tetsu

Log. Lift. Leave.

A privacy-first, no-BS workout logger for Android. Simple flow. Offline forever. Totally free. No ads. Open source.

Download APK View Source Star on GitHub
No account No ads No tracking Offline by default Achievements & goals CSV/JSON export & import Open source
Simple by design Free-text exercises, clear sets & rep ranges, supersets when you need them. Zero fluff, zero bloat.
Total privacy Your data lives on your device. No signup, no telemetry. Export to CSV/JSON any time—because it’s your data.
Offline & independent Everything runs locally. No accounts, no sync, no servers watching. Just your workouts under your control.
Goals & achievements Chase consistency streaks, personal records, and custom targets. Celebrate wins without broadcasting them.
Open & free 100% open source. No ads. Community-friendly, with a public roadmap and good-first-issues.

Screenshots

tetsu home screen
tetsu logging screen
tetsu progress heatmap
tetsu goals and achievements

How it works

  1. Create a workout (free-text, sets, rep ranges).
  2. Log sets with last session’s numbers visible.
  3. Finish, review the history heatmap, and unlock achievements while chasing your personal goals.

FAQ

Why another logger? Most trade your attention or data. tetsu is for lifters who want a quiet, private notebook that stays on their device.

Play Store? Coming later. Use the APK for now.

Where is my data stored? On your device. Export/Import with CSV or JSON—no lock-in.

Will you add programs/AI/timers? Only if they don’t compromise the simple, private logging loop. Privacy & simplicity first.