# ABG Acid vs ABG Expert

The clearest difference is monetization model: ABG Expert at free against ABG Acid's paid. ABG Expert also leads on review sentiment (100% vs 63%). On price, rating, ratings volume and update cadence there is nothing between them.

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

ABG Expert holds the better App Store score, 4.8 against 4.6. Both are backed by a comparable volume of ratings — 7 and 9 respectively. Written reviews point the same way: 63% of ABG Acid's written reviews are positive against 100% of ABG Expert's.

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on October 16, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | ABG Acid | ABG Expert |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (7 ratings)](https://appshunter.io/ios/app/abg-acid-base-eval/id426019807/reviews) | **[4.8 (9 ratings)](https://appshunter.io/ios/app/abg-expert/id885575488/reviews)** |
| Number of ratings | 7 | **9** |
| Positive reviews | 63.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | Paid | **Free** |
| Size | 1 MB | 2 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Joshua D. steinberg](https://appshunter.io/developer/374154837) | [Brian Dale Vander Werf MD Inc](https://appshunter.io/developer/1521935908) |

## What reviewers say

### ABG Acid

[App page](https://appshunter.io/ios/app/abg-acid-base-eval/id426019807)

This app guides clinicians through analyzing ABGs and electrolytes to identify acid-base disorders and diagnostic ideas for ill patients. It teaches a stepwise thinking process and provides differential diagnoses with explanations, aiding patient care and clinician learning.

**Highlights:** Stepwise ABG and electrolyte analysis, Identifies acid-base disorders, Provides diagnostic ideas, Teaches critical thinking process, Includes differential diagnoses mnemonics, Calculates predicted pCO2 and corrected bicarbonate

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is ABG Acid free?

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

### Is ABG Expert free?

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

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

ABG Expert is rated higher. ABG Acid averages 4.6 out of 5 from 7 ratings, while ABG Expert averages 4.8 from 9 ratings.

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

Neither ABG Acid nor ABG Expert shows ads.

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

ABG Acid ships an update every 5 months, and ABG Expert every 5 months. Most recently, ABG Acid was updated on October 16, 2026 and ABG Expert on October 20, 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.*