# Vyaire vs RTB2

The clearest difference is in-app purchases: Vyaire at none against RTB2's 1. Vyaire also leads on iOS requirement (13.0 vs 15.1). RTB2's advantage is update cadence (every 5 days vs every 40 months). On price, ads and device support there is nothing between them.

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

Vyaire ships an update every 40 months, RTB2 every 5 days. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Vyaire | RTB2 |
| --- | --- | --- |
| Price | Free | 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 40 months | **Every 5 days** |
| Monetization | — | Freemium |
| Size | 2 MB | 46 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [ZOLL Data Systems, Inc.](https://appshunter.io/developer/385812404) | [Bbytetechworks LLC](https://appshunter.io/developer/1844731958) |

## What reviewers say

### Vyaire

[App page](https://appshunter.io/ios/app/vyaire-concerto/id1589271201)

**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 Vyaire free?

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

### Is RTB2 free?

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

### Do Vyaire or RTB2 have ads?

Neither Vyaire nor RTB2 shows ads.

### Which is updated more often, Vyaire or RTB2?

Vyaire ships an update every 40 months, and RTB2 every 5 days. Most recently, Vyaire was updated on October 13, 2026 and RTB2 on October 12, 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.*