# ECG Challenge vs arrhythmia

The clearest difference is review sentiment: ECG Challenge at 100% against arrhythmia's 44%. ECG Challenge also leads on rating (5.0 vs 4.1) and in-app purchases (none vs 3). arrhythmia's advantage is price (Free vs $5.99) and update cadence (every 3 weeks vs every 11 months). On ads, device support and iOS requirement there is nothing between them.

arrhythmia is free to download; ECG Challenge costs $5.99 up front. arrhythmia sells 3 in-app purchases, starting at $2.99 per month. ECG Challenge asks for nothing beyond the download.

ECG Challenge holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: arrhythmia has 113 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of ECG Challenge's written reviews are positive against 44% of arrhythmia's.

ECG Challenge ships an update every 11 months, arrhythmia every 3 weeks. The most recent releases landed on October 22, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | ECG Challenge | arrhythmia |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ecg-challenge/id541319389/reviews)** | [4.1 (113 ratings)](https://appshunter.io/ios/app/arrhythmia/id996560473/reviews) |
| Number of ratings | 1 | **113** |
| Positive reviews | **100.0% of reviews** | 43.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 weeks** |
| Monetization | **Paid** | Subscription |
| Best chart rank | **#45** | — |
| Size | 51 MB | 159 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 17+ | 17+ |
| Developer | [Limmer Creative](https://appshunter.io/developer/387423724) | [Single Sail Software, LLC](https://appshunter.io/developer/359715495) |

## What reviewers say

### ECG Challenge

[App page](https://appshunter.io/ios/app/ecg-challenge/id541319389)

**Currently charting:** #45 Top Paid · Medical (US App Store)

This app offers over 150 real-world ECG strips for medical professionals and students to practice and improve their interpretation skills. It provides detailed rationales and personalized study options to build confidence and enhance patient care.

**Highlights:** 150+ real-world ECG strips, Detailed rationales, Personalized study options, Progress tracking, Clinically obtained ECGs

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

**In-app purchases:** none


### 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 |

**What reviewers like**

- 👍 Great study tool for EKGs
- 👍 Helpful for understanding EKGs
- 👍 Good for practicing rhythm recognition
- 👍 Interactive and colorful design
- 👍 Dynamic testing

**What reviewers complain about**

- 👎 Immediately asks for paid version
- 👎 Missing common and important rhythms
- 👎 Rhythms are unrealistic
- 👎 Cannot try before signing up
- 👎 Clunky and slow horizontal scrolling

**Reported bugs**

- App no longer works after iOS update
- App does not work on Apple Watch

**Requested features**

- Add more common and important rhythms (torsades, WPW, STEMI, accelerated/tachycardic idioventricular, WAP, MAT)
- Option to read as a 12-lead instead of a single rhythm line
- Add variations to rhythms
- Add Left Bundle Branch Block
- Add a 12-lead option


## Frequently asked questions

### Is ECG Challenge free?

ECG Challenge costs $5.99, with no in-app purchases.

### Is arrhythmia free?

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

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

ECG Challenge is rated higher. ECG Challenge averages 5.0 out of 5 from 1 ratings, while arrhythmia averages 4.1 from 113 ratings.

### Do ECG Challenge or arrhythmia have ads?

Neither ECG Challenge nor arrhythmia shows ads.

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

ECG Challenge ships an update every 11 months, and arrhythmia every 3 weeks. Most recently, ECG Challenge was updated on October 22, 2026 and arrhythmia on October 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.*