Simple Muscle
AI-native workout tracker
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
Simple Muscle is an AI-native workout tracker built for the moments between sets—now on iPhone and Apple Watch—and for the AI chat you already use.
Plan a workout once, then log each set quickly with clear controls for reps, weight, or time. Move between exercises, add extra sets, and manage recovery with a rest timer that follows your workout to the Lock Screen and Dynamic Island.
Take your saved workouts to Apple Watch and train without carrying your phone. Follow your workout exercise by exercise, adjust weight, reps or duration, complete sets, and manage rest periods directly from your wrist.
The core tracker is free and works offline. Create workouts, explore a library of more than 400 exercises, review session history, check weekly volume, view progress charts, adjust kg/lb and rest settings, and complete workouts without an account.
Optionally save completed workouts to Apple Health so they appear in your activity history.
If you sign in, optional sync can back up and restore your training data across devices. With the optional AI Connection subscription, Simple Muscle can connect to ChatGPT, Claude, or other MCP-compatible assistants so an assistant you authorize can plan, edit, and analyze workouts using your training history.
Features:
- Apple Watch workout tracking
- Workout templates and custom workout creation
- Active workout mode with exercise and set progress
- Reps, weight, and duration tracking
- Rest timer with pause and end-rest controls
- Library of more than 400 exercises
- Exercise filters, instructions, videos, and common mistakes
- History, weekly summaries, session details, and progress charts
- Kg/lb and week-start preferences
- Lock Screen Live Activities and rest notifications
- Optional Apple Health workout saving
- Optional account sync and AI Connection
Simple Muscle is intended for personal fitness tracking and does not provide medical advice. Exercise involves risk. Choose appropriate movements and loads, stop if something feels unsafe, and consult a qualified professional before starting or changing a program when needed.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Connect Simple Muscle to ChatGPT directly from Settings. You can also reorder or remove exercises during a workout without changing your saved routine.
The developer, Vladimir Haltakov, 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
- Vladimir Haltakov
- Size
- 129.6 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Simple Muscle Yearly Plan $49.99
- Simple Muscle Monthly Plan $4.99
- Copyright
- © 2026 Creafex Lab Vladimir Haltakov