Comparison

Flex AI Workout Trainer & Log vs Apex

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

Apex

Features
Read full description

Tell Apex what you want to train and it writes the workout. Log every set on your iPhone or straight from your Apple Watch. Free, with no subscription and no ads. AI THAT WRITES YOUR WORKOUT • Type it or say it: "45 minutes, heavy legs, dumbbells only" • Get a full session in seconds, with sets and reps ready to log • Add or remove exercises before you start • Got a program from a coach or a chatbot? Paste it in and Apex turns it into a plan you can follow LOG FROM YOUR WRIST (NEW) • Open a workout on iPhone and it's already on your Apple Watch • Turn the Digital Crown to dial weight, reps, or time, then tap Log • Last session's numbers sit right there, so you know what to beat • Your rest starts on its own and taps your wrist when it's time to lift • Complications and the Smart Stack show your rest and next set at a glance • See heart rate and calories live, and save workouts to Apple Health A PLAN BUILT AROUND YOU • Answer 5 quick questions and get matched to a program for your goal, experience, equipment, and schedule • Programs for strength, muscle, fat loss, conditioning, home dumbbells, kettlebells, and bodyweight • Or build your own plan, week by week, from 270+ exercises • Freestyle mode for the days you just want to train TRACK EVERY REP • Weight and reps, reps only, time, or distance, set by set • Supersets and circuits built in • Rest timer on your Lock Screen and in the Dynamic Island • New personal records celebrated the moment you hit them • Strength charts and your full workout history • Share a clean workout card when you hit a milestone YOURS, NO STRINGS • Free to use: no subscription, no paywall, no ads • Export your workout data any time • Your account works on the web at myapex.fit too Download Apex and let your next workout write itself.

Screenshots

Flex AI Workout Trainer & Log4 screens
Apex4 screens

Verdict

The call

The clearest difference is in-app purchases: Apex at none against Flex AI Workout Trainer & Log's 8. Apex also leads on update cadence (every 3 days vs every 9 days) and iOS requirement (15.1 vs 18.0). On price, ads and device support 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. Apex asks for nothing beyond the download.

UpkeepUpdate frequency

Flex AI Workout Trainer & Log ships an update every 9 days, Apex every 3 days. The most recent releases landed on October 20, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 7 level
Flex AI Workout Trainer & Log versus Apex: the parameters behind the verdict, then further details
ParameterFlex AI Workout Trainer & LogApex
PriceFreeFree
Rating4.6 (2.4K ratings) — better—
Positive reviews69.0% of reviews—
Number of ratings2.4K — better—
Update frequencyEvery 9 daysEvery 3 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, Apple WatchiPhone, iPod, Apple Watch — better
Requires iOS18.015.1 — better
Further details — not scored
Size574 MB38 MB
Age rating17+4+
DeveloperFlex Artificial Intelligence Inc.EDMUND SILVA NOPUENTE

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

Apex

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

Apex

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 Apex free?
Apex is free to download, with no in-app purchases.
Do Flex AI Workout Trainer & Log or Apex have ads?
Neither Flex AI Workout Trainer & Log nor Apex shows ads.
Which is updated more often, Flex AI Workout Trainer & Log or Apex?
Flex AI Workout Trainer & Log ships an update every 9 days, and Apex every 3 days. Most recently, Flex AI Workout Trainer & Log was updated on October 20, 2026 and Apex on October 3, 2026.

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