# ETCO2 Tutor vs Respiratory Notes

The clearest difference is rating: ETCO2 Tutor at 5.0 against Respiratory Notes's 4.0. ETCO2 Tutor also leads on in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume, update cadence and device support there is nothing between them.

Both are free to download. Respiratory Notes sells 1 in-app purchase, starting at $39.99 per year. ETCO2 Tutor asks for nothing beyond the download.

ETCO2 Tutor holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

ETCO2 Tutor ships an update every 5 months, Respiratory Notes every 6 months. The most recent releases landed on October 4, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | ETCO2 Tutor | Respiratory Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/etco2-tutor/id1047646888/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/respiratory-notes/id6569241898/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 33 MB | 47 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Satish Deopujari](https://appshunter.io/developer/1180072702) | [Skyscape Medpresso Inc](https://appshunter.io/developer/818609416) |

## 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


### Respiratory Notes

[App page](https://appshunter.io/ios/app/respiratory-notes/id6569241898)

This app provides a comprehensive, procedure-based reference for respiratory therapy information. It includes illustrations, forms, and algorithms to aid in study and practice, with content organized around protocols and new pulmonary disease tabs. An in-app purchase unlocks all content, and a subscription offers continuous updates.

**Highlights:** Procedure-based format, Supporting illustrations and tables, Fill-in-the-blank forms, Algorithms based on AARC Guidelines, SmartSearch technology, Offline content access

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Respiratory Notes | $39.99 | per year |


## Frequently asked questions

### Is ETCO2 Tutor free?

ETCO2 Tutor is free to download, with no in-app purchases.

### Is Respiratory Notes free?

Respiratory Notes is free to download, with in-app purchases available.

### Which has better reviews, ETCO2 Tutor or Respiratory Notes?

ETCO2 Tutor is rated higher. ETCO2 Tutor averages 5.0 out of 5 from 2 ratings, while Respiratory Notes averages 4.0 from 4 ratings.

### Do ETCO2 Tutor or Respiratory Notes have ads?

Respiratory Notes shows ads; ETCO2 Tutor does not.

### Which is updated more often, ETCO2 Tutor or Respiratory Notes?

ETCO2 Tutor ships an update every 5 months, and Respiratory Notes every 6 months. Most recently, ETCO2 Tutor was updated on October 4, 2026 and Respiratory Notes on September 30, 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.*