# VentRef vs RTB2

The clearest difference is in-app purchases: VentRef at none against RTB2's 1. VentRef also leads on ratings volume (42 vs 2). RTB2's advantage is update cadence (every 5 days vs every 3 weeks) and iOS requirement (15.1 vs 26.0). 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. VentRef asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for VentRef against 5.0 for RTB2. That said, the two scores are not equally well evidenced: VentRef has 42 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.

VentRef ships an update every 3 weeks, RTB2 every 5 days. The most recent releases landed on September 23, 2026 and June 17, 2026 respectively.

## The numbers

| Metric | VentRef | RTB2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (42 ratings)](https://appshunter.io/ios/app/ventref/id6756503414/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/rtb2-respiratory-reference/id6757658847/reviews) |
| Number of ratings | **42** | 2 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | **Free** | Freemium |
| Size | 27 MB | 46 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Rishi Kumar](https://appshunter.io/developer/1434016052) | [Bbytetechworks LLC](https://appshunter.io/developer/1844731958) |

## What reviewers say

### VentRef

[App page](https://appshunter.io/ios/app/ventref/id6756503414)

A clinical reference tool for healthcare professionals managing mechanical ventilation and oxygen therapy. It provides information grounded in respiratory physiology and evidence-based critical care.

**Highlights:** Mechanical ventilation reference, Oxygen therapy reference, Respiratory physiology, Evidence-based critical care, Clinical decision support

**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 VentRef free?

VentRef 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, VentRef or RTB2?

VentRef and RTB2 are both rated 5.0 out of 5 on the App Store, from 42 and 2 ratings respectively.

### Do VentRef or RTB2 have ads?

Neither VentRef nor RTB2 shows ads.

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

VentRef ships an update every 3 weeks, and RTB2 every 5 days. Most recently, VentRef was updated on September 23, 2026 and RTB2 on June 17, 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.*