Comparison

HASfit vs Flex AI Workout Trainer & Log

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

Head to head
About

HASfit

Access over 1,000 on-demand home workout routines and exercise plans for all fitness levels and goals. Follow complete fitness programs for faster results, download videos for offline use, and stream workouts to your TV. Customize routines and discover new workouts added weekly.

Highlights
  • Over 1,000 on-demand home workout routines
  • Exercise plans for all fitness levels
  • Download videos for offline viewing
  • Stream workouts to TV
  • Customizable workout modifications
  • New workouts added weekly
Features
Read full description

It’s like having a personal trainer in your pocket! Join Coach Kozak and Claudia through over 1,000 on-demand home workout routines and exercise plans for all goals. • Named “Top Fitness App” for 10 years straight • 99% approval rating on over 1 Billion completed workouts Become the best version of you with… • Home workout routines for all fitness levels (limited mobility, seniors, beginner, intermediate, advanced) • Get up to 2x faster results by following a complete fitness plan and home workout program • Download videos for offline viewing • Stream your workouts to your TV using your Chromecast, Roku, Amazon Fire, or AppleTV • Search to find your perfect workout from 3 – 60 minutes • Modifications to help you customize the workout for your specific needs • Save your favorite routines for easy access later • Exercise with dumbbells or no equipment Discover new workouts added each week • Fat Burning Weight Loss • HIIT & Tabata • Muscle Building • Cardio • Strength Training • Low Impact • Kickboxing and MMA • Kettlebell • Flexibility and Yoga Featured on BBC, NBC, ABC, Women’s Health, National Institutes of Health (NIH), Men’s Health, and more Proven Complete Workout Plans and Programs • Foundation (Beginner): Start your fitness journey with this beginner workout program. The 30 day calendar updates each month with new workouts so you never get bored! Coach Kozak’s routines will get you in the best shape of your life using workouts that can be done anywhere, anytime. • Motive (Intermediate-Advanced): The 30 day schedule updates with new workout routines every month so you never get bored! HASfit’s Motive mixes it up with HIIT, cardio, weight training, calisthenics, martial arts, power yoga, and more to help you avoid plateaus and achieve optimum results. • Muscle Building: If you’re looking for an easy to follow home bodybuilding calendar, then here it is. Resistance training is the best way to gain strength and reshape your physique by building muscle and burning unwanted body fat at the same time. • 30 Day Ab Challenge: Did you know it takes more than just crunches to achieve the coveted six-pack? This 30 day ab workout challenge is designed to blast each of your abdominal muscle groups to reveal flatter and more defined abs. • And more! Testimonials: “My results just one year later and I have gotten 138 pounds off! (so far! just a little more to go) Woo Hoo! Thank you both so much Coach Kozak and Miss Claudia for these amazing workout videos! “I started the HASfit workout programs of months ago and have to say this is as good as any classes and personal trainer sessions at the gym! Who says you need to go to the gym to build muscle? Its so great to be able to work out at home and be challenged, pushed and motivated by these workouts and exercise plans. The variety of the workouts in in each plan is brilliant as means you don't get bored or plateau doing the same workout plans all the time. These are the best home workouts I have ever done. I recommend them to anyone, whatever your fitness level they seem to have all basis covered!,” Greg C. In App Subscription Information: HASfit Subscription One Month – No Ads operates on a 30 day cycle and is $6.99 per month. HASfit Subscription One Year - No Ads operates on a 365 day cycle and is $49.99 per 12 months. Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. You may manage your subscriptions and auto-renewal may be turned off by going to your user account settings after purchase. No cancellation of the current subscription is allowed during an active subscription period. Any unused portion of a free trial period will be forfeited when you purchase a subscription to HASfit Subscription One Month. Terms of use: http://hasfit.com/terms-of-service

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.

Screenshots

HASfit4 screens
Flex AI Workout Trainer & Log4 screens

Verdict

The call

The clearest difference is ads: Flex AI Workout Trainer & Log at none against HASfit's shown. HASfit's advantage is review sentiment (93% vs 69%) and rating (4.9 vs 4.6). On price, ratings volume, update cadence 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. HASfit sells 2 in-app purchases, starting at $6.99 per month and Flex AI Workout Trainer & Log sells 8 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

HASfit holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 7.1K and 2.4K respectively. Written reviews point the same way: 93% of HASfit's written reviews are positive against 69% of Flex AI Workout Trainer & Log's.

UpkeepUpdate frequency

HASfit ships an update fortnightly, Flex AI Workout Trainer & Log every 9 days. The most recent releases landed on October 16, 2026 and October 17, 2026 respectively.

Scorecard4 real differences · 6 level
HASfit versus Flex AI Workout Trainer & Log: the parameters behind the verdict, then further details
ParameterHASfitFlex AI Workout Trainer & Log
PriceFreeFree
Rating4.9 (7.1K ratings) — better4.6 (2.4K ratings)
Positive reviews93.0% of reviews — better69.0% of reviews
Number of ratings7.1K — better2.4K
Update frequencyFortnightlyEvery 9 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS15.6 — better18.0
Further details — not scored
Size87 MB574 MB
Age rating4+17+
DeveloperHASFitFlex Artificial Intelligence Inc.

Customer experience

HASfit

All ratings7,129 ratings
Positive97.7%
Neutral0.8%
Negative1.5%
Written reviews587 reviews
Positive93.0%
Neutral2.9%
Negative4.1%

Flex AI Workout Trainer & Log

All ratings2,409 ratings
Positive91.9%
Neutral2.6%
Negative5.4%
Written reviews310 reviews
Positive69.0%
Neutral6.5%
Negative24.5%

User reviews

HASfit

From 7.1K App Store ratings

What we love

  • 🚀 Fantastic home workout app
  • 👍 Great Workout Videos
  • 👍 Effective and fun workout programs
  • 👍 Great for Seniors
  • 👍 They are the best

Room to improve

  • 🐛 Clunky on IPad
  • 🐛 Frustrating Pop-Ups
  • 🐛 Cannot login

Flex AI Workout Trainer & Log

From 2.4K App Store ratings

What we love

  • 🚀 Detailed workout tracking
  • 👍 Customizable workouts
  • 🔒 Comprehensive exercise library
  • 💡 Helpful progress tracking
  • 👍 Clean and intuitive interface

Room to improve

  • 🐛 Glitches and bugs
  • 💰 Expensive premium subscription
  • 🔒 Limited functionality without premium
  • 🐛 Inconsistent rest timer
  • 🐛 Workout data loss

Bugs and requests

HASfit

Reported bugs

2 issues
  • App crashes on loading
  • Email verification not working

Requested features

4 requests
  • 10 min diastasis recti recovery suggestion
  • Landscape mode
  • Personal calendar to track workouts
  • Ability to pause, rewind, and fast forward videos

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

In-app purchases

2 purchases

HASfit

Subscriptions2
  • HASfit Subscription One Month7 Days trial$6.991 Month
  • HASfit Subscription One Year7 Days trial$49.991 Year
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

Questions

Is HASfit free?
HASfit is free to download, with in-app purchases available.
Is Flex AI Workout Trainer & Log free?
Flex AI Workout Trainer & Log is free to download, with in-app purchases available.
Which has better reviews, HASfit or Flex AI Workout Trainer & Log?
HASfit is rated higher. HASfit averages 4.9 out of 5 from 7.1K ratings, while Flex AI Workout Trainer & Log averages 4.6 from 2.4K ratings.
Do HASfit or Flex AI Workout Trainer & Log have ads?
HASfit shows ads; Flex AI Workout Trainer & Log does not.
Which is updated more often, HASfit or Flex AI Workout Trainer & Log?
HASfit ships an update fortnightly, and Flex AI Workout Trainer & Log every 9 days. Most recently, HASfit was updated on October 16, 2026 and Flex AI Workout Trainer & Log on October 17, 2026.

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