# Physics! Fun vs Model Engine Builder

Physics! Fun and Model Engine Builder are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Physics! Fun sells 5 in-app purchases, starting at $4.99 per month and Model Engine Builder sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on September 22, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Physics! Fun | Model Engine Builder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/physics-fun/id6752563347/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 71 MB | 20 MB |
| Requires iOS | 16 | **15.6** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Ramazan Saglam](https://appshunter.io/developer/1839886393) | [MIN GYu OH](https://appshunter.io/developer/6803589847) |

## What reviewers say

### Physics! Fun

[App page](https://appshunter.io/ios/app/physics-fun/id6752563347)

Explore a realistic physics sandbox where you can build, break, and experiment with your own creations. Design complex machines, test structures, and manipulate gravity in an open-world environment. Frequent updates ensure endless creative possibilities.

**Highlights:** Realistic ragdoll physics, Dynamic particle and fluid simulations, Complex machine and structure building, Customizable gravity and environments, Intuitive building controls, Frequent content updates

**Features:** Family Sharing

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $4.99 | per month |
| Plus Yearly | $29.99 | per year |
| Small Block Package | $1.99 | one-time |
| Medium Block Package | $2.49 | one-time |
| Large Block Package | $2.99 | one-time |


### Model Engine Builder

[App page](https://appshunter.io/ios/app/model-engine-builder/id6803801661)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| removeads | $1.99 | one-time |


## Frequently asked questions

### Is Physics! Fun free?

Physics! Fun is free to download, with in-app purchases available.

### Is Model Engine Builder free?

Model Engine Builder is free to download, with in-app purchases available.

### Do Physics! Fun or Model Engine Builder have ads?

Both Physics! Fun and Model Engine Builder show ads.

### Which is updated more often, Physics! Fun or Model Engine Builder?

Physics! Fun ships an update every 2 weeks, and Model Engine Builder every 2 weeks. Most recently, Physics! Fun was updated on September 22, 2026 and Model Engine Builder on October 4, 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.*