# SimpleFit vs BuiltDiff

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.

Both are free to download. SimpleFit sells 3 in-app purchases, starting at $9.99 per month. BuiltDiff asks for nothing beyond the download.

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.

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

## The numbers

| Metric | SimpleFit | BuiltDiff |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (49 ratings)](https://appshunter.io/ios/app/simplefit-gym-workout-program/id6463613968/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/builtdiff/id6478643263/reviews)** |
| Number of ratings | **49** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Freemium | **Free** |
| Size | 224 MB | 3 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Jonas Wallmann](https://appshunter.io/developer/1489145519) | [Timmy Nguyen](https://appshunter.io/developer/1679678398) |

## What reviewers say

### SimpleFit

[App page](https://appshunter.io/ios/app/simplefit-gym-workout-program/id6463613968)

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:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $9.99 | per month |
| Premium 3 Months | $24.99 | per 3 months |
| Premium Annual | $69.99 | per year |


### BuiltDiff

[App page](https://appshunter.io/ios/app/builtdiff/id6478643263)

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:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*