# Rapid Vent Calculator vs RTB2

The clearest difference is in-app purchases: Rapid Vent Calculator at none against RTB2's 1. Rapid Vent Calculator also leads on ratings volume (47 vs 2) and iOS requirement (13.0 vs 15.1). RTB2's advantage is update cadence (every 5 days vs every 4 months). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. RTB2 sells 1 in-app purchase, starting at $2.99 per month. Rapid Vent Calculator asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Rapid Vent Calculator against 5.0 for RTB2. That said, the two scores are not equally well evidenced: Rapid Vent Calculator has 47 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.

Rapid Vent Calculator ships an update every 4 months, RTB2 every 5 days. The most recent releases landed on October 7, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Rapid Vent Calculator | RTB2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (47 ratings)](https://appshunter.io/ios/app/rapid-vent-calculator/id6451494244/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/rtb2-respiratory-reference/id6757658847/reviews) |
| Number of ratings | **47** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | **Free** | Freemium |
| Size | 48 MB | 46 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [JENCO LLC](https://appshunter.io/developer/1698545004) | [Bbytetechworks LLC](https://appshunter.io/developer/1844731958) |

## What reviewers say

### Rapid Vent Calculator

[App page](https://appshunter.io/ios/app/rapid-vent-calculator/id6451494244)

This medical app assists healthcare professionals in calculating essential ventilator settings and medication dosages for critical care. It provides rapid, accurate results for paramedics, respiratory therapists, nurses, and doctors, streamlining patient management.

**Highlights:** Effortless ventilator settings calculation, Rapid results for quick decision-making, RSI medication dosage assistant, User-friendly interface for medical professionals, Accurate patient parameter input

**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 Rapid Vent Calculator free?

Rapid Vent Calculator is free to download, with no in-app purchases.

### Is RTB2 free?

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

### Which has better reviews, Rapid Vent Calculator or RTB2?

Rapid Vent Calculator and RTB2 are both rated 5.0 out of 5 on the App Store, from 47 and 2 ratings respectively.

### Do Rapid Vent Calculator or RTB2 have ads?

Neither Rapid Vent Calculator nor RTB2 shows ads.

### Which is updated more often, Rapid Vent Calculator or RTB2?

Rapid Vent Calculator ships an update every 4 months, and RTB2 every 5 days. Most recently, Rapid Vent Calculator was updated on October 7, 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.*