# Catheter vs Respiratory Notes

The clearest difference is price: Respiratory Notes at Free against Catheter's $0.99. Respiratory Notes also leads on update cadence (every 6 months vs every 26 months) and iOS requirement (13.0 vs 17.0). Catheter's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Respiratory Notes is free to download; Catheter costs $0.99 up front. Respiratory Notes sells 1 in-app purchase, starting at $39.99 per year. Catheter asks for nothing beyond the download.

Catheter ships an update every 26 months, Respiratory Notes every 6 months. The most recent releases landed on November 11, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Catheter | Respiratory Notes |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.0 (4 ratings)](https://appshunter.io/ios/app/respiratory-notes/id6569241898/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 26 months | **Every 6 months** |
| Monetization | — | Free with in-app purchases |
| Size | 21 MB | 47 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Michael Buckner](https://appshunter.io/developer/746425887) | [Skyscape Medpresso Inc](https://appshunter.io/developer/818609416) |

## What reviewers say

### Catheter

[App page](https://appshunter.io/ios/app/catheter-patient-version/id796618275)

**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 Catheter free?

Catheter costs $0.99, with no in-app purchases.

### Is Respiratory Notes free?

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

### Do Catheter or Respiratory Notes have ads?

Respiratory Notes shows ads; Catheter does not.

### Which is updated more often, Catheter or Respiratory Notes?

Catheter ships an update every 26 months, and Respiratory Notes every 6 months. Most recently, Catheter was updated on November 11, 2026 and Respiratory Notes on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*