# ThirdCatheter vs 3D解剖学アトラス：iRis

The clearest difference is price: ThirdCatheter at $1.99 against 3D解剖学アトラス：iRis's $40.99. ThirdCatheter also leads on review sentiment (100% vs 60%) and update cadence (every 5 days vs every 44 months). 3D解剖学アトラス：iRis's advantage is in-app purchases (none vs 3) and iOS requirement (12.0 vs 26.0). On ads and device support there is nothing between them.

ThirdCatheter costs $1.99 and 3D解剖学アトラス：iRis $40.99 up front. ThirdCatheter sells 3 in-app purchases, starting at $0.49 per month. 3D解剖学アトラス：iRis asks for nothing beyond the download.

ThirdCatheter ships an update every 5 days, 3D解剖学アトラス：iRis every 44 months. The most recent releases landed on October 9, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | ThirdCatheter | 3D解剖学アトラス：iRis |
| --- | --- | --- |
| Price | **$1.99** | $40.99 |
| Positive reviews | **100.0% of reviews** | 60.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 44 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 28 MB | 491 MB |
| Requires iOS | 26.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Masaaki Hirata](https://appshunter.io/developer/942972055) | [株式会社Kompath](https://appshunter.io/developer/1230446483) |

## What reviewers say

### ThirdCatheter

[App page](https://appshunter.io/ios/app/thirdcatheter/id1209823996)

This medical reference tool calculates the theoretical minimum diameter for guiding catheters when using three devices. It offers device data pre-installed in new versions and advanced features like net search and gap imaging evaluation in the paid version. Users are advised to consult device manuals for strategy planning.

**Highlights:** Minimum diameter calculation for guiding catheters, Pre-installed device data, Net search and gap imaging evaluation (paid), Device information sharing via AirDrop, Device data editing with CatheterEditor, Calculates space needed for device function

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month Device Data Use | $0.49 | per month |
| 6 months Device Data Use | $1.99 | per 6 months |
| Fine-tune and save device info. | $1.99 | one-time |


### 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


## Frequently asked questions

### Is ThirdCatheter free?

ThirdCatheter costs $1.99, and also offers in-app purchases.

### 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.

### Do ThirdCatheter or 3D解剖学アトラス：iRis have ads?

Neither ThirdCatheter nor 3D解剖学アトラス：iRis shows ads.

### Which is updated more often, ThirdCatheter or 3D解剖学アトラス：iRis?

ThirdCatheter ships an update every 5 days, and 3D解剖学アトラス：iRis every 44 months. Most recently, ThirdCatheter was updated on October 9, 2026 and 3D解剖学アトラス：iRis on October 8, 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.*