Workout tracker
BTB is a training notebook you can use at the gym without thinking.
Open it, copy your last session, and change today's numbers. Logging a set takes seconds.
iPhone · No signup · Zero ads · Core features free · Works offline
Features
Copy last session into today with one tap. A custom keypad and last-time suggestions finish your entry in seconds.
Tick sets off on Apple Watch or the iPhone Lock Screen — no unlocking, no app to open, so you never touch your phone mid-exercise.
CSV export, even on the free plan
offline-first, zero ads
LIVE DEMO
No install. Tap around the actual app with sample data loaded — log sets, open the analysis. Nothing you do is saved.
Runs in your browser · sample data · nothing is saved
The principles
Look back any time at weight and volume trends per exercise and your full history. Export every record as CSV.
Volume trends per exercise show progressive overload as numbers, not as a feeling. No score, no grade, no black box: BTB shows the raw figures behind every conclusion, so you can check the reasoning yourself.
Just log weight, reps, and sets. BTB maps each exercise to the muscles it works, so weekly hard sets per muscle — chest, back, shoulders, arms, legs — pile up on their own. That question doesn't get answered by your memory. It gets answered by the numbers.
Logging and per-exercise progress are free. Weekly sets per muscle are Premium.
Pricing
Core features are free — including CSV export.
FAQ
Yes. It's built offline-first, so logging stays fast even in gyms with no signal. Once signed in, your data syncs to the cloud automatically when you're back online.
Yes. Export to CSV or text even on the free plan. We never lock your data inside the app.
Logging, per-exercise volume trends, export, and cloud sync are free. The Analysis screen — weekly sets per muscle, muscle breakdown, period trends — is Premium.
15 languages, including English, Japanese, German, Spanish, French, Italian, Korean, Portuguese, Chinese, and more.
No ads at all — so you stay focused mid-set.
Catch undertrained muscles before they stall your progress. Balance your week by the numbers, not by feel.
Tired of training hard and not growing? The answer is in the details: program structure, the right amount of volume and intensity, how to bust through plateaus, what to eat, and how to recover. We've distilled the research into 169 practical articles. Jump in wherever your biggest question is.
Intensity & Volume
Progressive Overload: 5 Ways to Increase Weight and Reps
Five ways to progress without relying on weight alone, and when to use each
Intensity & Volume
Hypertrophy: Aim for 10–20 Sets per Week | How to Tell If You're Doing Too Few or Too Many
How to judge and adjust 10-20 weekly sets for yourself
Breaking Plateaus
7 Reasons You're Not Building Muscle | The Checklist for Lifters Who Train Hard and See Nothing
Self-diagnose why you're not growing with a ranked checklist of the 7 most common causes
