Comparison

Simple Fit vs Flex3

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

Head to head
About

Simple Fit

Access qualified trainers and a unique exercise base to create personalized workout plans. Achieve your fitness goals with expert guidance and tailored programs.

Highlights
  • Qualified trainers and Fit-coaches
  • Unique exercise base
  • Individual training plans
  • Goal-oriented coaching
  • Home and gym workouts
Features
Read full description

Simple Fit puts a personal trainer right in your pocket. Custom programs, live chat with your coach, and results you can actually see. No generic “one-size-fits-all” routines — just a plan built around your goals, experience, and equipment. WHAT'S INSIDE • A personal trainer online — up to 5× cheaper than an offline gym coach • Real-time chat with your trainer: ask, get an answer right away • An individual plan for your goal, not a preset from the internet • Train at home or in the gym — with any equipment, or none • Progress, stats, and reminders so you never quit YOUR GOAL, OUR PLAN • lose weight or build muscle • gain strength and endurance • recover after pregnancy or injury • simply stay in shape Beginner or seasoned athlete — your trainer adapts the load to you and guides you session by session, based on your real results. FOR TRAINERS Simple Fit means more clients and less routine. Coach your athletes online, move offline clients into the app, track their progress, and get reminders. Easy payouts and clear stats — earn from what you do best. Our mission is to bring the best trainers and the most driven athletes together on one platform, so everyone gets the most out of fitness. Learn more: simplefit.app Download Simple Fit and take a step toward a better you — today.

About

Flex3

Features
Read full description

Flex3 is the go to app for all fitness trainer looking to enhance their clients' experience with classes. With over 80+ workouts with detailed instructions, Flex3 gives trainers and clients a rich set of easy to use features. Flex3 also aids progress tracking and helps solve consistency problems.Watch your clients' hard work pay off! Track their progress effortlessly through detailed metrics, and milestones. Celebrate achievements and stay focused on thier journey to a stronger and fitter.

Screenshots

Simple Fit4 screens
Flex33 screens

Verdict

The call

The clearest difference is ads: Flex3 at none against Simple Fit's shown. Flex3 also leads on iOS requirement (12.0 vs 15.0). On price, update cadence, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Simple Fit ships an update every 3 weeks, Flex3 every 5 weeks. The most recent releases landed on September 20, 2026 and May 28, 2026 respectively.

Scorecard2 real differences · 8 level
Simple Fit versus Flex3: the parameters behind the verdict, then further details
ParameterSimple FitFlex3
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 weeks — betterEvery 5 weeks
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.012.0 — better
Further details — not scored
Size110 MB29 MB
Age rating17+17+
DeveloperFITNESS I TOCHKAAravind Athreya

In-app purchases

None

Simple Fit

No in-app purchases

None

Flex3

No in-app purchases

Questions

Is Simple Fit free?
Simple Fit is free to download, with no in-app purchases.
Is Flex3 free?
Flex3 is free to download, with no in-app purchases.
Do Simple Fit or Flex3 have ads?
Simple Fit shows ads; Flex3 does not.
Which is updated more often, Simple Fit or Flex3?
Simple Fit ships an update every 3 weeks, and Flex3 every 5 weeks. Most recently, Simple Fit was updated on September 20, 2026 and Flex3 on May 28, 2026.

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