Flex AI Workout Trainer & Log vs Boost
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flex AI Workout Trainer & Log
This app uses AI to provide personalized workout plans and real-time form feedback for weightlifters. It tracks progress, offers adaptive progression, and includes motivational features like leaderboards and streaks. It's designed for all experience levels, from beginners to pros.
- AI personal trainer
- Real-time form feedback
- Personalized workout plans
- Adaptive progression
- Strength tracking
- Community leaderboards
- Apple Watch integration
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Flex AI is the world’s first true AI personal trainer — built for lifters who want to train smarter, progress faster, and perfect their form. Whether you’re chasing size, strength, or consistency, Flex uses real-time AI to guide every rep, adjust your program, and keep you motivated through challenges, leaderboards, and streaks. - Your AI Coach, Every Rep Personalized workouts built automatically by AI personas that learn your goals, history, and preferences. Real-time form feedback powered by patented computer-vision AI — get instant corrections on squats, bench, deadlift, rows, and more. Adaptive progression and deloading backed by sports-science principles — no spreadsheets, no guesswork. - Train Smarter — See Results AI tracks your strength curve and increases weight when you’re ready. Visual progress graphs show PRs, volume, and recovery trends. Track sets, reps, and tempo with a tap — or automatically with Apple Watch. - Stay Motivated & Connected Join a global community of lifters. Compete on leaderboards, build streaks, and earn badges. Post progress photos, celebrate milestones, and share results. - Accessible to Everyone Free to start with all core features included. Upgrade anytime for advanced AI coaching and premium analytics. Designed for all experience levels — from beginners to pros. - Why Flex AI Real-time AI form feedback (patented) Adaptive, science-based programming Progress tracking & recovery insights Gamified streaks + leaderboards Apple Watch integration Built for hypertrophy & strength goals Start Training Smarter — Today Download Flex AI and experience personal training powered by real AI. Perfect your form. Unlock your best lift. Train smarter — free on iPhone + Apple Watch.
Boost
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Boost is your fitness companion built to match your goals, your level, and your progress. Start with a quick survey, then follow a workout plan that adapts as you log your training. What you can do with Boost Personalized workout plans: Tell us your goal (muscle gain, weight loss, strength, or general fitness) and your preferences, then get a plan tailored to you. Adaptive training: Your sets, reps, and recommended weights adjust based on your performance and consistency. Build your own routines: Edit your plan anytime or create a custom routine from scratch. Exercise library (180+ exercises): Browse a large library with guided videos to help you train with better form and confidence. Simple, user-friendly design: Log workouts fast, explore exercises easily, and stay consistent with minimal effort. Boost helps you stay organized, progressive, and motivated, one workout at a time. Download Boost and start training today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: Boost at 5.0 against Flex AI Workout Trainer & Log's 4.6. Boost also leads on iOS requirement (15.1 vs 18.0). Flex AI Workout Trainer & Log's advantage is ratings volume (2.4K vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Flex AI Workout Trainer & Log sells 8 in-app purchases, starting at $12.99 per month and Boost sells 1 in-app purchase, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.
Boost holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Flex AI Workout Trainer & Log has 2.4K ratings behind it against 1, so its average is the more settled of the two.
Both ship on a similar rhythm, roughly every 9 days. Both last shipped on October 24, 2026.
| Parameter | Flex AI Workout Trainer & Log | Boost |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (2.4K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 69.0% of reviews | — |
| Number of ratings | 2.4K — better | 1 |
| Update frequency | Every 9 days | Every 9 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, Apple Watch | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 574 MB | 43 MB |
| Age rating | 17+ | 4+ |
| Developer | Flex Artificial Intelligence Inc. | ALRAWAFED TRADING AND INVESTMENT, |
Bugs and requests
Flex AI Workout Trainer & Log
Reported bugs
3 issues- App crashes on iOS 16 update
- Inability to log workouts on previous days
- Inconsistent syncing between app and Apple Watch
Requested features
4 requests- Offline workout mode
- Ability to save and reuse custom workout plans
- Muscle group targeting and analytics
- Social features and community integration
Boost
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Flex AI Workout Trainer & Log
- Premium Subscription Monthly$12.991 Month
- Premium Plus Monthly$29.991 Month
- Premium Plus Family Monthly$69.991 Month
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- Premium Yearly Subscription$79.991 Year
- Premium Plus Yearly7 Days trial$191.991 Year
- Premium Plus Family Yearly7 Days trial$499.991 Year
- 1 Month Free PremiumFree
- Lifetime Free PremiumFree
Boost
- Boost Subscription7 Days trial$12.991 Month
Questions
Is Flex AI Workout Trainer & Log free?
Is Boost free?
Which has better reviews, Flex AI Workout Trainer & Log or Boost?
Do Flex AI Workout Trainer & Log or Boost have ads?
Which is updated more often, Flex AI Workout Trainer & Log or Boost?
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