# Grace 4 vs 3D Rat Anatomy

The clearest difference is price: 3D Rat Anatomy at $12.99 against Grace 4's $39.99. 3D Rat Anatomy also leads on review sentiment (100% vs 56%) and rating (4.8 vs 4.5). Grace 4's advantage is update cadence (every 8 months vs every 28 months) and ratings volume (45 vs 4). On ads, in-app purchases, monetization model and device support there is nothing between them.

Grace 4 costs $39.99 and 3D Rat Anatomy $12.99 up front. Neither carries in-app purchases, so what you see is what you pay.

3D Rat Anatomy holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Grace 4 has 45 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 56% of Grace 4's written reviews are positive against 100% of 3D Rat Anatomy's.

Grace 4 ships an update every 8 months, 3D Rat Anatomy every 28 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Grace 4 | 3D Rat Anatomy |
| --- | --- | --- |
| Price | $39.99 | **$12.99** |
| Rating | [4.5 (45 ratings)](https://appshunter.io/ios/app/grace-4/id360574688/reviews) | **[4.8 (4 ratings)](https://appshunter.io/ios/app/3d-rat-anatomy/id1038258757/reviews)** |
| Number of ratings | **45** | 4 |
| Positive reviews | 55.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 28 months |
| Monetization | Paid | Paid |
| Size | 17 MB | 142 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Steven Troughton-Smith](https://appshunter.io/developer/286133549) | [Biosphera](https://appshunter.io/developer/569303204) |

## What reviewers say

### Grace 4

[App page](https://appshunter.io/ios/app/grace-4/id360574688)

This app facilitates communication for individuals with speech disabilities using a picture exchange system. Users can select images to build sentences, share them with communication partners, and customize content with their own photos and labels. It supports vocal output and offers adjustable settings for various needs.

**Highlights:** Picture exchange communication, Customizable image library, Sentence strip creation, Optional vocal output, Fullscreen sentence view, Adjustable card sizes

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use interface
- 💡 Great for visual learners
- 👍 Flexible customization options
- 👍 Useful for non-verbal individuals
- 👍 Good PECS alternative

**What reviewers complain about**

- 👎 Lacks voice output
- 👎 Limited built-in content
- 👎 High price for functionality
- 👎 Not user-friendly for some
- 👎 Can be confusing initially

**Reported bugs**

- App flashing on and off
- App closes unexpectedly
- Cannot see pictures when clicking icon headers
- Imported pictures show on top of each other
- Issues with adding own categories

**Requested features**

- Ability to record own voice
- Add own categories
- Remove existing categories
- More cards/images
- Add own cards to existing categories


### 3D Rat Anatomy

[App page](https://appshunter.io/ios/app/3d-rat-anatomy/id1038258757)

Explore the detailed internal anatomy of a lab rat with an interactive 3D model. Visualize and manipulate bones, muscles, and organ systems layer by layer. This educational tool is available in multiple languages.

**Highlights:** Interactive 3D rat anatomy model, Layer-by-layer visualization, Highlight and remove structures, Multiple language support, Zoom functionality

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Grace 4 free?

Grace 4 costs $39.99, with no in-app purchases.

### Is 3D Rat Anatomy free?

3D Rat Anatomy costs $12.99, with no in-app purchases.

### Which has better reviews, Grace 4 or 3D Rat Anatomy?

3D Rat Anatomy is rated higher. Grace 4 averages 4.5 out of 5 from 45 ratings, while 3D Rat Anatomy averages 4.8 from 4 ratings.

### Do Grace 4 or 3D Rat Anatomy have ads?

Neither Grace 4 nor 3D Rat Anatomy shows ads.

### Which is updated more often, Grace 4 or 3D Rat Anatomy?

Grace 4 ships an update every 8 months, and 3D Rat Anatomy every 28 months. Most recently, Grace 4 was updated on October 23, 2026 and 3D Rat Anatomy on October 24, 2026.

---

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