# arrhythmia vs NK Dimensions AR

The clearest difference is rating: NK Dimensions AR at 5.0 against arrhythmia's 4.1. NK Dimensions AR also leads on in-app purchases (none vs 3) and update cadence (weekly vs every 3 weeks). arrhythmia's advantage is ratings volume (113 vs 3) and chart position (#198 vs unranked). 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. NK Dimensions AR asks for nothing beyond the download.

NK Dimensions AR 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 3, so its average is the more settled of the two.

arrhythmia ships an update every 3 weeks, NK Dimensions AR weekly. The most recent releases landed on October 26, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | arrhythmia | NK Dimensions AR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (113 ratings)](https://appshunter.io/ios/app/arrhythmia/id996560473/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/nk-dimensions-ar/id1463051986/reviews)** |
| Number of ratings | **113** | 3 |
| Positive reviews | 43.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Subscription | **Free** |
| Best chart rank | **#198** | — |
| Size | 159 MB | 212 MB |
| Requires iOS | 17.6 | **9.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Single Sail Software, LLC](https://appshunter.io/developer/359715495) | [Nihon Kohden America, Inc.](https://appshunter.io/developer/1146663859) |

## What reviewers say

### arrhythmia

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

**Currently charting:** #198 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 |

**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


### NK Dimensions AR

[App page](https://appshunter.io/ios/app/nk-dimensions-ar/id1463051986)

Learn proper electrode placement for 3 and 6 lead sets. This app also educates clinicians on identifying and understanding common cardiac arrhythmias. Requires physical posters to use.

**Highlights:** Electrode placement learning, 3 and 6 lead set guidance, Cardiac arrhythmia identification, Clinical education tool, Augmented reality visualization

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is arrhythmia free?

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

### Is NK Dimensions AR free?

NK Dimensions AR is free to download, with no in-app purchases.

### Which has better reviews, arrhythmia or NK Dimensions AR?

NK Dimensions AR is rated higher. arrhythmia averages 4.1 out of 5 from 113 ratings, while NK Dimensions AR averages 5.0 from 3 ratings.

### Do arrhythmia or NK Dimensions AR have ads?

Neither arrhythmia nor NK Dimensions AR shows ads.

### Which is updated more often, arrhythmia or NK Dimensions AR?

arrhythmia ships an update every 3 weeks, and NK Dimensions AR weekly. Most recently, arrhythmia was updated on October 26, 2026 and NK Dimensions AR 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.*