Today tab
Walk in knowing what to lift.
RepStack reads your last sessions and gives the exact target for every set. If the gym is packed, swap the day, replace an exercise, or edit sets without rebuilding the whole program.
iPhone gym workout tracker
Know what to lift next.
RepStack logs your sets, reads the last workout, and turns that history into exact targets for the next session. No spreadsheet math in the rack.
Free logging. No account required. Offline-first in the gym, with optional iCloud sync.
873
exercise guides
with muscles, equipment, and images
0-999
Strength Score
bench, squat, deadlift, OHP, and row
offline
first logging
SQLite on device, no account required
1 tap
to train
resume, swap days, or quick start
Why lifters switch
The workout loop, cleaned up.
RepStack is built around the few moments that matter: start fast, log cleanly, and know what changes next time.
Progression engine
Progressive overload without spreadsheet math.
Hit the top of your rep range and the app bumps weight. Stall twice and it pulls back. Rate the last set and tomorrow's prescription adjusts around how the set actually felt.
Import
Bring your program or history with you.
Paste a coach's program, upload a spreadsheet, or import CSV history from Strong and Hevy. RepStack matches exercises and keeps your stats moving.
Free tools
Use the web tools. Let the app remember the work.
Fast answers for real gym decisions: estimate a max, load a bar, pick a substitute, or check whether the block is moving.
Training library
873 exercises, sorted by the muscle you came to train.
Every page connects form cues, equipment, movement images, similar exercises, and the rest of the RepStack training system.
Method, not fluff
Read the rules behind the product.
Guides, standards, imports, and comparisons are written as the public version of RepStack's training logic.
Progressive overload guide
The exact double-progression rule RepStack uses for reps, weight jumps, holds, and deloads.
How to track workouts
A cleaner logging system for lifters who want useful history instead of clutter.
Import workout history
Move Strong, Hevy, Google Sheets, or Excel data without losing the set history you already earned.
Strength standards
Bodyweight bench, 2-plate bench, 1000 lb club, and lift ratios with next-step training rules.
Exercise and app alternatives
Constraint-specific swaps for lifts, equipment, and workout trackers without generic list spam.
Workout programs
PPL, Upper Lower, full body, powerbuilding, and dumbbell programs with exact progression rules.
RepStack vs Strong
A candid comparison for lifters choosing between a logbook and a progression engine.
Switching apps
Bring Strong or Hevy history instead of starting from zero.
Import CSV history, match exercises, preserve stats, then let RepStack use that history for weight suggestions, PRs, and progress charts.
e1RM, max weight, max reps, and max volume PRs are detected after every workout.
FAQ
Before you download
Is RepStack free?
Yes. RepStack includes unlimited workout logging, the exercise database, built-in programs, rest timer, plate calculator, 30-day history, and personal records for free. Pro adds progression coaching, imports, Strength Score, projections, unlimited history, iCloud sync, and Live Activity.
Does RepStack work without internet?
Yes. Workouts, programs, exercise images, PRs, and the local progression engine run on-device with SQLite. Internet is only needed for optional cloud sync, import parsing, and App Store subscription checks.
Can I import from Strong or Hevy?
Yes. RepStack imports CSV workout history from Strong and Hevy, matches exercises against the 873-exercise database, and preserves progress so your next workouts are based on your real history.
How does RepStack decide what weight I should lift?
RepStack uses a double-progression engine. It adds reps inside your target range first, increases weight after all sets hit the top of the range, and suggests deloads when performance stalls or a set is rated too hard.
Show up. RepStack handles the math.
Download free on the App Store and log your next workout in under a minute.