Comparison

Flex AI Workout Trainer & Log vs Dopamine Strength

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

Dopamine Strength

Features
Read full description

With the Dopamine Strength App, you can start tracking your workouts and meals, measuring results, and achieving your fitness goals, all with the help of your personal trainer. - Access your gym membership pass - Book appointments and view session balance - Edit personal information and view membership details - Stay up-to-date with announcements from your club - Review training plans and track workouts - Schedule workouts and stay committed by beating your personal bests - Track progress towards your goals - Manage your nutrition intake as prescribed by your coach - Set health and fitness goals - Message your coach in real-time - Track body measurements and take progress photos - Get push notification reminders for scheduled workouts and activities - Connect to wearable devices like Apple Watch (synced to Health app), Fitbit and Withings to sync body stats instantly Download the app today!

Screenshots

Flex AI Workout Trainer & Log4 screens
Dopamine Strength4 screens

Verdict

The call

The clearest difference is in-app purchases: Dopamine Strength at none against Flex AI Workout Trainer & Log's 8. Dopamine Strength also leads on device support (4 vs 2) and iOS requirement (15.5 vs 18.0). Flex AI Workout Trainer & Log's advantage is update cadence (every 9 days vs every 5 weeks). On price and ads 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. Dopamine Strength asks for nothing beyond the download.

UpkeepUpdate frequency

Flex AI Workout Trainer & Log ships an update every 9 days, Dopamine Strength every 5 weeks. The most recent releases landed on October 29, 2026 and October 20, 2026 respectively.

Scorecard4 real differences · 6 level
Flex AI Workout Trainer & Log versus Dopamine Strength: the parameters behind the verdict, then further details
ParameterFlex AI Workout Trainer & LogDopamine Strength
PriceFreeFree
Rating4.6 (2.4K ratings) — better—
Positive reviews69.0% of reviews—
Number of ratings2.4K — better—
Update frequencyEvery 9 days — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, Apple WatchiPhone, iPad, iPod, Apple Watch — better
Requires iOS18.015.5 — better
Further details — not scored
Size574 MB166 MB
Age rating17+4+
DeveloperFlex Artificial Intelligence Inc.Dopamine Strength Corporation

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

Dopamine Strength

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
None

Dopamine Strength

No in-app purchases

Questions

Is Flex AI Workout Trainer & Log free?
Flex AI Workout Trainer & Log is free to download, with in-app purchases available.
Is Dopamine Strength free?
Dopamine Strength is free to download, with no in-app purchases.
Do Flex AI Workout Trainer & Log or Dopamine Strength have ads?
Neither Flex AI Workout Trainer & Log nor Dopamine Strength shows ads.
Which is updated more often, Flex AI Workout Trainer & Log or Dopamine Strength?
Flex AI Workout Trainer & Log ships an update every 9 days, and Dopamine Strength every 5 weeks. Most recently, Flex AI Workout Trainer & Log was updated on October 29, 2026 and Dopamine Strength on October 20, 2026.

Other comparisons