The reflex trainer that turns Nashville Numbers into muscle memory — in any key, under pressure.
Most musicians "understand" Nashville Numbers — until the key changes on stage and their brain freezes.
The band leader says "up two keys" and your hands stop. You know the theory, but your fingers can't keep up in real time.
Knowing I–V–vi–IV on paper is not the same as instantly playing it in E♭. There's a gap between knowledge and reflex.
YouTube teaches theory. Books explain harmony. But nothing lets you quantify your tonal reflex and track real improvement over time.
Chord Reflex doesn't teach you more theory — it trains you to react so fast that thinking becomes optional.
Track your reaction time in milliseconds. Lightning-fast responses earn bonus points and unlock achievements.
Per-key accuracy tracking shows exactly where you're solid and where you need work. No hiding behind easy keys.
EWMA trend analysis shows your long-term trajectory. One bad session won't erase weeks of progress.
Short, focused sessions that build real muscle memory over time.
Pick a single key to focus on, or turn on Random Keys mode to train across all 12 keys — just like a real session.
A scale degree flashes on screen. Tap the correct chord on the keyboard — as fast as you can. Your reaction time is recorded in milliseconds.
See accuracy and speed trends for every key. Unlock speed stats when your accuracy proves you're ready. Watch yourself improve over weeks.
Chord Reflex tracks every answer — speed, accuracy, and trend — so you always know exactly where you stand.
No more guessing if you're "getting better." See your reflex sharpen in real data.
The EWMA algorithm ensures one bad day doesn't tank your stats. Only consistent change moves the needle.
Every feature exists because a real musician needed it during real practice.
Focus on one key or train across all 12 with automatic key changes every 10 questions.
Every answer timed to the millisecond. Speed bonuses reward lightning-fast reflexes.
See accuracy and speed for each of the 12 keys. Know exactly where your weak spots are.
Exponentially weighted moving averages show your true trajectory, not just today's score.
Earn points, build streaks up to 3x multiplier, and compete against your own best.
Instant sound and haptic response for correct and incorrect answers. Feels like a real instrument.
I kept freezing every time the key changed during worship rehearsal. I knew the Nashville Numbers — on paper. But under pressure, my fingers couldn't keep up. I looked for a tool that could train my reflex, not teach me more theory. It didn't exist. So I built it myself. Every feature in Chord Reflex exists because I genuinely needed it.
Join the beta and be the first to turn your Nashville Number knowledge into real muscle memory.
No spam. We'll only email you when the beta is ready.
We'll reach out when the beta is ready. Keep training.
It's a method of representing chords by their scale degree (1, 2, 3…) instead of note names (C, D, E…). This makes it easy to transpose songs to any key instantly — if you have the reflex for it.
You should know basic chords and scale degrees. Chord Reflex is not a theory teacher — it's a reflex trainer for musicians who already understand the basics but want to react faster.
iOS first (iPhone). iPad and Mac support are planned for future versions.
Yes. Beta testers get free access via TestFlight. Your feedback will directly shape the final product. A Pro version with additional features will be available at launch.
MIDI input is planned for v2, so you can practice with your actual keyboard. The current version uses an on-screen piano keyboard.