# ABG Expert vs VentRef

The clearest difference is update cadence: VentRef at every 3 weeks against ABG Expert's every 5 months. VentRef also leads on rating (5.0 vs 4.8) and ratings volume (44 vs 9). ABG Expert's advantage is iOS requirement (13.0 vs 26.0). 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.

VentRef holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 9 and 44 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

ABG Expert ships an update every 5 months, VentRef every 3 weeks. The most recent releases landed on October 20, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | ABG Expert | VentRef |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (9 ratings)](https://appshunter.io/ios/app/abg-expert/id885575488/reviews) | **[5.0 (44 ratings)](https://appshunter.io/ios/app/ventref/id6756503414/reviews)** |
| Number of ratings | 9 | **44** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 2 MB | 27 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Brian Dale Vander Werf MD Inc](https://appshunter.io/developer/1521935908) | [Rishi Kumar](https://appshunter.io/developer/1434016052) |

## 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


### VentRef

[App page](https://appshunter.io/ios/app/ventref/id6756503414)

A clinical reference tool for healthcare professionals managing mechanical ventilation and oxygen therapy. It provides information grounded in respiratory physiology and evidence-based critical care.

**Highlights:** Mechanical ventilation reference, Oxygen therapy reference, Respiratory physiology, Evidence-based critical care, Clinical decision support

**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 VentRef free?

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

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

VentRef is rated higher. ABG Expert averages 4.8 out of 5 from 9 ratings, while VentRef averages 5.0 from 44 ratings.

### Do ABG Expert or VentRef have ads?

Neither ABG Expert nor VentRef shows ads.

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

ABG Expert ships an update every 5 months, and VentRef every 3 weeks. Most recently, ABG Expert was updated on October 20, 2026 and VentRef on October 28, 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.*