# arrhythmia vs ABGs NOW!

The clearest difference is price: arrhythmia at Free against ABGs NOW!'s $0.99. arrhythmia also leads on ratings volume (111 vs 2) and update cadence (every 3 weeks vs every 2 months). ABGs NOW!'s advantage is rating (5.0 vs 4.2) and in-app purchases (none vs 3). On ads, chart position and device support there is nothing between them.

arrhythmia is free to download; ABGs NOW! costs $0.99 up front. arrhythmia sells 3 in-app purchases, starting at $2.99 per month. ABGs NOW! asks for nothing beyond the download.

ABGs NOW! holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: arrhythmia has 111 ratings behind it against 2, so its average is the more settled of the two.

arrhythmia ships an update every 3 weeks, ABGs NOW! every 2 months. The most recent releases landed on September 21, 2026 and September 5, 2026 respectively.

## The numbers

| Metric | arrhythmia | ABGs NOW! |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.2 (111 ratings)](https://appshunter.io/ios/app/arrhythmia/id996560473/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/abgs-now/id1496483403/reviews)** |
| Number of ratings | **111** | 2 |
| Positive reviews | 45.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Subscription | **Paid** |
| Best chart rank | **#188** | #194 |
| Size | 159 MB | 161 MB |
| Requires iOS | 17.6 | **10.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Single Sail Software, LLC](https://appshunter.io/developer/359715495) | [Bytewise Studios, LLC](https://appshunter.io/developer/1496483402) |

## What reviewers say

### arrhythmia

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

**Currently charting:** #188 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 |


### ABGs NOW!

[App page](https://appshunter.io/ios/app/abgs-now/id1496483403)

**Currently charting:** #194 Top Paid · Medical (US App Store)

Master arterial blood gas interpretation with this interactive tool. It offers a calculator for quick answers, practice sessions with hints, and a challenge mode to test your skills. Detailed analysis is provided for any errors, making learning engaging.

**Highlights:** ABG Calculator, Practice Mode with Hints, Challenge Mode, Detailed Analysis, Knowledge Strengthening

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is arrhythmia free?

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

### Is ABGs NOW! free?

ABGs NOW! costs $0.99, with no in-app purchases.

### Which has better reviews, arrhythmia or ABGs NOW!?

ABGs NOW! is rated higher. arrhythmia averages 4.2 out of 5 from 111 ratings, while ABGs NOW! averages 5.0 from 2 ratings.

### Do arrhythmia or ABGs NOW! have ads?

Neither arrhythmia nor ABGs NOW! shows ads.

### Which is updated more often, arrhythmia or ABGs NOW!?

arrhythmia ships an update every 3 weeks, and ABGs NOW! every 2 months. Most recently, arrhythmia was updated on September 21, 2026 and ABGs NOW! on September 5, 2026.

### Which is more popular, arrhythmia or ABGs NOW!?

arrhythmia currently peaks at #188 in the App Store charts, and ABGs NOW! at #194. Chart position reflects recent download velocity rather than total install base.

---

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