# RBCX Calculation Tool vs HemeOncBuddy

The clearest difference is rating: HemeOncBuddy at 5.0 against RBCX Calculation Tool's 4.8. HemeOncBuddy also leads on ratings volume (17 vs 5). On price, update cadence, ads and in-app purchases there is nothing between them.

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

HemeOncBuddy holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 5 and 17 respectively.

RBCX Calculation Tool ships an update every 15 months, HemeOncBuddy every 24 months. The most recent releases landed on October 11, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | RBCX Calculation Tool | HemeOncBuddy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (5 ratings)](https://appshunter.io/ios/app/rbcx-calculation-tool/id1457982121/reviews) | **[5.0 (17 ratings)](https://appshunter.io/ios/app/hemeoncbuddy/id1579207336/reviews)** |
| Number of ratings | 5 | **17** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 15 months** | Every 24 months |
| Monetization | Free | Free |
| Size | 26 MB | 16 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Terumo BCT](https://appshunter.io/developer/1023483386) | [Veli Bakalov](https://appshunter.io/developer/1579207338) |

## 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


### HemeOncBuddy

[App page](https://appshunter.io/ios/app/hemeoncbuddy/id1579207336)

This app provides quick access to practice-changing clinical trials in Hematology and Oncology. It offers simplified summaries of trial background, inclusion/exclusion criteria, primary endpoints, and outcomes for easy reference.

**Highlights:** Practice-changing clinical trial summaries, Hematology and Oncology focus, Simplified trial information, Inclusion and exclusion criteria, Primary endpoints and outcomes, Quick reference tool

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

**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 HemeOncBuddy free?

HemeOncBuddy is free to download, with no in-app purchases.

### Which has better reviews, RBCX Calculation Tool or HemeOncBuddy?

HemeOncBuddy is rated higher. RBCX Calculation Tool averages 4.8 out of 5 from 5 ratings, while HemeOncBuddy averages 5.0 from 17 ratings.

### Do RBCX Calculation Tool or HemeOncBuddy have ads?

Neither RBCX Calculation Tool nor HemeOncBuddy shows ads.

### Which is updated more often, RBCX Calculation Tool or HemeOncBuddy?

RBCX Calculation Tool ships an update every 15 months, and HemeOncBuddy every 24 months. Most recently, RBCX Calculation Tool was updated on October 11, 2026 and HemeOncBuddy on October 2, 2026.

---

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