StayFit.
See every muscle you train
Only for iPhone
Free · In‑App Purchases
iPhone
See every muscle you train.
StayFit turns your workouts into something you can actually see. An interactive 3D body map lights up each muscle by how hard you've worked it — so you always know what you're hitting, and what you're neglecting.
FEATURES
• Interactive 3D muscle map that shades muscles by training effort, in real time
• Build custom workout splits — push/pull/legs, upper/lower, or your own routine
• Log sets, reps, and weight in seconds — plus cardio (run, bike, row, and more)
• Per-muscle recovery tracking so you know when each muscle is ready again
• Progress charts for volume, workouts, bodyweight, and cardio
• Apple Health sync for steps, active energy, and weight
• Works fully offline — no account needed, your data stays on your device
WHY STAYFIT
Most fitness apps are just lists of exercises. StayFit is visual. Watching your body respond to your training keeps you consistent and balanced — and makes it obvious when a muscle group is falling behind.
Whether it's your first week in the gym or your tenth year, StayFit gives you a clearer, smarter way to train.
STAYFIT PREMIUM
Unlock advanced features with StayFit Premium — a monthly or annual subscription with a free trial. Payment is charged to your Apple ID at purchase confirmation. Subscriptions auto-renew unless canceled at least 24 hours before the period ends; manage or cancel anytime in your App Store settings.
Privacy Policy: https://stayfit.dev/privacy
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
New in this update:
• New Premium training splits: 5x5 Strength, 6-day Push/Pull/Legs, 6-day Upper/Lower, Arm Specialization, Dumbbell Only, and Glute Focus.
• New cardio activities: Yoga, Pilates, Reformer Pilates, Barre, Dance, and Boxing.
• A clearer, single calories view on your Body page.
• Reliability and polish improvements.
The developer, N3D LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- N3D LLC
- Size
- 9.5 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Premium Annual $47.99
- Premium Monthly $11.99
- Copyright
- © 2026 N3D LLC