# BM Counter vs RBCX Calculation Tool

The clearest difference is rating: RBCX Calculation Tool at 4.8 against BM Counter's 4.1. RBCX Calculation Tool also leads on ads (none vs shown) and update cadence (every 15 months vs every 72 months). BM Counter's advantage is iOS requirement (12.0 vs 15.6). On price, ratings volume, 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 holds the better App Store score, 4.8 against 4.1. Both are backed by a comparable volume of ratings — 9 and 5 respectively.

BM Counter ships an update every 72 months, RBCX Calculation Tool every 15 months. The most recent releases landed on September 18, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | BM Counter | RBCX Calculation Tool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (9 ratings)](https://appshunter.io/ios/app/bm-counter/id1360631254/reviews) | **[4.8 (5 ratings)](https://appshunter.io/ios/app/rbcx-calculation-tool/id1457982121/reviews)** |
| Number of ratings | **9** | 5 |
| Positive reviews | 86.4% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 72 months | **Every 15 months** |
| Monetization | Ad-supported | **Free** |
| Size | 54 MB | 26 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kazuyoshi Sasaoka](https://appshunter.io/developer/1348313140) | [Terumo BCT](https://appshunter.io/developer/1023483386) |

## What reviewers say

### BM Counter

[App page](https://appshunter.io/ios/app/bm-counter/id1360631254)

This app assists in counting bone marrow cells for clinical work in animal hospitals. It features touch-based counting with undo functionality and data archiving. Users can choose between vibration and sound notifications for a tactile counting experience.

**Highlights:** Touch cell button for counting, Count up & count down modes, Notifications at 100, 200, 500, 1000 counts, Undo last 3 counts, Archive count data, Vibration and/or sound feedback

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is BM Counter free?

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

### Is RBCX Calculation Tool free?

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

### Which has better reviews, BM Counter or RBCX Calculation Tool?

RBCX Calculation Tool is rated higher. BM Counter averages 4.1 out of 5 from 9 ratings, while RBCX Calculation Tool averages 4.8 from 5 ratings.

### Do BM Counter or RBCX Calculation Tool have ads?

BM Counter shows ads; RBCX Calculation Tool does not.

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

BM Counter ships an update every 72 months, and RBCX Calculation Tool every 15 months. Most recently, BM Counter was updated on September 18, 2026 and RBCX Calculation Tool on June 1, 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.*