Jazz harmony · Chart scanning · Practice band
You know the chord name.
Your hand doesn't.
Photograph the chart and you get the chords, what each one does in the key, the scales that fit, and 3–5 shapes people actually play. Hit play, the band comes in.
Free on iPhone and iPad · Pro from $2.99/month · 7‑day free trial on the yearly plan
- No ads
- No tracking
- Works offline
- No account needed
- English · 中文 · 日本語
AI chart scanning · Pro
One photo, the whole chart.
Chords detected phrase by phrase, with roman numerals, harmonic function (T/SD/D) and the matching chord-scale. Import from iReal Pro, MusicXML, MIDI or plain chord text. Anything it gets wrong, you can fix.
Practice band
Practise alone, sound like a band.
Accompaniment styles × bass lines (walking bass included) × drum patterns, at any tempo. Loop a section, speed up step by step, record yourself and listen back. Playback lights the chart beat by beat, so your eyes never lose the place.
Learn harmony
Shapes curated, not dumped.
From common to advanced jazz chords, typically 3–5 playable voicings each, across positions and inversions. Diatonic chords in every key, the circle of fifths, intervals and a fretboard drill. Five original etudes explain not just what to play, but why it sounds good.
One chord, everything you need
The rest of the kit
Train your ear. Keep your time.
A precise tuner (guitar mode with alternate tunings, chromatic mode for any instrument or voice), a metronome from 2/4 to 12/8 with tap tempo, plus ear training and rhythm training in three levels.
Free to start. Pro when you want the band.
Everything for learning harmony is free. Pro adds AI scanning and the full band.
Free
$0
- Chords, scales, intervals and the circle of fifths
- Practice band with guitar and drums
- Ear and rhythm training, level 1
- Tuner (standard tuning) and metronome
Pro PRO
$2.99 / month
or $19.99 / year with a 7‑day free trial
- AI chart scanning and chart import
- Full band: bass, keys, percussion and every sound
- Transpose and practice recording
- Ear and rhythm training, levels 2–3
- All tunings, chromatic tuner, custom time signatures
Prices in US dollars; your App Store shows the price for your region. Subscriptions renew automatically and can be cancelled anytime in Settings › Apple Account › Subscriptions.
Questions
- Is it free?
- Yes. Learning chords, scales, intervals and the circle of fifths is free, along with the practice band (guitar and drums), level 1 of ear and rhythm training, the tuner in standard tuning and the metronome. Pro is an optional subscription.
- Do I need an account or an internet connection?
- No account is needed. Everything works offline except AI chart scanning, which needs a connection, and syncing favourites, which needs an account.
- What happens to the photos I scan?
- The image is sent through our server to Google Gemini for recognition and is not stored on our servers. Recognition is AI-powered and can be wrong — always check against the actual chart.
- Which instruments does it support?
- Chord shapes are for guitar. The practice band plays guitar, bass, keys, drums and percussion, and the chromatic tuner works for any instrument or voice.
- Is there an Android version?
- Not yet. It's planned — this page will link to Google Play when it's ready.
Your next chart is one photo away.
Free on iPhone and iPad.