Comparison
RepStack vs Strong: logbook or progression engine?
Strong is still one of the cleanest pure workout logs. If all you need is a fast place to record sets, it remains a sensible pick.
RepStack is for the lifter who wants the log to do more work: keep the program moving, tell you what to lift next, preserve history offline, and turn repeat sessions into progression targets.
| Feature | RepStack | Strong | Edge |
|---|---|---|---|
| Core job | Logging plus next-session targets | Workout and routine logging | RepStack |
| Free routine limit | Unlimited routines and programs | Free version is limited to 3 templates | RepStack |
| Progressive overload | Built-in double-progression rule engine | Manual planning | RepStack |
| Plate calculator | Included | Listed as a Strong PRO feature | Tie |
| Charts | Strength Score, trends, PRs, projections | All charts are listed under Strong PRO | RepStack |
| Best fit | Structured lifters who want exact targets | Lifters who want a familiar pure logbook | Tie |
Where RepStack wins
- RepStack keeps the same fast logging loop but adds a clear prescription for next time.
- The free tier is more generous for lifters who run more than three saved routines.
- Strength Score and e1RM trend logic give you a faster read on whether the block is working.
Where Strong wins
- Strong has a long track record and a very familiar logbook model.
- If you already manage progression in a spreadsheet, Strong can be enough.
- Strong’s simplicity is a strength for lifters who do not want coaching logic in the app.
The real difference
Strong is organized around recording. RepStack is organized around the next session.
That sounds small until week six of a program. At that point, the useful app is not the one with the prettiest history list. It is the one that turns 100kg x 12, 11, 10 into a clear target for next Monday.
Free tier decision
Strong’s own help center says free users can create up to 3 workout templates. RepStack’s free tier is intentionally more generous for core logging so routine limits do not force a switch before the app proves value.
That matters for PPL, Upper/Lower, and rotating strength blocks where three saved routines disappear fast.
Sources
Checked against official pages where possible.
FAQ
Fast answers
Is RepStack better than Strong?
RepStack is better if you want next-session targets and a more generous routine setup. Strong is better if you want a familiar pure logbook and manage progression yourself.
Can RepStack replace Strong?
Yes for lifters who want set logging, saved programs, PRs, charts, and progression guidance in one workflow.
RepStack for iPhone
Use the tracker that gives you the next target
RepStack keeps your program, logs the work, and calculates what to chase next.