Flex AI Workout Trainer & Log
Fitness Tracker & Gym Planner
Free · In-App Purchases
Your AI-Powered Gym Tracker & Personal Trainer
Smash your fitness goals with Flex – the ultimate AI workout tracker that plans, tracks, and adapts to your progress. No more guesswork! Whether you're lifting weights, building muscle, or losing weight, Flex helps you stay on track and push past plateaux.
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Smarter Gym Tracking, Faster Progress
- Track every lift & rep automatically – no need for a manual training diary.
- AI-driven workouts that adjust difficulty based on your performance.
- Track progress visually with real-time charts and streaks.
- Sync with Apple Watch for hands-free workout tracking.
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Your AI Personal Trainer
- Get expert guidance from an AI fitness coach that adapts to you.
- Auto-adjusts weight, reps, and sets to maximise strength gains.
- Receive reminders & real-time coaching on form, rest time, and intensity.
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Build Muscle, Lose Weight, Stay Motivated
- Follow structured workout programmes or create your own.
- Log every gym session with our lifting log and training diary.
- Compete & compare progress with friends in the Flex community.
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Free vs. Premium Plans
*Free Plan:
- Access premade workouts
- Track workouts & progress
- Customise your training plans
*Flex Premium (£8.99/month or £54.99/year):
- Apple Watch logging
- Auto Progression: Adjusts difficulty automatically
- Premium training programmes & freestyle workouts
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Download Flex Now – Your AI Coach Awaits!
Smash PBs. Track Gains. Train Smarter.
Join thousands of lifters & athletes who trust Flex to track workout progress and take their gym routine to the next level.
Download now and start lifting smarter!
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Follow us for tips & updates:
Instagram: @flex.ai
TikTok: @flex.app
Website: flexfitnessapp.com
Ratings & Reviews
• New design: Flex now has a revamped interface with a modern look and improved usability.
• Smarter AI trainer: Lex now creates and progresses your workouts with even more precision and intelligence.
• Performance improvements and bug fixes.
The developer, Flex Artificial Intelligence Inc., 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 Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Location
- Contact Info
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Flex Artificial Intelligence Inc.
- Size
- 601.4 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Apple Vision
Requires visionOS 2.0 or later. - Apple Watch
Requires watchOS 11.0 or later.
- iPhone
- Languages
English and 12 more
- English, Dutch, French, German, Hindi, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Telugu
- Age Rating
16+
- 16+
- Infrequent
Contests
Contains
Messaging and Chat
User-Generated Content
Health or Wellness Topics
- In-App Purchases
Yes
- Premium Plus Family Monthly $49.99
- Premium Plus Yearly $119.99
- Premium Plus Family Yearly $299.99
- Premium Plus Monthly $19.99
- Premium Yearly Subscription $83.99
- Premium Subscription Monthly $12.99
- Copyright
- © 2026, Flex AI Inc.
