Comparison

Flex AI Workout Trainer & Log vs Working Sets

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

Working Sets

Features
Read full description

~ A simpler way to track your Working Sets ~ Working Sets is a minimal and simple workout tracker designed for people looking to build muscle and make progressive size gains without the noise. Custom Templates and Progress Feedback • Working Sets deliberately doesn't contain presets or existing models, it's designed to work how you do without ads, privacy invasive activities or clutter. • You can sync with Health to read health data and save workouts without the need for a wearable. • Working Sets learns about your activity securely, on-device, and shows you how much stronger you are week-to-week. Suggested Sets, Simple Summaries and Calendar Progress • During your workout, any exercise that contains three sets of at least 8 reps at a certain weight will generate a suggested increment of weight for that rep range. If your reps aren't quite at 8 but you've hit the same weight at a few different rep ranges, Working Sets will recommend based on an average. • Post-workout you'll get a summary which showcases any PRs for that session and your max weight and max rep range per-exercise. • From the main home view you can see your workouts for the month at a glance. Simple! Home Screen Widgets, Live Activities and Customisation • Customise basic settings such as which days you work out, what day you consider the start of the week, your average rest time, the app's accent colour and which app icon you prefer. • Also launch Working Sets from your home screen with useful widgets that show either your schedule for the day/week, or your last working session. Apple Watch • If you use Apple Watch, you’ll now be able to install the companion app to see your current working set, update the weight/reps and complete it all without looking at your phone. Premium Features • Set weekly workout commitments and track your progress toward your goals with visual feedback • Celebrate reaching your weekly workout targets with visual rewards and progress tracking • Get detailed workout analysis that compares your current performance to previous sessions • Assign muscle groups to exercises and track which areas you're targeting most • Premium subscriptions available monthly or yearly with significant savings on annual plans Full terms of service available at https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Flex AI Workout Trainer & Log4 screens
Working Sets4 screens

Verdict

The call

The clearest difference is iOS requirement: Flex AI Workout Trainer & Log at 18.0 against Working Sets's 27.0. 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 Working Sets sells 5 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Flex AI Workout Trainer & Log ships an update every 9 days, Working Sets weekly. The most recent releases landed on October 12, 2026 and October 1, 2026 respectively.

Scorecard1 real difference · 9 level
Flex AI Workout Trainer & Log versus Working Sets: the parameters behind the verdict, then further details
ParameterFlex AI Workout Trainer & LogWorking Sets
PriceFreeFree
Rating4.6 (2.4K ratings) — better—
Positive reviews69.0% of reviews—
Number of ratings2.4K — better—
Update frequencyEvery 9 daysWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, Apple WatchiPhone, iPad
Requires iOS18.0 — better27.0
Further details — not scored
Size574 MB11 MB
Age rating17+4+
DeveloperFlex Artificial Intelligence Inc.Karl Koch

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

Working Sets

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

Working Sets

Subscriptions2
  • Working Sets Monthly Premium$2.991 Month
  • Working Sets Yearly Premium$22.991 Year
One-time3
  • Tip 1$0.99
  • Tip 2$2.99
  • Tip 3$5.99

Questions

Is Flex AI Workout Trainer & Log free?
Flex AI Workout Trainer & Log is free to download, with in-app purchases available.
Is Working Sets free?
Working Sets is free to download, with in-app purchases available.
Do Flex AI Workout Trainer & Log or Working Sets have ads?
Neither Flex AI Workout Trainer & Log nor Working Sets shows ads.
Which is updated more often, Flex AI Workout Trainer & Log or Working Sets?
Flex AI Workout Trainer & Log ships an update every 9 days, and Working Sets weekly. Most recently, Flex AI Workout Trainer & Log was updated on October 12, 2026 and Working Sets on October 1, 2026.

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