Workout tracker
Did it go up since last time? How many sets did that muscle get this week? BTB Workout Log follows progress per exercise and weekly sets per muscle, with logging that takes seconds.
No scores, no AI telling you what to do. BTB lays out the numbers — the next session is your call.
iPhone · No signup · Zero ads · Core features free · Works offline
The principles
Growing muscle over time means getting enough training volume in while gradually adding weight or reps.[1][2][4] BTB makes the two numbers behind that call — progress per exercise and weekly sets per muscle — appear from your logs alone.
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.
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
Features
Just log your training — the numbers you need build up on their own.
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
fully offline, zero ads
Pricing
Core features are free — including CSV export.
FAQ
Yes. You can log fully offline. Once signed in, data syncs to the cloud automatically — perfect for gyms with no signal.
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 tab — 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 Keep Building Muscle | Weight, Reps, and Beyond
Five ways to progress without relying on weight alone, and when to use each
Intensity & Volume
How Many Sets Per Week to Build Muscle | 10-20 Sets Per Muscle, by Body Part
How to judge and adjust 10-20 weekly sets for yourself
Breaking Plateaus
7 Reasons You're Not Building Muscle | A Checklist for Lifters Who Are Putting in the Work
Self-diagnose why you're not growing with a ranked checklist of the 7 most common causes
