# インフルエンザ予報計 vs O2Quality

The clearest difference is review sentiment: O2Quality at 100% against インフルエンザ予報計's 50%. O2Quality also leads on ads (none vs shown). インフルエンザ予報計's advantage is iOS requirement (15.6 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.

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on September 21, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | インフルエンザ予報計 | O2Quality |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | — | Free |
| Size | 8 MB | 11 MB |
| Requires iOS | **15.6** | 27.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Takahiro Izaki](https://appshunter.io/developer/511591595) | [Tomohiko Shimizu](https://appshunter.io/developer/436129129) |

## What reviewers say

### インフルエンザ予報計

[App page](https://appshunter.io/ios/app/id733300038)

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is インフルエンザ予報計 free?

インフルエンザ予報計 is free to download, with no in-app purchases.

### Is O2Quality free?

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

### Do インフルエンザ予報計 or O2Quality have ads?

インフルエンザ予報計 shows ads; O2Quality does not.

### Which is updated more often, インフルエンザ予報計 or O2Quality?

インフルエンザ予報計 ships an update every 5 months, and O2Quality every 5 months. Most recently, インフルエンザ予報計 was updated on September 21, 2026 and O2Quality on September 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*