# RBCX Calculation Tool vs CAP Member App

The clearest difference is update cadence: CAP Member App at every 3 months against RBCX Calculation Tool's every 15 months. CAP Member App also leads on rating (5.0 vs 4.8) and iOS requirement (13.0 vs 15.6). RBCX Calculation Tool's advantage is ratings volume (5 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

CAP Member App holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: RBCX Calculation Tool has 5 ratings behind it against 1, so its average is the more settled of the two.

RBCX Calculation Tool ships an update every 15 months, CAP Member App every 3 months. The most recent releases landed on June 1, 2026 and July 6, 2026 respectively.

## The numbers

| Metric | RBCX Calculation Tool | CAP Member App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (5 ratings)](https://appshunter.io/ios/app/rbcx-calculation-tool/id1457982121/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cap-member-app/id6744061777/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 26 MB | 37 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Terumo BCT](https://appshunter.io/developer/1023483386) | [College of American Pathologists](https://appshunter.io/developer/634258459) |

## 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


### CAP Member App

[App page](https://appshunter.io/ios/app/cap-member-app/id6744061777)

Connect with fellow pathologists and access essential resources to advance your career. Engage with experts, explore professional development materials, and advocate for patient care.

**Highlights:** Member directory access, Access to Cancer Protocols, Topic-driven interviews, Interactive cases, Resource articles, Legislator connection

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RBCX Calculation Tool free?

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

### Is CAP Member App free?

CAP Member App is free to download, with no in-app purchases.

### Which has better reviews, RBCX Calculation Tool or CAP Member App?

CAP Member App is rated higher. RBCX Calculation Tool averages 4.8 out of 5 from 5 ratings, while CAP Member App averages 5.0 from 1 ratings.

### Do RBCX Calculation Tool or CAP Member App have ads?

Neither RBCX Calculation Tool nor CAP Member App shows ads.

### Which is updated more often, RBCX Calculation Tool or CAP Member App?

RBCX Calculation Tool ships an update every 15 months, and CAP Member App every 3 months. Most recently, RBCX Calculation Tool was updated on June 1, 2026 and CAP Member App on July 6, 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.*