ChordFlow: Piano Chord Trainer

ChordFlow turns your iPhone or iPad into a chord practice room. Play a chord and see its name instantly, build fluency with three sight-reading modes plus Cross-Key Practice, and improvise over the built-in accompaniment machine. Practice on the touchscreen, or connect a MIDI keyboard or digital piano.

REAL-TIME CHORD RECOGNITION • Recognizes 45+ chord types: triads, 6ths, 7ths, 9ths, 11ths, 13ths, sus and added-tone chords • Correctly names inversions and slash chords like Dm/G • A rising waterfall visualizes every note you hold • The sustain pedal (CC 64) is handled separately for sound and for analysis, so holding the pedal never blurs one chord into the next

PRACTICE MODES • Zen: no timer. Optional chord-tone hints, plus a grace window for pedal legato • Groove: play on the beat. The metronome keeps time and scores the timing of your first note • Fast: pure reaction. Nail a chord and the next one appears — chase your best BPM • Cross-Key Practice: Transpose and Mixed Keys drills

OPTIONAL MIDI KEYBOARD • Every feature works on the on-screen keyboard, which adapts to your device • Plug in a MIDI keyboard and the view expands to all 88 keys — connect or disconnect anytime • Velocity and sustain pedal supported • Prefer the sound of your own instrument? Mute the in-app piano

ACCOMPANIMENT MACHINE (PRO) • Preset progressions: 1-6-4-5, classic pop (4-5-3-6-2-5-1), Canon, pop-rock (6-4-1-5) and more • Create and save your own progressions, or have it draw random chords from qualities you pick • Block or arpeggiated playback, with adjustable tempo, chord duration, bass root, sustain, metronome and loop count • Play along, and colors show which target tones you actually hit

TRACK YOUR PROGRESS • Practice calendar with streaks, personal bests for every key, and full session history • 25 achievements covering key mastery, habits, theory and performance • Export and import your data anytime — everything is stored on your own device

PRACTICE YOUR WAY • All 12 keys, with 29 chord qualities and inversions configurable per position — major, minor, diminished, augmented, sus, and 7ths through 13ths • Keep drills diatonic, or lift the restriction and combine chords freely • Flexible matching (correct chord tones) or exact matching (bass note included) • Roman or Arabic numerals for scale degrees • 10 languages, with chord and theory terms following each language's own conventions

FREE VERSION INCLUDES Chord recognition, free play, all three sight-reading modes, Cross-Key Practice, and the built-in progressions, plus the practice calendar, personal bests and every achievement.

PRO UNLOCKS All 12 keys, custom progressions, and the accompaniment machine. Choose a monthly subscription with a free trial, or buy once and keep it for good.

GOOD TO KNOW • Works fully offline — no account, no ads, and no practice data ever leaves your device • Landscape orientation, designed for both iPhone and iPad • Made by an indie developer who uses it for his own improv practice. Questions or ideas? Email me — I usually reply the same day

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