• Live identification: triads, sixths, sevenths, adds, extensions, alters, slash chords
• Two to six alternate names, ranked for what a musician would actually call it
• Grand staff, piano, and fretboard views of the same notes, always in sync
• Reverse lookup: search by name, see the voicing
• Rootless mode for the voicings your left hand would actually use
• Sustain pedal support (CC64), so held chords stay named after you release the keys
• Works with USB MIDI, Bluetooth MIDI, and other apps' virtual MIDI output
• No MIDI keyboard? The on-screen piano and fretboard work standalone
• iPad teaching layout with all three views on screen together; a focused, stacked layout on iPhone
• Light and dark themes
PRIVACY
Chordindex works offline. No account, no analytics, no microphone. MIDI is read only — the app never mutes, routes, or captures your instrument's actual sound.
Chordindex is an independent app. It is not affiliated with any other chord product.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Nguyen Nguyen, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Nguyen Nguyen
- Size
- 3.9 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Nuegyn with ❤
