# ABG Book vs AHA ACLS

ABG Book and AHA ACLS both sit at 5.0 stars, but that hides the real split: 100% of ABG Book's written reviews are positive against 26% of AHA ACLS's. ABG Book also leads on in-app purchases (none vs 1) and update cadence (every 5 days vs every 2 months). AHA ACLS's advantage is ratings volume (370 vs 1) and chart position (#45 vs unranked). On price, rating, ads and device support there is nothing between them.

Both are free to download. AHA ACLS sells 1 in-app purchase, starting at $3.99 per year. ABG Book asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for ABG Book against 4.9 for AHA ACLS. That said, the two scores are not equally well evidenced: AHA ACLS has 370 ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 100% of ABG Book's written reviews are positive against 26% of AHA ACLS's.

ABG Book ships an update every 5 days, AHA ACLS every 2 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | ABG Book | AHA ACLS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/abg-book/id1236527641/reviews)** | [4.9 (370 ratings)](https://appshunter.io/ios/app/aha-acls/id1506944443/reviews) |
| Number of ratings | 1 | **370** |
| Positive reviews | **100.0% of reviews** | 26.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 months |
| Monetization | **Free** | Subscription |
| Best chart rank | — | **#45** |
| Size | 41 MB | 48 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Satish Deopujari](https://appshunter.io/developer/1180072702) | [Massachusetts General Hospital](https://appshunter.io/developer/376928206) |

## What reviewers say

### ABG Book

[App page](https://appshunter.io/ios/app/abg-book/id1236527641)

This interactive book simplifies the complex topic of ACID-BASE balance through dynamic learning. It integrates graphics and equations to provide in-depth understanding and can be used as a teaching tool.

**Highlights:** Interactive ACID-BASE balance learning, Dynamic pH and HH equation understanding, Integration of graphics with equations, In-depth ABG graphics knowledge, Futility of Bicarbonate in diagnosis, ABG tutor for presentations

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

**In-app purchases:** none


### AHA ACLS

[App page](https://appshunter.io/ios/app/aha-acls/id1506944443)

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

This app provides clinicians with a digital tool to assist in running cardiac arrest codes and delivering advanced cardiac life support (ACLS) at the bedside. It features the latest AHA recommendations and includes intuitive access to algorithms, drug dosing, and timers for efficient patient care.

**Highlights:** 4 ACLS algorithms (cardiac arrest, tachycardia, bradycardia, post-arrest), Latest 2025 AHA ACLS content, Drug therapy and dosing, Easy-to-read timers, CPR and epinephrine logging, Rapid transition to post-arrest care

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ACLS Pro | $3.99 | per year |

**What reviewers like**

- ✅ Accurate, up-to-date AHA ACLS algorithms
- ⏱️ Built-in timers and counters for code management
- 👍 User-friendly, intuitive interface
- 🏥 Trusted by Harvard/MGH and American Heart Association
- 📋 Helpful for documentation and PCR completion

**What reviewers complain about**

- 💰 Subscription paywall on previously free app
- 🚨 Dangerous surprise paywall during active codes
- ⚠️ No warning before transition to paid model
- 🔐 Requires payment even for basic ACLS information
- 😤 Perceived greed from wealthy organizations (MGH/AHA)

**Reported bugs**

- App fails to load information despite subscription payment
- Users locked out of app mid-code
- Unexpected app crashes during critical moments

**Requested features**

- Multiple log storage with dates
- More detailed code logging with event documentation (IO access, medications, rhythms)
- End code button and pause compressions feature
- Real-time log tracking for back-charting
- LVAD algorithm inclusion


## Frequently asked questions

### Is ABG Book free?

ABG Book is free to download, with no in-app purchases.

### Is AHA ACLS free?

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

### Which has better reviews, ABG Book or AHA ACLS?

ABG Book is rated higher. ABG Book averages 5.0 out of 5 from 1 ratings, while AHA ACLS averages 4.9 from 370 ratings.

### Do ABG Book or AHA ACLS have ads?

Neither ABG Book nor AHA ACLS shows ads.

### Which is updated more often, ABG Book or AHA ACLS?

ABG Book ships an update every 5 days, and AHA ACLS every 2 months. Most recently, ABG Book was updated on October 24, 2026 and AHA ACLS on October 27, 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.*