Scale Runner

Scale Runner turns music theory into something you play, not something you read.

Pick a mode and the app names a scale or a chord. You answer on a MIDI keyboard or the on-screen keys, and every note is checked as you play it. In the timed modes it checks when you played, too, against a metronome that never drifts.

SIX WAYS TO PRACTICE
• Scales — play scales from a random key, note by note
• Chords — build the named chord, holding all the notes at once
• Voicings — capture a voicing, then play it in all 12 keys
• Scale Running — hold chords and run their modes in time, key by key
• Inversion Running — walk a chord up its inversions an octave and back down
• Jam Mode — comp diatonic chords in time, one per bar, in a single key

WHAT'S COVERED
• 25 scales — all 21 modes of the major, harmonic minor and melodic minor scales, plus both pentatonics, blues and chromatic
• 13 chord types — triads, sixths, sevenths, sus and diminished
• All 12 keys, cycled chromatically or by fifths
• 5 progression presets, including 12-bar blues, as triads or sevenths

PLAY IT YOUR WAY
Connect any class-compliant MIDI keyboard or digital piano over USB or Bluetooth and the app remembers it, reconnecting on its own next time. No keyboard? The on-screen keys do everything.

TIMING YOU CAN TRUST
The metronome runs on absolute time, so it stays honest at any tempo from 40 to 240 BPM. A quick calibration measures your device's audio and Bluetooth latency and subtracts it, so an on-beat press reads as on-beat. Set the windows to Easy, Normal or Strict.

KEEP THE HABIT
Daily streaks with milestones, practice reminders at a time you choose, and per-key, per-chord and per-mode stats that show what you have actually drilled.

PRACTICE WITH FRIENDS — OPTIONAL
Sign in to back up your streak, invite friends, applaud their practice and compare streaks. Only your display name, avatar and streak are shared, and only with friends you invite. Everything else works signed out and offline.

SCALE RUNNER PRO
A one-time unlock, yours forever:
• Scale Running, Inversion Running and Jam Mode, unlimited
• Full progression presets, sevenths and key cycles
• Unlimited saved voicings
• Streak protection — one missed day a week is repaired automatically

Every timed mode is free to try three times before you decide.

Recent changes:
New: Free Play names the notes, intervals and chords you play, live.
Sign in to sync voicings, settings, stats and streak across devices.
Metronome time signatures: 3/4, 4/4, 5/8 and 6/8.
Arpeggiated Notes: build chords one note at a time on the on-screen keys.
Home is split into Practice and Drills, with a count-in before each new key and a quick guide for every mode.
Guitar: strike the chord on beat one in Scale Running.