# arrhythmia vs R2EMSprotocols

The clearest difference is in-app purchases: R2EMSprotocols at none against arrhythmia's 3. R2EMSprotocols also leads on iOS requirement (15.0 vs 17.6). arrhythmia's advantage is update cadence (every 3 weeks vs every 17 months). On price, ads and device support there is nothing between them.

Both are free to download. arrhythmia sells 3 in-app purchases, starting at $2.99 per month. R2EMSprotocols asks for nothing beyond the download.

arrhythmia ships an update every 3 weeks, R2EMSprotocols every 17 months. The most recent releases landed on October 13, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | arrhythmia | R2EMSprotocols |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (111 ratings)](https://appshunter.io/ios/app/arrhythmia/id996560473/reviews)** | — |
| Number of ratings | **111** | — |
| Positive reviews | 43.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 17 months |
| Monetization | Subscription | — |
| Size | 159 MB | 27 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Single Sail Software, LLC](https://appshunter.io/developer/359715495) | [Acid Remap LLC](https://appshunter.io/developer/323130617) |

## What reviewers say

### arrhythmia

[App page](https://appshunter.io/ios/app/arrhythmia/id996560473)

Practice interpreting EKGs in lead II with realistic simulations. Choose rhythms to study or test your knowledge in a game mode. Ideal for healthcare professionals to hone their diagnostic skills.

**Highlights:** EKG interpretation practice, Lead II simulation, Study Mode with rhythm selection, Game Mode for random rhythm identification, Customizable rhythm sets, Realistic rhythm variations

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Yearly | $19.99 | per year |
| Unlock All Rhythms (One-time Purchase) | $4.99 | one-time |


### R2EMSprotocols

[App page](https://appshunter.io/ios/app/r2emsprotocols/id6447910608)

**In-app purchases:** none


## Frequently asked questions

### Is arrhythmia free?

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

### Is R2EMSprotocols free?

R2EMSprotocols is free to download, with no in-app purchases.

### Do arrhythmia or R2EMSprotocols have ads?

Neither arrhythmia nor R2EMSprotocols shows ads.

### Which is updated more often, arrhythmia or R2EMSprotocols?

arrhythmia ships an update every 3 weeks, and R2EMSprotocols every 17 months. Most recently, arrhythmia was updated on October 13, 2026 and R2EMSprotocols on September 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*