# ETCO2 Tutor vs VentRef

The clearest difference is update cadence: VentRef at every 3 weeks against ETCO2 Tutor's every 5 months. VentRef also leads on ratings volume (44 vs 2). ETCO2 Tutor's advantage is iOS requirement (7.0 vs 26.0). On price, rating, review sentiment and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for ETCO2 Tutor against 5.0 for VentRef. That said, the two scores are not equally well evidenced: VentRef has 44 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

ETCO2 Tutor ships an update every 5 months, VentRef every 3 weeks. The most recent releases landed on October 4, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | ETCO2 Tutor | VentRef |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/etco2-tutor/id1047646888/reviews) | [5.0 (44 ratings)](https://appshunter.io/ios/app/ventref/id6756503414/reviews) |
| Number of ratings | 2 | **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 | 33 MB | 27 MB |
| Requires iOS | **7.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Satish Deopujari](https://appshunter.io/developer/1180072702) | [Rishi Kumar](https://appshunter.io/developer/1434016052) |

## What reviewers say

### ETCO2 Tutor

[App page](https://appshunter.io/ios/app/etco2-tutor/id1047646888)

Learn about End-tidal CO2 (ETCO2) and its significance in monitoring patient respiration. This app visualizes ETCO2 graphs for various conditions like apnea, hyperventilation, and hypoventilation, aiding in understanding capnography.

**Highlights:** ETCO2 monitoring explanation, Capnography and capnograph details, Apnea graph visualization, Hyperventilation graph visualization, Hypoventilation graph visualization, Graphs for various medical conditions

**Features:** macOS Compatibility, Vision Pro support

**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 ETCO2 Tutor free?

ETCO2 Tutor 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, ETCO2 Tutor or VentRef?

ETCO2 Tutor and VentRef are both rated 5.0 out of 5 on the App Store, from 2 and 44 ratings respectively.

### Do ETCO2 Tutor or VentRef have ads?

Neither ETCO2 Tutor nor VentRef shows ads.

### Which is updated more often, ETCO2 Tutor or VentRef?

ETCO2 Tutor ships an update every 5 months, and VentRef every 3 weeks. Most recently, ETCO2 Tutor was updated on October 4, 2026 and VentRef on October 10, 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.*