Comparison

iArrest vs On

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

iArrest

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
Read full description

iArrest was developed to give healthcare professionals a powerful tool to navigate stressful and challenging cardiac arrest calls. Whether as a Paramedic on scene or as a clinician in hospital, this app can assist in running structured and effective adult cardiac arrest scenarios. Developed by clinicians working in large inner city teaching hospitals, this app takes into consideration the most recent Resuscitation Council (UK) Guidelines 2021. It serves as an aide-memoire for basic tasks that can easily be overlooked in stressful scenarios. iArrest also incorporates a number of timers to assist with rhythm analysis, adrenaline timings and arrest documentation. It will remind the user via audible and visual cues about necessary interventions even if a clinician’s phone is muted. iArrest has been programmed to prevent phones from going into sleep mode, in order to ensure continuous use throughout the arrest. iArrest will record the exact time an important event or an intervention has occurred and present the user with a detailed log of events. These logs can be copied to the clipboard and used for documentation and record keeping. iArrest is currently undergoing extensive testing in simulated and real world scenarios. We are continuously improving and expanding on iArrest’s functionality. Disclaimer: iArrest can not replace sound knowledge in Advance Life Support and should not be used by non-ALS trained clinicians. Use this app at your own risk and always use appropriate clinical judgement. Please familiarise yourself with the functionality of this app before using it in real life scenarios. The creators of this app shall not be liable for any claims or losses arising from the use or misuse of this app, its contents, any omissions from its contents, or otherwise. By using this app you agree to these terms and conditions.

About

On

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
Read full description

On-call is the job management app built specifically for doctors working on-call shifts. It gives you a clean, fast way to track jobs, prioritise your workload and hand over safely. Track jobs the way you actually work. Add urgent and routine jobs as the bleeps come in. Handover in seconds. Generate a clean, structured summary in one tap. Send via messages, qr code or airdrop. Your data stays on your device, On-call stores everything locally. No accounts, no cloud sync, no analytics, no tracking. Data never leaves your phone. Face ID protection keeps the app locked between uses. Designed by a doctor, for doctors. Every design decision was made with a busy on-call shift in mind. Fast to open, fast to add a job, fast to clear one when it's done. On-call is completely free.

Screenshots

iArrest4 screens
On4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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

Scorecard3 real differences · 7 level
iArrest versus On: the parameters behind the verdict, then further details
ParameteriArrestOn
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews94.1% of reviews100.0% of reviews — better
Number of ratings3 — better—
Update frequencyEvery 13 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS12.0 — better17.6
Further details — not scored
Size31 MB8 MB
Age rating12+4+
DeveloperMaximilian NeunMohsin Asad Sadiq

Customer experience

iArrest

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews17 reviews
Positive94.1%
Neutral0.0%
Negative5.9%

On

Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

iArrest

No in-app purchases

1 purchases

On

One-time1
  • Buy me a coffee$2.99

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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