# iArrest vs On

The clearest difference is in-app purchases: iArrest at none against On's 1. iArrest also leads on iOS requirement (12.0 vs 17.6). On's advantage is update cadence (weekly vs every 13 months). On price, review sentiment, ads and monetization model there is nothing between them.

Both are free to download. On sells 1 one-off in-app purchase. iArrest asks for nothing beyond the download.

iArrest ships an update every 13 months, On weekly. Both last shipped on October 8, 2026.

## The numbers

| Metric | iArrest | On |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/iarrest/id1280974002/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 94.1% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Weekly** |
| Monetization | Free | Free |
| Size | 31 MB | 8 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Maximilian Neun](https://appshunter.io/developer/1280974001) | [Mohsin Asad Sadiq](https://appshunter.io/developer/1896638622) |

## What reviewers say

### 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


### On

[App page](https://appshunter.io/ios/app/on-call/id6769200317)

Manage on-call shifts and track medical jobs efficiently. Prioritize workload, generate handover summaries instantly, and ensure data privacy with local storage. Designed by a doctor for fast, secure use during busy shifts.

**Highlights:** Track urgent and routine jobs, Prioritize workload, Generate structured handover summaries, Secure local data storage, Face ID protection, Fast and intuitive interface

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a coffee | $2.99 | one-time |


## Frequently asked questions

### Is iArrest free?

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

### Is On free?

On is free to download, with in-app purchases available.

### Do iArrest or On have ads?

Neither iArrest nor On shows ads.

### Which is updated more often, iArrest or On?

iArrest ships an update every 13 months, and On weekly. Most recently, iArrest was updated on October 8, 2026 and On on October 8, 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.*