# Blood Components vs iArrest

The clearest difference is iOS requirement: iArrest at 12.0 against Blood Components's 15.1. On price, review sentiment, update cadence and ads there is nothing between them.

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

Blood Components ships an update every 19 months, iArrest every 13 months. Both last shipped on September 21, 2026.

## The numbers

| Metric | Blood Components | iArrest |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/iarrest/id1280974002/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | **100.0% of reviews** | 94.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 13 months** |
| Monetization | Free | Free |
| Size | 16 MB | 31 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [NHS](https://appshunter.io/developer/1192687136) | [Maximilian Neun](https://appshunter.io/developer/1280974001) |

## What reviewers say

### Blood Components

[App page](https://appshunter.io/ios/app/blood-components/id1221434626)

This app provides clinicians with a summary of national guidelines for the appropriate use of blood components. It facilitates robust documentation of transfusion indications, referencing key medical guidelines.

**Highlights:** Summarizes national blood transfusion guidelines, Facilitates appropriate blood use, Enables documentation of transfusion indications, References NBTC, BSH, and NICE guidelines, Acts as a clinical reference tool

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

**In-app purchases:** none


### iArrest

[App page](https://appshunter.io/ios/app/iarrest/id1280974002)

This app assists healthcare professionals during cardiac arrest calls by providing structured guidance based on the latest resuscitation guidelines. It includes timers for critical interventions and generates detailed event logs for documentation. Designed for paramedics and hospital clinicians, it acts as a reminder for essential tasks in high-pressure situations.

**Highlights:** Structured cardiac arrest guidance, Adult resuscitation scenarios, Based on UK Resuscitation Council Guidelines 2021, Timers for rhythm analysis and adrenaline, Audible and visual intervention reminders, Continuous use prevention of sleep mode, Detailed event logging

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

**In-app purchases:** none


## Frequently asked questions

### Is Blood Components free?

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

### Is iArrest free?

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

### Do Blood Components or iArrest have ads?

Neither Blood Components nor iArrest shows ads.

### Which is updated more often, Blood Components or iArrest?

Blood Components ships an update every 19 months, and iArrest every 13 months. Most recently, Blood Components was updated on September 21, 2026 and iArrest on September 21, 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.*