# 3D解剖学アトラス：iRis vs CT PassQuiz Head/Brain / MRI

The clearest difference is review sentiment: 3D解剖学アトラス：iRis at 60% against CT PassQuiz Head/Brain / MRI's 0%. CT PassQuiz Head/Brain / MRI's advantage is price ($4.99 vs $40.99) and update cadence (fortnightly vs every 44 months). On ads, in-app purchases and device support there is nothing between them.

3D解剖学アトラス：iRis costs $40.99 and CT PassQuiz Head/Brain / MRI $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

3D解剖学アトラス：iRis ships an update every 44 months, CT PassQuiz Head/Brain / MRI fortnightly. Both last shipped on October 29, 2026.

## The numbers

| Metric | 3D解剖学アトラス：iRis | CT PassQuiz Head/Brain / MRI |
| --- | --- | --- |
| Price | $40.99 | **$4.99** |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 44 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 491 MB | 139 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [株式会社Kompath](https://appshunter.io/developer/1230446483) | [Kazuya Takayama](https://appshunter.io/developer/1115207317) |

## What reviewers say

### 3D解剖学アトラス：iRis

[App page](https://appshunter.io/ios/app/3diris/id1230446484)

A detailed 3D anatomical atlas for medical professionals, offering high-definition models and search functionality. Explore intricate anatomical details, including fine nerves and vascular structures, for enhanced learning and education.

**Highlights:** High-definition 3D anatomical models, Searchable anatomical information, Model visibility controls, Cross-section visualization, Key atlas for critical anatomy

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

**In-app purchases:** none


### CT PassQuiz Head/Brain / MRI

[App page](https://appshunter.io/ios/app/ct-passquiz-headbrain-mri/id1524292397)

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

**In-app purchases:** none


## Frequently asked questions

### Is 3D解剖学アトラス：iRis free?

3D解剖学アトラス：iRis costs $40.99, with no in-app purchases.

### Is CT PassQuiz Head/Brain / MRI free?

CT PassQuiz Head/Brain / MRI costs $4.99, with no in-app purchases.

### Do 3D解剖学アトラス：iRis or CT PassQuiz Head/Brain / MRI have ads?

Neither 3D解剖学アトラス：iRis nor CT PassQuiz Head/Brain / MRI shows ads.

### Which is updated more often, 3D解剖学アトラス：iRis or CT PassQuiz Head/Brain / MRI?

3D解剖学アトラス：iRis ships an update every 44 months, and CT PassQuiz Head/Brain / MRI fortnightly. Most recently, 3D解剖学アトラス：iRis was updated on October 29, 2026 and CT PassQuiz Head/Brain / MRI on October 29, 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.*