iOS · Workout Tracker
Every rep,
remembered.
A fast, private workout tracker for lifters. Log every set, track your PRs, and watch your strength climb. Offline, no account.
Every session counts · Free
Everything you need
Track every lift.
Watch it add up.
Log a set in seconds
Weight, reps, done. Stack is built to disappear between sets so you can get back to lifting. Last session's numbers sit right there, so you know what to beat.
Watch the numbers climb
Every lift feeds a clean progress chart. See a movement trend up over weeks and months, and a 52-week heatmap of every session you showed up for.
Know your bests
Max weight, best volume, and estimated 1RM, tracked for every lift. Beat one and it's there waiting the next time you train.
Rest without watching the clock
A built-in timer starts the moment you finish a set. Countdown and interval modes, with a chime when it's time to go.
70+ exercises, plus yours
A full library across every muscle group. Add your own moves and attach notes or a video reference to any of them.
Bring your history with you
Coming from Strong? Import your whole history in one CSV and pick up exactly where you left off.
Why Stack
Strength is built
one session at a time.
It’s built in the boring middle: the workouts nobody posts, the small wins you’d forget if something weren’t keeping count. Stack keeps count. It’s a quiet, fast, private place to log the work and watch it add up, so the only thing you have to bring is the next session.
Private by default
Your data never leaves your phone.
No account, no cloud, no analytics. Stack keeps every workout on your device, because your training is yours.
Read the privacy policy →