# ROX Index vs Safe Vent

The clearest difference is in-app purchases: ROX Index at none against Safe Vent's 2. ROX Index also leads on update cadence (every 3 weeks vs every 3 months) and iOS requirement (11.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. Safe Vent sells 2 in-app purchases, starting at $2.99 per month. ROX Index asks for nothing beyond the download.

ROX Index ships an update every 3 weeks, Safe Vent every 3 months. The most recent releases landed on October 10, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | ROX Index | Safe Vent |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rox-index/id1582208777/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 10 MB | 58 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Satish Deopujari](https://appshunter.io/developer/1180072702) | [SYNAPS AI SAS](https://appshunter.io/developer/1710831235) |

## What reviewers say

### ROX Index

[App page](https://appshunter.io/ios/app/rox-index/id1582208777)

This medical app assists doctors and students in calculating the ROX index, a tool to predict the success or failure of High-Flow Nasal Cannula (HFNC) therapy, primarily studied in pneumonia patients. It simplifies the calculation using SpO2, FiO2, and Respiratory Rate.

**Highlights:** ROX index calculation, Predicts HFNC success/failure, Primarily for pneumonia patients, Uses SpO2, FiO2, and RR, Assists doctors and medical students

**Features:** macOS Compatibility

**In-app purchases:** none


### Safe Vent

[App page](https://appshunter.io/ios/app/safe-vent/id6468893543)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Safe Vent Full Access | $2.99 | per month |
| Safe Vent Full Access | $29.99 | per year |


## Frequently asked questions

### Is ROX Index free?

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

### Is Safe Vent free?

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

### Do ROX Index or Safe Vent have ads?

Neither ROX Index nor Safe Vent shows ads.

### Which is updated more often, ROX Index or Safe Vent?

ROX Index ships an update every 3 weeks, and Safe Vent every 3 months. Most recently, ROX Index was updated on October 10, 2026 and Safe Vent on September 11, 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.*