# ABG Expert vs ABG Book

The clearest difference is update cadence: ABG Book at every 5 days against ABG Expert's every 5 months. ABG Book also leads on rating (5.0 vs 4.8) and iOS requirement (9.0 vs 13.0). ABG Expert's advantage is ratings volume (9 vs 1). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ABG Book holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: ABG Expert has 9 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

ABG Expert ships an update every 5 months, ABG Book every 5 days. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ABG Expert | ABG Book |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (9 ratings)](https://appshunter.io/ios/app/abg-expert/id885575488/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/abg-book/id1236527641/reviews)** |
| Number of ratings | **9** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 2 MB | 41 MB |
| Requires iOS | 13.0 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Brian Dale Vander Werf MD Inc](https://appshunter.io/developer/1521935908) | [Satish Deopujari](https://appshunter.io/developer/1180072702) |

## What reviewers say

### ABG Expert

[App page](https://appshunter.io/ios/app/abg-expert/id885575488)

This medical tool provides accurate and flexible acid-base analysis for healthcare professionals. It offers detailed explanations, customizable ranges, and advanced features like anion gap correction and A-a gradient adjustments for various patient conditions and locations.

**Highlights:** Validated accuracy with real-world testing, Plausibility checks for physiologically impossible data, Automatic anion gap correction with albumin, Detailed explanations with equations, Separate or combined analysis of ABG, anion gap, A-a gradient, Customizable normal ranges for anion gap and delta gap, Age and barometric pressure adjustments for A-a gradient, Support for SI and non-SI units, Color-coded results and differential diagnoses, Adjustments for chronic respiratory conditions

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is ABG Expert free?

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

### Is ABG Book free?

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

### Which has better reviews, ABG Expert or ABG Book?

ABG Book is rated higher. ABG Expert averages 4.8 out of 5 from 9 ratings, while ABG Book averages 5.0 from 1 ratings.

### Do ABG Expert or ABG Book have ads?

Neither ABG Expert nor ABG Book shows ads.

### Which is updated more often, ABG Expert or ABG Book?

ABG Expert ships an update every 5 months, and ABG Book every 5 days. Most recently, ABG Expert was updated on October 20, 2026 and ABG Book on October 24, 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.*