Muscle OS

A focused workout tracker for serious lifters. Plan. Log. Progress.

Muscle OS is a focused workout tracker built for lifters who train with intent. Plan your programs, log every set, and watch your strength climb session after session — all in a clean, dark-mode interface designed for the gym.

NO NOISE, JUST TRAINING

No social feed. No streak gimmicks. No challenges getting between you and your barbell. Muscle OS is the tracker that lives next to you between sets — fast, quiet, and respectful of your time.

WHAT YOU CAN DO

• Build programs your way. Pick a curated public program (Push Pull Legs, full body splits, hypertrophy blocks, and more) or build your own from scratch. Choose a fixed weekly calendar or a flexible rotation. Set target sets, reps, rest, and tempo per exercise. Clone any public program to make it yours.

• Log sessions that match how you train. Start today's workout straight from your active program, switch to a different workout in the same plan, or go fully free-form. Track weight, reps, and tempo, with a built-in rest timer between sets. Edit past sessions whenever you need to.

• See real progress. Total sessions, weekly volume trend, per-exercise strength curves with automatic PR detection (estimated 1RM via the Epley formula), program activity heatmaps, and milestone history. Pin your key lifts to keep them on your dashboard.

• Browse a deep exercise library. Hundreds of curated exercises with muscle-group filters and a fast picker. Add your own custom exercises any time.

• Log body weight. Manual entries with full history. See your latest weight at a glance on the dashboard.

• Navigate by calendar. Color-coded session dots for each program workout, scheduled days highlighted, jump back to any past day in two taps.

• Get progressive overload nudges. The dashboard surfaces actionable suggestions based on your last performance — for example, "Bench Press: add 2.5 lb next session."

DESIGNED FOR THE GYM

• Dark-mode interface, easy on the eyes between sets • Floating tab bar that stays out of your way • Haptic feedback on key actions • Crash-resistant: your in-progress session is preserved even if the app is killed mid-workout • Offline-tolerant cache so the app stays usable on patchy gym Wi-Fi

YOUR ACCOUNT, YOUR DATA

• Sign in with Apple, Google, or a passwordless email link — your call • Switch between pounds and kilograms in one tap • All data securely synced across devices • Available in English, French, German, Spanish, and Italian

Built by lifters, for lifters. Pick up Muscle OS, plug in your program, and get back under the bar.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://muscle-os.app/en/privacy