Comparison

Flex AI Workout Trainer & Log vs CalGPT

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • AI personal trainer
  • Real-time form feedback
  • Personalized workout plans
  • Adaptive progression
  • Strength tracking
  • Community leaderboards
  • Apple Watch integration
Features
Read full description

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.

About

CalGPT

This AI-powered app simplifies calorie tracking by estimating nutritional information from photos or text descriptions. It offers personalized weight loss advice, weekly calorie balancing, and manual adjustments for ultimate control over your diet.

Highlights
  • AI calorie estimation from photos
  • Calorie calculation from text descriptions
  • Weekly calorie balance tracking
  • Personalized weight loss advice
  • Manual food and exercise adjustments
  • Extensive workout database
Features
Read full description

CalGPT: The Game-Changer for Weight Loss Are you tired of complicated calorie-tracking apps that make your weight loss journey even harder? CalGPT is here to simplify everything. Our AI agent accurately estimates calories from a single photo or a quick description—no more tedious manual logging! Effortless Calorie Tracking - Snap a photo of your meal, and CalGPT’s custom-trained AI instantly calculates calories, protein, fat, and carbs. It even recognizes multiple foods in one image. - Forgot to log your meal? Just type what you ate, and CalGPT will compute the calories from your description. No photo? No problem! Weekly Balance & Personalized Advice - Redistribute extra calories across the week while maintaining an overall balance. - Track your weight daily, and CalGPT will tailor weight loss advice to your unique profile, without requiring endless personal details. Manual Adjustments for Ultimate Control - Easily edit food portions and exercise durations if our AI estimates differ from reality. - Use our extensive workout database to add or adjust exercise calories based on your weight and age. Upcoming Features - Enhanced Exercise Functionality: Smart exercise timing and automatic calorie burn estimates for running, cycling, and walking. - Ingredient-Based Recipe Recommendations: CalGPT will recognize ingredients you already have and suggest healthy, low-calorie recipes tailored to your pantry. Why CalGPT? - AI-Powered: Instant, accurate calorie estimates. - Flexible: Photo or text input, plus weekly balance tracking. - Personalized: Real-time feedback on your food choices. - Future-Proof: Exciting updates like smart exercise timing and recipe suggestions are on the way! Join me on this journey toward a healthier, happier you. Download CalGPT now and take control of your weight loss today! By using this app, you agree to Apple's Standard License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Flex AI Workout Trainer & Log4 screens
CalGPT3 screens

Verdict

The call

The clearest difference is review sentiment: CalGPT at 100% against Flex AI Workout Trainer & Log's 69%. CalGPT also leads on rating (5.0 vs 4.6) and iOS requirement (15.1 vs 18.0). Flex AI Workout Trainer & Log's advantage is ratings volume (2.4K vs 2). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Flex AI Workout Trainer & Log sells 8 in-app purchases, starting at $12.99 per month and CalGPT sells 5 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

CalGPT 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 2, so its average is the more settled of the two. Written reviews point the same way: 69% of Flex AI Workout Trainer & Log's written reviews are positive against 100% of CalGPT's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 9 days. The most recent releases landed on October 20, 2026 and October 10, 2026 respectively.

Scorecard4 real differences · 6 level
Flex AI Workout Trainer & Log versus CalGPT: the parameters behind the verdict, then further details
ParameterFlex AI Workout Trainer & LogCalGPT
PriceFreeFree
Rating4.6 (2.4K ratings)5.0 (2 ratings) — better
Positive reviews69.0% of reviews100.0% of reviews — better
Number of ratings2.4K — better2
Update frequencyEvery 9 daysEvery 9 days
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, Apple WatchiPhone, iPod
Requires iOS18.015.1 — better
Further details — not scored
Size574 MB34 MB
Age rating17+4+
DeveloperFlex Artificial Intelligence Inc.Yong Li

Customer experience

Flex AI Workout Trainer & Log

All ratings2,412 ratings
Positive92.0%
Neutral2.6%
Negative5.4%
Written reviews310 reviews
Positive69.0%
Neutral6.5%
Negative24.5%

CalGPT

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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

CalGPT

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Flex AI Workout Trainer & Log

Subscriptions6
  • Premium Subscription Monthly$12.991 Month
  • Premium Plus Monthly$29.991 Month
  • Premium Plus Family Monthly$69.991 Month
Show 3 more
  • Premium Yearly Subscription$79.991 Year
  • Premium Plus Yearly7 Days trial$191.991 Year
  • Premium Plus Family Yearly7 Days trial$499.991 Year
One-time2
  • 1 Month Free PremiumFree
  • Lifetime Free PremiumFree
5 purchases

CalGPT

Subscriptions4
  • Premium Monthly$4.991 Month
  • Super Angel Semi-Annual$7.996 Months
  • Angel Annual Subscription$12.991 Year
Show 1 more
  • Premium Yearly$19.991 Year
One-time1
  • Lifetime Membership – CalGPT$19.99

Questions

Is Flex AI Workout Trainer & Log free?
Flex AI Workout Trainer & Log is free to download, with in-app purchases available.
Is CalGPT free?
CalGPT is free to download, with in-app purchases available.
Which has better reviews, Flex AI Workout Trainer & Log or CalGPT?
CalGPT is rated higher. Flex AI Workout Trainer & Log averages 4.6 out of 5 from 2.4K ratings, while CalGPT averages 5.0 from 2 ratings.
Do Flex AI Workout Trainer & Log or CalGPT have ads?
Neither Flex AI Workout Trainer & Log nor CalGPT shows ads.
Which is updated more often, Flex AI Workout Trainer & Log or CalGPT?
Flex AI Workout Trainer & Log ships an update every 9 days, and CalGPT every 9 days. Most recently, Flex AI Workout Trainer & Log was updated on October 20, 2026 and CalGPT on October 10, 2026.

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