# O2Quality vs Safe Breath

The clearest difference is ads: O2Quality at none against Safe Breath's shown. Safe Breath's advantage is iOS requirement (11.0 vs 27.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | O2Quality | Safe Breath |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | — |
| Monetization | Free | — |
| Size | 11 MB | 43 MB |
| Requires iOS | 27.0 | **11.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tomohiko Shimizu](https://appshunter.io/developer/436129129) | [Vida Apps Incorporated](https://appshunter.io/developer/1580682451) |

## What reviewers say

### O2Quality

[App page](https://appshunter.io/ios/app/o2quality/id1570058656)

Provides real-time air quality information based on US and European Air Quality Index (AQI) standards. It forecasts pollutant levels for up to five days, including carbon monoxide, ozone, nitrogen dioxide, sulfur dioxide, PM2.5, and PM10.

**Highlights:** Real-time AQI reporting, US and European AQI standards, Forecasts for 6 pollutants, 5-day pollutant forecasts, Color-coded risk levels, Pollutant concentration data

**Features:** Vision Pro support

**In-app purchases:** none


### Safe Breath

[App page](https://appshunter.io/ios/app/safe-breath/id6475685023)

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

**In-app purchases:** none


## Frequently asked questions

### Is O2Quality free?

O2Quality is free to download, with no in-app purchases.

### Is Safe Breath free?

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

### Do O2Quality or Safe Breath have ads?

Safe Breath shows ads; O2Quality does not.

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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.*