Built for serious lifters
Know exactly what to lift next.
RepStack tells you what weight to target, detects every personal record, and shows which muscles need rest — so you can focus entirely on lifting.
Free · No credit card · Completely private
Everything you need to train smarter
RepStack combines session logging, program management, and analytics in one private, ad-free app.
Progressive Overload
RepStack pre-fills your target weight and reps based on your last session, so you always know exactly what to aim for to keep progressing.
Personal Record Detection
Every session is checked against your history. When you set a new PR, RepStack celebrates it — tracking your best weight, best set, and estimated 1RM.
Training Programs
Build fully custom programs with days, exercises, sets, and rep targets — or choose from built-in programs like PPL, Starting Strength, and Upper/Lower Split.
Muscle Heatmap
See exactly which muscle groups you've trained recently and which need attention — colour-coded by recency across 9 muscle groups.
Strength Analytics
Track estimated 1RM, max weight, and total volume over time with interactive charts. Built-in plate calculator and 1RM estimator included.
Private by Design
No ads, no tracking cookies, no selling your data. Your workout history belongs to you — export it any time as CSV or delete your account instantly.
Start tracking for free
Join lifters who log every rep, chase every PR, and train with purpose. No credit card required.
Start Tracking Free