# RADS4KIDS vs Model Constructor 3D

The clearest difference is review sentiment: Model Constructor 3D at 100% against RADS4KIDS's 50%. Model Constructor 3D also leads on update cadence (every 2 months vs every 22 months) and ratings volume (25 vs 2). RADS4KIDS's advantage is ads (none vs shown) and rating (4.0 vs 3.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

RADS4KIDS holds the better App Store score, 4.0 against 3.6. That said, the two scores are not equally well evidenced: Model Constructor 3D has 25 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 50% of RADS4KIDS's written reviews are positive against 100% of Model Constructor 3D's, so the app with the better star average is not the one people write more warmly about.

RADS4KIDS ships an update every 22 months, Model Constructor 3D every 2 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | RADS4KIDS | Model Constructor 3D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/rads4kids/id1000774112/reviews)** | [3.6 (25 ratings)](https://appshunter.io/ios/app/model-constructor-3d/id1436938843/reviews) |
| Number of ratings | 2 | **25** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 22 months | **Every 2 months** |
| Monetization | **Free** | Ad-supported |
| Size | 101 MB | 294 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Primera World Marketing](https://appshunter.io/developer/443181448) | [Ben Walker](https://appshunter.io/developer/385443776) |

## What reviewers say

### RADS4KIDS

[App page](https://appshunter.io/ios/app/rads4kids/id1000774112)

This app provides a creative and illustrative guide for children and parents preparing for radiation therapy. It includes explanations, an engaging game, a storybook in English and French, and a calendar to track feelings.

**Highlights:** Radiation therapy explanation, Original entertaining game, FAQ for teens and parents, Storybook in English and French, Calendar to record feelings

**Features:** macOS Compatibility

**In-app purchases:** none


### Model Constructor 3D

[App page](https://appshunter.io/ios/app/model-constructor-3d/id1436938843)

Assemble realistic plastic models part by part in this engaging puzzle game. Learn how components fit together through intuitive drag-and-drop mechanics. Enjoy different difficulty modes, customize completed models, and compete on global leaderboards.

**Highlights:** Realistic plastic model assembly, Drag-and-drop part snapping, Easy and Hard puzzle modes, Model customization (color, animations), 360-degree model viewing, Global leaderboards

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

**In-app purchases:** none


## Frequently asked questions

### Is RADS4KIDS free?

RADS4KIDS is free to download, with no in-app purchases.

### Is Model Constructor 3D free?

Model Constructor 3D is free to download, with no in-app purchases.

### Which has better reviews, RADS4KIDS or Model Constructor 3D?

RADS4KIDS is rated higher. RADS4KIDS averages 4.0 out of 5 from 2 ratings, while Model Constructor 3D averages 3.6 from 25 ratings.

### Do RADS4KIDS or Model Constructor 3D have ads?

Model Constructor 3D shows ads; RADS4KIDS does not.

### Which is updated more often, RADS4KIDS or Model Constructor 3D?

RADS4KIDS ships an update every 22 months, and Model Constructor 3D every 2 months. Most recently, RADS4KIDS was updated on November 1, 2026 and Model Constructor 3D on November 2, 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.*