# RBCX Calculation Tool vs SBTMO

The clearest difference is update cadence: SBTMO at every 3 months against RBCX Calculation Tool's every 15 months. On price, ads, in-app purchases and device support there is nothing between them.

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

RBCX Calculation Tool ships an update every 15 months, SBTMO every 3 months. The most recent releases landed on September 25, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | RBCX Calculation Tool | SBTMO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/rbcx-calculation-tool/id1457982121/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 26 MB | 66 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Terumo BCT](https://appshunter.io/developer/1023483386) | [Itarget Tecnologia](https://appshunter.io/developer/916261242) |

## 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


### SBTMO

[App page](https://appshunter.io/ios/app/sbtmo/id6748769903)

**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 SBTMO free?

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

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

Neither RBCX Calculation Tool nor SBTMO shows ads.

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

RBCX Calculation Tool ships an update every 15 months, and SBTMO every 3 months. Most recently, RBCX Calculation Tool was updated on September 25, 2026 and SBTMO on October 5, 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.*