Comparison

SimpleFit vs BuiltDiff

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

Head to head
About

SimpleFit

This app offers personalized, adaptive workout and nutrition plans based on your goals, schedule, and available equipment. It features an interactive player with video guides and extensive customization options for over 500 exercises.

Highlights
  • Personalized questionnaire for goal setting
  • Adaptive long-term workout programs
  • Flexible workouts tailored to daily needs
  • Interactive workout player with video/audio
  • Extensive exercise library (500+ exercises)
  • Personalized nutrition program
  • Detailed progress tracking
Features
Read full description

Welcome to SimpleFit, where your fitness aspirations meet personalized, adaptive training and nutritional guidance. Our app is designed to revolutionize your workout experience, tailoring every aspect to your individual goals and lifestyle. UNIQUE PERSONALIZATION THROUGH QUESTIONNAIRE - Start with our comprehensive questionnaire, designed to understand your fitness goals, be it muscle gain, weight loss, strength enhancement, mobility improvement, powerlifting, or calisthenics skills. - Tailor your workout environment to your training location and available equipment, whether it's a gym, home, traveling, or no-equipment scenarios. - Get nutritional guidance aligned with your dietary habits and goals. - Tell us your available schedule, and we craft a workout plan that fits perfectly into your life. ADAPTIVE LONG-TERM PROGRAM WITH PERIODIZATION - Engage in a dynamic, long-term workout program that uses periodization to focus on your goals. - As you progress, the program adapts, ensuring you always have challenging workouts. FLEXIBLE WORKOUTS TAILORED TO DAILY NEEDS - Adjust your workouts based on your daily location, available equipment, training duration, and preferences. - Select, swap, and reorder exercises to fit your needs for each session. INTERACTIVE WORKOUT PLAYER - Experience our workout player with video and audio instructions for each exercise. - Benefit from automated timers, track your weights and repetitions, and access quick form cues. - Edit, add, or reorder exercises during your workout for a customized experience. EXTENSIVE CUSTOMIZATION OPTIONS - Choose from over 500 exercises in our extensive library, each detailed with instructions and correct execution tips. - Enjoy full freedom to create and edit your workouts and workout program. PERSONALIZED NUTRITION PROGRAM - Receive recommendations on calorie intake and macro values, tailored to your fitness goals. - Access important information on nutrition to optimally fuel your body. DETAILED PROGRESS TRACKING - Track your progress with comprehensive statistics for every workout and exercise. - View detailed logs to monitor your advancement over time. Email: info@simple-fit.app Support: https://www.app.simple-fit.app/support Privacy Policy: https://www.simple-fit.app/privacy Terms of Service: https://www.simple-fit.app/tos

About

BuiltDiff

Log your weightlifting sets and reps with a clean, distraction-free interface. Visualize your progress with charts and personalize the app's appearance. Enjoy offline functionality and a sign-up-free experience for efficient workouts.

Highlights
  • Log lifts, sets, and reps
  • Create custom workout routines
  • Offline functionality
  • Sign-up-free experience
  • Visualize progress with charts
  • Personalize app appearance
Features
Read full description

Track your lifts, sets, and reps and watch your strength soar! Enjoy a clean and simple design that makes navigation a breeze. Focus on your workout without any distractions, making your lifting sessions efficient and effective. Features: - watchOS companion app - Tailor your own workout routines - No internet connection needed - Sign up-free experience - Convenient keyboard add-ons for efficient logging of weights and reps - Permanent recording of all your lifts - Visualize your lifting progression through charts - Select your preferred color and personalize the app to make it uniquely yours

Screenshots

SimpleFit4 screens
BuiltDiff4 screens

Verdict

The call

The clearest difference is in-app purchases: BuiltDiff at none against SimpleFit's 3. SimpleFit's advantage is ratings volume (49 vs 2) and iOS requirement (15.6 vs 17.0). On price, rating, update cadence 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. SimpleFit sells 3 in-app purchases, starting at $9.99 per month. BuiltDiff asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for SimpleFit against 5.0 for BuiltDiff. That said, the two scores are not equally well evidenced: SimpleFit has 49 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

SimpleFit ships an update fortnightly, BuiltDiff every 2 weeks. The most recent releases landed on September 8, 2026 and June 11, 2026 respectively.

Scorecard4 real differences · 6 level
SimpleFit versus BuiltDiff: the parameters behind the verdict, then further details
ParameterSimpleFitBuiltDiff
PriceFreeFree
Rating4.9 (49 ratings)5.0 (2 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings49 — better2
Update frequencyFortnightly — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, Apple Watch
Requires iOS15.6 — better17.0
Further details — not scored
Size224 MB3 MB
Age rating12+4+
DeveloperJonas WallmannTimmy Nguyen

Customer experience

SimpleFit

All ratings49 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews13 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

BuiltDiff

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

SimpleFit

Subscriptions3
  • Premium Monthly7 Days trial$9.991 Month
  • Premium 3 Months7 Days trial$24.993 Months
  • Premium Annual7 Days trial$69.991 Year
None

BuiltDiff

No in-app purchases

Questions

Is SimpleFit free?
SimpleFit is free to download, with in-app purchases available.
Is BuiltDiff free?
BuiltDiff is free to download, with no in-app purchases.
Which has better reviews, SimpleFit or BuiltDiff?
BuiltDiff is rated higher. SimpleFit averages 4.9 out of 5 from 49 ratings, while BuiltDiff averages 5.0 from 2 ratings.
Do SimpleFit or BuiltDiff have ads?
Neither SimpleFit nor BuiltDiff shows ads.
Which is updated more often, SimpleFit or BuiltDiff?
SimpleFit ships an update fortnightly, and BuiltDiff every 2 weeks. Most recently, SimpleFit was updated on September 8, 2026 and BuiltDiff on June 11, 2026.

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