StackUp – Simple Gym Tracker

Undisputed Development

About this app

The gym tracker that answers the only question that matters: what do I lift today?

StackUp is a workout tracker for strength training that does progressive overload for you: it reads your reps and fills in next session's weight before you get there.

StackUp's arrow system turns your reps into a decision:
▲ above your target range → more weight next time
▬ inside the range → the weight stays
▼ below the range → less weight next time

HOW PROGRESSIVE OVERLOAD WORKS HERE
• Log your reps per set — the arrow appears as you type and shows what it means: "16 reps → next time 62.5 kg ▲"
• Finish the workout — StackUp remembers every arrow
• Next session, the adjusted weight is already filled in. No spreadsheets, no math at the squat rack.

SMART STRENGTH TRAINING, NOT BLOATED
• Deload detection: three ▼ sessions in a row and StackUp suggests a real reset instead of another small step down
• Personal records: beat your best on any lift and the finish summary says so
• "Last time" on every exercise: 15/12/9 @ 60 kg — right where you need it
• Tap the arrow to override any suggestion. You stay in charge.

157 EXERCISES, OR YOUR OWN
• An exercise tracker with a full library — barbell, dumbbell, machine, cable, bodyweight — filtered by muscle group
• Cardio too: log time and distance, with a stopwatch that keeps running if you leave the app
• Supersets and circuits: group exercises and StackUp rests between rounds, not between sets
• Add your own exercise in seconds. Nothing here is set in stone.

A GYM LOG WITH EVERYTHING YOU NEED
• Ready-made splits (Upper/Lower, Push/Pull/Legs, Full Body) — fully editable
• Per-exercise rep ranges and weight increments
• Progress charts for every exercise, and a full workout log of every session
• Backup & restore — your data, your file
• kg or lbs, dark mode, English & German

PRIVATE BY DESIGN
Free. No ads, ever. No account needed. Works offline — everything lives on your device. Optional: sign in with Google to sync your log between your devices, free. Your data stays yours: export it or delete it from the app any time.

EARLY DAYS — AND YOU GET A REAL ANSWER
StackUp is a young lifting app, built by one person who trains. Every feature here came from someone asking for it. Mail me and you get an answer, not a ticket number: [e-mail]

Simple. Uncluttered. Serious. Built for people who lift.

What’s new

Bug fixes:

• Workout: the "only on this phone" backup reminder no longer shows when you're signed in and your log is synced
• Pop-up cards like "How progression works" no longer cut off their button on wide screens, and taps no longer go through them to the screen behind