# ABG Expert vs VentilO

The clearest difference is rating: VentilO at 5.0 against ABG Expert's 4.8. VentilO also leads on update cadence (every 2 months vs every 5 months). ABG Expert's advantage is ratings volume (9 vs 2). 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.

VentilO holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 9 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

ABG Expert ships an update every 5 months, VentilO every 2 months. The most recent releases landed on June 9, 2026 and June 15, 2026 respectively.

## The numbers

| Metric | ABG Expert | VentilO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (9 ratings)](https://appshunter.io/ios/app/abg-expert/id885575488/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ventilo/id1478758927/reviews)** |
| Number of ratings | **9** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 2 MB | 26 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Brian Dale Vander Werf MD Inc](https://appshunter.io/developer/1521935908) | [Institut universitaire de cardiologie et de pneumologie de Quebec](https://appshunter.io/developer/576953454) |

## 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


### VentilO

[App page](https://appshunter.io/ios/app/ventilo/id1478758927)

This educational app helps healthcare professionals manage patients on mechanical ventilation. It provides guidance on setting initial parameters, optimizing settings for oxygenation and CO2 elimination, and understanding the impact of dead space. It also includes tools for calculating various respiratory parameters and links to additional resources.

**Highlights:** Initial ventilatory setting guidance, Parameter influence analysis, Optimization for oxygenation and CO2, Dead space impact education, Instrumental dead space calculation, Respiratory calculators, Links to additional tools

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ABG Expert free?

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

### Is VentilO free?

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

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

VentilO is rated higher. ABG Expert averages 4.8 out of 5 from 9 ratings, while VentilO averages 5.0 from 2 ratings.

### Do ABG Expert or VentilO have ads?

Neither ABG Expert nor VentilO shows ads.

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

ABG Expert ships an update every 5 months, and VentilO every 2 months. Most recently, ABG Expert was updated on June 9, 2026 and VentilO on June 15, 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.*