The app calculates when each section of your repertoire needs your attention — not too soon, not too late. Based on the FSRS algorithm, the same science used in the best language learning tools, now applied to motor skills.

When you consistently nail a section, the app nudges your practice tempo upward. Small, proportional steps — because research shows sudden large jumps in tempo undo consolidation.

When a session goes wrong and frustration builds, the app stops you. Not because you failed — but because practicing while frustrated encodes the errors, not the corrections. A fresh attempt after sleep is always more effective.

A metric that tells you more than success rate ever could: how many errors do you make before your first correct repetition? When that number drops, your motor memory is genuinely consolidating.

Optional. Add your own Groq API key and the app generates a plain-language analysis of your practice patterns — what's progressing, what's stalling, and what to focus on next.

Everything stays in your browser. No account, no server, no cloud. Export a backup anytime and import it into any future version of the app — nothing is ever lost.