# ABG Expert vs Critical ABG

The clearest difference is review sentiment: ABG Expert at 100% against Critical ABG's 50%. ABG Expert also leads on price (Free vs $3.99) and rating (4.8 vs 4.0). On ratings volume, ads, in-app purchases and device support there is nothing between them.

ABG Expert is free to download; Critical ABG costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ABG Expert holds the better App Store score, 4.8 against 4.0. Both are backed by a comparable volume of ratings — 9 and 4 respectively. Written reviews point the same way: 100% of ABG Expert's written reviews are positive against 50% of Critical ABG's.

ABG Expert ships an update every 5 months, Critical ABG every 42 months. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ABG Expert | Critical ABG |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.8 (9 ratings)](https://appshunter.io/ios/app/abg-expert/id885575488/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/critical-abg/id1438674467/reviews) |
| Number of ratings | **9** | 4 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 42 months |
| Monetization | **Free** | Paid |
| Size | 2 MB | 3 MB |
| Requires iOS | **13.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | +17 |
| Developer | [Brian Dale Vander Werf MD Inc](https://appshunter.io/developer/1521935908) | [The Barringer Group, LLC](https://appshunter.io/developer/504065735) |

## 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


### Critical ABG

[App page](https://appshunter.io/ios/app/critical-abg/id1438674467)

This medical app provides a comprehensive analysis of acid-base disorders with a step-by-step approach to understanding them. It includes common causes, differential treatment options, and built-in compensation mechanisms. An optimization calculator for ventilator settings is also available.

**Highlights:** Acid-base disorder analysis, Step-by-step understanding, Common causes and treatments, Compensation mechanisms, Ventilation optimization calculator, Differential diagnosis

**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 Critical ABG free?

Critical ABG costs $3.99, with no in-app purchases.

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

ABG Expert is rated higher. ABG Expert averages 4.8 out of 5 from 9 ratings, while Critical ABG averages 4.0 from 4 ratings.

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

Neither ABG Expert nor Critical ABG shows ads.

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

ABG Expert ships an update every 5 months, and Critical ABG every 42 months. Most recently, ABG Expert was updated on November 1, 2026 and Critical ABG on November 5, 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.*