Real MIDI Keyboard Support
Connect any MIDI keyboard over USB or Bluetooth. ChordFrog recognises chords in real time — including inversions and slash chords.
Ear Training — Reimagined
Train Your Ear. Master Chords. Leap Further.
ChordFrog is the free iOS ear training app that grows with you — connect a MIDI keyboard for real-time chord recognition, or use quiz modes anywhere. Five progressive levels take you from simple triads to the full chord vocabulary.
Scan to install on your iPhone
Free · iOS 16 or later
Free on the App Store MIDI Keyboard Support Play Without a Piano 5 Progressive Levels
Landscape on iPhone · Portrait, landscape & resizable windows on iPad
Everything you need to develop a real musical ear
Instant Ear Training
Hear target chords played with a premium piano sample library and train yourself to identify them by sound alone.
No Piano? No Problem.
Leap Quiz and Travel Chords modes work anywhere — on the bus, in a waiting room, whenever you have a few minutes.
Progressive Difficulty
Five levels grow from campfire essentials to seventh chords, suspended colours, diminished shapes, sixths, and more.
Scored Game Rounds
Ten questions per round, three tries per chord, up to 100 points. First-try answers score 10; second try 6; third try 3 — so accuracy matters.
Reference Playback
Hear every chord exactly as written, played with a rich grand-piano sound — then replay it whenever you need another listen.
Four ways to practise
Whether your keyboard is plugged in or packed away, ChordFrog has a mode for the moment.
Pick a level, listen to the mystery chord, then play it on your keyboard. Ten questions per round, three tries per chord, up to 100 points — every attempt counts.
Just play. ChordFrog identifies every chord in real time — triads, seventh chords, slash chords — and shows the name, inversion, and pitch classes instantly.
Four options. One chord. Ten questions per round, three tries each, up to 100 points — the same scored format as Lily Pad Drill, no keyboard required.
Tap any chord to hear it. Browse all practice-level chords grouped by level — a handy audio reference you can reach for anytime, anywhere.
Five levels. One deep pond.
Follow the path of a real musician — from campfire classics to the full harmonic vocabulary.
1
The Campfire Common chords in pop & folk
2
The Session All major and minor chords
3
The Gig Add dominant 7th & major 7th
4
The Studio Add minor 7th, sus2 & sus4
5
The Abyss Everything — dim, aug, 6ths & more
1
The Campfire
Common chords in pop & folk
2
The Session
All major and minor chords
3
The Gig
Add dominant 7th & major 7th
4
The Studio
Add minor 7th, sus2 & sus4
5
The Abyss
Everything — dim, aug, 6ths & more
Frequently asked questions
Do I need a MIDI keyboard to use ChordFrog?
No. ChordFrog has two modes that work without a keyboard: Leap Quiz (multiple-choice ear training) and Travel Chords (tap to hear any chord). For Lily Pad Drill and Free Pond, a MIDI keyboard is required for real-time chord recognition.
What MIDI keyboards are compatible?
ChordFrog works with any class-compliant USB MIDI keyboard when used with a suitable adapter (e.g. Lightning or USB-C). Bluetooth MIDI keyboards are also supported on compatible iOS devices, so you can connect wirelessly.
What chord types does ChordFrog recognise?
In Free Pond, ChordFrog recognises a wide range of chords: major, minor, diminished, augmented, sus2, sus4, major 7th, dominant 7th, minor 7th, diminished 7th, half-diminished, major 6th, minor 6th, add9, and slash chords (e.g. C/E). Lily Pad Drill and Leap Quiz introduce this wider vocabulary gradually across five progressive levels.
How are the practice levels structured?
Level 1 (The Campfire) covers the most common chords in pop and folk — white-key majors plus Am, Em, and Dm. Level 2 (The Session) adds all remaining major and minor chords. Level 3 (The Gig) adds dominant 7th and major 7th. Level 4 (The Studio) adds minor 7th, sus2, and sus4. Level 5 (The Abyss) includes everything — diminished, augmented, 6ths, and more. You can practise any level in Lily Pad Drill or Leap Quiz.
Is ChordFrog suitable for beginners?
Yes. Start with Level 1 and Leap Quiz or Travel Chords to build familiarity without any equipment. Ten-question rounds make progress easy to fit into the day. When you have a MIDI keyboard, Lily Pad Drill adds real-time physical playing to the mix.
What device and iOS version do I need?
ChordFrog requires iOS 16 or later. It runs on iPhone and iPad. For MIDI, use a Lightning or USB-C adapter for USB MIDI, or a Bluetooth MIDI keyboard where supported.
Is ChordFrog free?
ChordFrog is free to download. Check the App Store listing for current pricing and any in-app offerings.