Now in beta · iOS & Android
Train smarter. Progress faster.
Muscle OS is a strength-training tracker that helps you build custom programs, log every set, and watch your numbers climb week after week.
Free to download. Muscle OS Plus unlocks at $1.99/month or $9.99/year after a 7-day free trial.
Everything in Muscle OS Plus.
One subscription, unlocked across iPhone and Android.
Unlimited custom programs
Build any split. Linear progressions, blocks, rotations — your structure, not someone else’s template.
Per-muscle volume heatmap
See exactly which muscles you trained this week. Adjust before plateaus show up in the mirror.
Apple Health & Health Connect sync
Workouts and body weight flow back to your phone’s health hub. No double-logging.
Auto-progression suggestions
Hit your reps last time? The next session bumps the load. Missed them? It backs off intelligently.
Full session & body weight history
Every set, every rep, every check-in — searchable, exportable, yours forever.
Simple pricing.
Start free. 7-day trial when you upgrade. Cancel anytime.
Annual
$9.99
per year · $0.83/mo
Monthly
$1.99
per month
Auto-renewable subscription information
- Title: Muscle OS Plus — Monthly ($1.99/month) or Annual ($9.99/year).
- Payment will be charged to your Apple ID or Google Play account at confirmation of purchase.
- Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period.
- Your account will be charged for renewal within 24 hours prior to the end of the current period at the price of the selected plan.
- Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings on the App Store or Google Play after purchase.
- Any unused portion of a free trial period will be forfeited when the user purchases a subscription.
By subscribing you agree to our Terms of Service and Privacy Policy.
Ready to lift?
The app is free. Plus is optional. Either way, your training data stays yours.