Number System Trainer

Number System Trainer teaches you the Nashville Number System — the method worship musicians and session players use to learn songs fast, transpose on the fly, and communicate with any musician in any key.

Whether you're a beginner who only knows 3 chords or an experienced worship leader, this app meets you where you are.

6 INTERACTIVE MODULES
• Learn — A 5-step intro to how the number system works
• Read Charts — 4 levels from basic chords to slash chords
• Transpose — Move full progressions to any key instantly
• Ear Training — 3 levels, identify chords just by listening
• Play Along — See piano and guitar shapes in every key, with capo tips built in
• Circle of 4ths & 5ths — Tap any key to see all 7 chords

No login required. Works instantly.