Comparison

Flex AI Workout Trainer & Log vs GymWiz

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

GymWiz

This app uses AI to create personalized fitness plans based on your goals and body scan. Generate hundreds of unique workouts to help you transform your body efficiently and confidently.

Highlights
  • AI-generated fitness plans
  • Body scanning for personalization
  • Hundreds of unique workout variations
  • Goal setting
  • Progress tracking
Features
Read full description

Turn creator Reels and TikToks into workouts you can actually train. How to use GymWiz: 1) Share a workout video from Instagram or TikTok to GymWiz 2) GymWiz extracts the exercises, sets, and reps 3) Save it to your library and schedule it in your planner 4) Train with a clear session — track muscles as you go GymWiz is built for creator workouts: the routines you already follow, organized so you can train them with structure. Discover suggested sessions, build your library, and follow along set by set. If you have ideas or questions, email manny@zstackcapital.com NOTE: We do not offer medical advice. Any and all recommendations should be viewed as suggestions — please consult a professional and do your own research before trying a new training plan. *SOME FEATURES REQUIRE A SUBSCRIPTION. TERMS: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Flex AI Workout Trainer & Log4 screens
GymWiz4 screens

Verdict

The call

The clearest difference is rating: Flex AI Workout Trainer & Log at 4.6 against GymWiz's 4.2. Flex AI Workout Trainer & Log also leads on ratings volume (2.4K vs 5). GymWiz's advantage is review sentiment (100% vs 69%). 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 6 in-app purchases, starting at $12.99 per month and GymWiz sells 2 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Flex AI Workout Trainer & Log holds the better App Store score, 4.6 against 4.2. That said, the two scores are not equally well evidenced: Flex AI Workout Trainer & Log has 2.4K ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 69% of Flex AI Workout Trainer & Log's written reviews are positive against 100% of GymWiz's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Flex AI Workout Trainer & Log ships an update every 9 days, GymWiz every 2 weeks. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 7 level
Flex AI Workout Trainer & Log versus GymWiz: the parameters behind the verdict, then further details
ParameterFlex AI Workout Trainer & LogGymWiz
PriceFreeFree
Rating4.6 (2.4K ratings) — better4.2 (5 ratings)
Positive reviews69.0% of reviews100.0% of reviews — better
Number of ratings2.4K — better5
Update frequencyEvery 9 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS18.017.6 — better
Further details — not scored
Size574 MB132 MB
Age rating17+4+
DeveloperFlex Artificial Intelligence Inc.ZSTACK CAPITAL LLC

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%

GymWiz

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
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

GymWiz

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 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
2 purchases

GymWiz

Subscriptions2
  • GymWiz Plus$3.997 Days
  • Get Fit AI Gym Workout Plus3 Days trial$6.997 Days

Questions

Is Flex AI Workout Trainer & Log free?
Flex AI Workout Trainer & Log is free to download, with in-app purchases available.
Is GymWiz free?
GymWiz is free to download, with in-app purchases available.
Which has better reviews, Flex AI Workout Trainer & Log or GymWiz?
Flex AI Workout Trainer & Log is rated higher. Flex AI Workout Trainer & Log averages 4.6 out of 5 from 2.4K ratings, while GymWiz averages 4.2 from 5 ratings.
Do Flex AI Workout Trainer & Log or GymWiz have ads?
Neither Flex AI Workout Trainer & Log nor GymWiz shows ads.
Which is updated more often, Flex AI Workout Trainer & Log or GymWiz?
Flex AI Workout Trainer & Log ships an update every 9 days, and GymWiz every 2 weeks. Most recently, Flex AI Workout Trainer & Log was updated on November 2, 2026 and GymWiz on October 30, 2026.

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