# Respiratory Assistant vs RTB2

The clearest difference is price: RTB2 at Free against Respiratory Assistant's $3.99. RTB2 also leads on update cadence (every 5 days vs every 3 weeks). Respiratory Assistant's advantage is in-app purchases (none vs 1) and chart position (#196 vs unranked). On ads and device support there is nothing between them.

RTB2 is free to download; Respiratory Assistant costs $3.99 up front. RTB2 sells 1 in-app purchase, starting at $2.99 per month. Respiratory Assistant asks for nothing beyond the download.

Respiratory Assistant ships an update every 3 weeks, RTB2 every 5 days. The most recent releases landed on October 1, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Respiratory Assistant | RTB2 |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/rtb2-respiratory-reference/id6757658847/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | — | Freemium |
| Best chart rank | **#196** | — |
| Size | 31 MB | 46 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | +17 | 4+ |
| Developer | [Neural Hound, Ltd.](https://appshunter.io/developer/1855147431) | [Bbytetechworks LLC](https://appshunter.io/developer/1844731958) |

## What reviewers say

### Respiratory Assistant

[App page](https://appshunter.io/ios/app/respiratory-assistant/id6755638455)

**Currently charting:** #196 Top Paid · Medical (US App Store)

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

**In-app purchases:** none


### RTB2

[App page](https://appshunter.io/ios/app/rtb2-respiratory-reference/id6757658847)

This medical reference app provides respiratory therapists and students with essential clinical tools. It features ventilator mode guides, therapy calculators, and oxygen guidance in a clean, organized format for quick access in critical care settings.

**Highlights:** Ventilator mode reference guides, Respiratory therapy clinical calculators, Oxygen device guidance, Structured respiratory care information, Fast clinical review format, Advanced calculators (Pro)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RTB2 Pro | $2.99 | per month |


## Frequently asked questions

### Is Respiratory Assistant free?

Respiratory Assistant costs $3.99, with no in-app purchases.

### Is RTB2 free?

RTB2 is free to download, with in-app purchases available.

### Do Respiratory Assistant or RTB2 have ads?

Neither Respiratory Assistant nor RTB2 shows ads.

### Which is updated more often, Respiratory Assistant or RTB2?

Respiratory Assistant ships an update every 3 weeks, and RTB2 every 5 days. Most recently, Respiratory Assistant was updated on October 1, 2026 and RTB2 on September 26, 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.*