# arrhythmia vs ECG Notes

The clearest difference is monetization model: ECG Notes at free with in-app purchases against arrhythmia's subscription. ECG Notes also leads on rating (4.7 vs 4.2) and iOS requirement (13.0 vs 17.6). arrhythmia's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 3 months). On price, review sentiment, in-app purchases 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 and ECG Notes sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ECG Notes holds the better App Store score, 4.7 against 4.2. That said, the two scores are not equally well evidenced: arrhythmia has 111 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 45% of arrhythmia's written reviews are positive against 50% of ECG Notes's.

arrhythmia ships an update every 3 weeks, ECG Notes every 3 months. The most recent releases landed on September 29, 2026 and August 12, 2026 respectively.

## The numbers

| Metric | arrhythmia | ECG Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (111 ratings)](https://appshunter.io/ios/app/arrhythmia/id996560473/reviews) | **[4.7 (12 ratings)](https://appshunter.io/ios/app/ecg-notes-quick-look-up-ref/id1146393355/reviews)** |
| Number of ratings | **111** | 12 |
| Positive reviews | 45.0% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Subscription | **Free with in-app purchases** |
| Best chart rank | **#168** | — |
| Size | 159 MB | 46 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Single Sail Software, LLC](https://appshunter.io/developer/359715495) | [Skyscape Medpresso Inc](https://appshunter.io/developer/818609416) |

## What reviewers say

### arrhythmia

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

**Currently charting:** #168 Top Grossing · Medical (US App Store)

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 |


### ECG Notes

[App page](https://appshunter.io/ios/app/ecg-notes-quick-look-up-ref/id1146393355)

This pocket guide offers a quick reference for ECG interpretation and management, covering basics, 12-lead ECGs, ACLS, CPR, and emergency medications. It includes over 100 ECG strips and practice questions, with content updated to the latest guidelines. No internet connection is needed after initial download.

**Highlights:** 125 ECG rhythm strips, Comprehensive coverage: basics, ECG, ACLS, PALS, meds, CPR, CPR algorithms in tabular format, Test Yourself ECG strips with real-life arrhythmias, Clinical Tips and PALS coverage, SmartSearch technology for quick look-up, Offline content access

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ECG Notes-Ed.4 | $34.99 | one-time |


## Frequently asked questions

### Is arrhythmia free?

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

### Is ECG Notes free?

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

### Which has better reviews, arrhythmia or ECG Notes?

ECG Notes is rated higher. arrhythmia averages 4.2 out of 5 from 111 ratings, while ECG Notes averages 4.7 from 12 ratings.

### Do arrhythmia or ECG Notes have ads?

ECG Notes shows ads; arrhythmia does not.

### Which is updated more often, arrhythmia or ECG Notes?

arrhythmia ships an update every 3 weeks, and ECG Notes every 3 months. Most recently, arrhythmia was updated on September 29, 2026 and ECG Notes on August 12, 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.*