# RBCX Calculation Tool vs CTCAE 6 Pro

The clearest difference is in-app purchases: RBCX Calculation Tool at none against CTCAE 6 Pro's 2. CTCAE 6 Pro's advantage is update cadence (monthly vs every 15 months) and rating (5.0 vs 4.8). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. CTCAE 6 Pro sells 2 in-app purchases, starting at $1.99 per month. RBCX Calculation Tool asks for nothing beyond the download.

CTCAE 6 Pro holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 5 and 8 respectively.

RBCX Calculation Tool ships an update every 15 months, CTCAE 6 Pro monthly. Both last shipped on October 11, 2026.

## The numbers

| Metric | RBCX Calculation Tool | CTCAE 6 Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (5 ratings)](https://appshunter.io/ios/app/rbcx-calculation-tool/id1457982121/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/ctcae-6-pro/id1625560237/reviews)** |
| Number of ratings | 5 | **8** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Monthly** |
| Monetization | **Free** | Freemium |
| Size | 26 MB | 87 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Terumo BCT](https://appshunter.io/developer/1023483386) | [Koichiro Watanabe](https://appshunter.io/developer/1077985400) |

## What reviewers say

### RBCX Calculation Tool

[App page](https://appshunter.io/ios/app/rbcx-calculation-tool/id1457982121)

This medical tool assists healthcare professionals in estimating the required replacement fluid volume for red blood cell exchange procedures on the Spectra Optia system. It calculates volumes based on patient and fluid data to achieve target Hct and FCR, and can suggest custom primes.

**Highlights:** Estimate replacement fluid volume, Calculate target Hct and FCR, Determine custom prime recommendation, Uses patient and fluid data, Supports Spectra Optia system

**Features:** macOS Compatibility

**In-app purchases:** none


### CTCAE 6 Pro

[App page](https://appshunter.io/ios/app/ctcae-6-pro/id1625560237)

Easily review and annotate medical toxicity criteria. Bookmark adverse events, search keywords, and organize entries chronologically. Offers local data storage and optional premium features for advanced note-taking and data export.

**Highlights:** Quick CTCAE 6.0 content access, Unlimited adverse event bookmarking, Keyword search with highlighting, Local data storage, Version comparison (5.0 ⇄ 6.0), Smart notes and timeline management, Spreadsheet to custom list app conversion

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan – Monthly | $1.99 | per month |
| Premium Plan – Annual | $9.99 | per year |


## Frequently asked questions

### Is RBCX Calculation Tool free?

RBCX Calculation Tool is free to download, with no in-app purchases.

### Is CTCAE 6 Pro free?

CTCAE 6 Pro is free to download, with in-app purchases available.

### Which has better reviews, RBCX Calculation Tool or CTCAE 6 Pro?

CTCAE 6 Pro is rated higher. RBCX Calculation Tool averages 4.8 out of 5 from 5 ratings, while CTCAE 6 Pro averages 5.0 from 8 ratings.

### Do RBCX Calculation Tool or CTCAE 6 Pro have ads?

Neither RBCX Calculation Tool nor CTCAE 6 Pro shows ads.

### Which is updated more often, RBCX Calculation Tool or CTCAE 6 Pro?

RBCX Calculation Tool ships an update every 15 months, and CTCAE 6 Pro monthly. Most recently, RBCX Calculation Tool was updated on October 11, 2026 and CTCAE 6 Pro on October 11, 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.*