# ACLS Fast vs arrhythmia

The clearest difference is price: arrhythmia at Free against ACLS Fast's $3.99. arrhythmia also leads on rating (4.2 vs 2.8) and update cadence (every 3 weeks vs every 3 months). ACLS Fast's advantage is in-app purchases (none vs 3) and review sentiment (76% vs 45%). On ads and device support there is nothing between them.

arrhythmia is free to download; ACLS Fast costs $3.99 up front. arrhythmia sells 3 in-app purchases, starting at $2.99 per month. ACLS Fast asks for nothing beyond the download.

arrhythmia holds the better App Store score, 4.2 against 2.8. That said, the two scores are not equally well evidenced: arrhythmia has 111 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 76% of ACLS Fast's written reviews are positive against 45% of arrhythmia's, so the app with the better star average is not the one people write more warmly about.

ACLS Fast ships an update every 3 months, arrhythmia every 3 weeks. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | ACLS Fast | arrhythmia |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [2.8 (4 ratings)](https://appshunter.io/ios/app/acls-fast/id654570275/reviews) | **[4.2 (111 ratings)](https://appshunter.io/ios/app/arrhythmia/id996560473/reviews)** |
| Number of ratings | 4 | **111** |
| Positive reviews | **75.8% of reviews** | 45.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free** | Subscription |
| Best chart rank | — | **#188** |
| Size | 20 MB | 159 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | +17 | 17+ |
| Developer | [Crystal Clear Solutions](https://appshunter.io/developer/444062170) | [Single Sail Software, LLC](https://appshunter.io/developer/359715495) |

## What reviewers say

### ACLS Fast

[App page](https://appshunter.io/ios/app/acls-fast/id654570275)

This app provides rapid guidance for ACLS 2020 guidelines, helping users quickly determine appropriate therapies through a question-based system. It includes information on rhythms, arrhythmias, acute coronary and stroke syndromes, and features a two-minute timer for code management.

**Highlights:** Question-based therapy guidance, Rhythms and arrhythmias management, Acute coronary and stroke syndrome protocols, Two-minute code timer with alarm, Interactive multiple-choice exams, Rapid diagnosis and treatment support

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is ACLS Fast free?

ACLS Fast costs $3.99, with no in-app purchases.

### Is arrhythmia free?

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

### Which has better reviews, ACLS Fast or arrhythmia?

arrhythmia is rated higher. ACLS Fast averages 2.8 out of 5 from 4 ratings, while arrhythmia averages 4.2 from 111 ratings.

### Do ACLS Fast or arrhythmia have ads?

Neither ACLS Fast nor arrhythmia shows ads.

### Which is updated more often, ACLS Fast or arrhythmia?

ACLS Fast ships an update every 3 months, and arrhythmia every 3 weeks. Most recently, ACLS Fast was updated on September 24, 2026 and arrhythmia on September 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.*