# O2Quality vs AirQualityMeter

The clearest difference is review sentiment: O2Quality at 100% against AirQualityMeter's 50%. O2Quality also leads on ads (none vs shown) and monetization model (free vs ad-supported). AirQualityMeter's advantage is iOS requirement (16.6 vs 27.0). On price, update cadence, 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.

O2Quality ships an update every 5 months, AirQualityMeter every 3 months. The most recent releases landed on September 22, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | O2Quality | AirQualityMeter |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | **Free** | Ad-supported |
| Size | 11 MB | 8 MB |
| Requires iOS | 27.0 | **16.6** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Tomohiko Shimizu](https://appshunter.io/developer/436129129) | [Yuta Endo](https://appshunter.io/developer/1621719139) |

## 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


### AirQualityMeter

[App page](https://appshunter.io/ios/app/airqualitymeter/id1660451275)

This app provides real-time air quality measurements and forecasts up to 24 hours in advance. It helps users manage their physical condition and prepare for allergies by notifying them of pollutants like PM2.5 and PM10. Location services enable automatic weather data acquisition for your current area.

**Highlights:** Real-time air pollutant notifications (PM2.5, PM10), 24-hour air pollution level forecast, Global coverage, Automatic location-based weather data, Allergy countermeasure information

**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 AirQualityMeter free?

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

### Do O2Quality or AirQualityMeter have ads?

AirQualityMeter shows ads; O2Quality does not.

### Which is updated more often, O2Quality or AirQualityMeter?

O2Quality ships an update every 5 months, and AirQualityMeter every 3 months. Most recently, O2Quality was updated on September 22, 2026 and AirQualityMeter on September 1, 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.*