# O2Quality vs 花粉 週間予報

The clearest difference is review sentiment: O2Quality at 100% against 花粉 週間予報's 50%. O2Quality also leads on in-app purchases (none vs 5) and ads (none vs shown). 花粉 週間予報's advantage is update cadence (every 3 weeks vs every 4 months) and iOS requirement (15.6 vs 27.0). On price and device support there is nothing between them.

Both are free to download. 花粉 週間予報 sells 5 in-app purchases, starting at $2.99 per month. O2Quality asks for nothing beyond the download.

O2Quality ships an update every 4 months, 花粉 週間予報 every 3 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | O2Quality | 花粉 週間予報 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 73 MB |
| Requires iOS | 27.0 | **15.6** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tomohiko Shimizu](https://appshunter.io/developer/436129129) | [hidehiko aihara](https://appshunter.io/developer/1178520609) |

## 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


### 花粉 週間予報

[App page](https://appshunter.io/ios/app/id6478220308)

Get real-time pollen forecasts across Japan to plan your outings with confidence. View daily pollen levels in easy-to-understand graphs and check the weekly forecast to prepare for high pollen days. Save your favorite locations for quick access to local pollen information.

**Highlights:** Nationwide pollen information, Daily pollen levels graph, Weekly pollen forecast, Register favorite locations, Real-time pollen data

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告停止 | $2.99 | per month |
| Coffee (Regular) | $0.49 | one-time |
| Coffee (Large) | $1.99 | one-time |
| システム改善応援募金 | $1.99 | one-time |
| Cake Set | $5.99 | one-time |


## Frequently asked questions

### Is O2Quality free?

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

### Is 花粉 週間予報 free?

花粉 週間予報 is free to download, with in-app purchases available.

### Do O2Quality or 花粉 週間予報 have ads?

花粉 週間予報 shows ads; O2Quality does not.

### Which is updated more often, O2Quality or 花粉 週間予報?

O2Quality ships an update every 4 months, and 花粉 週間予報 every 3 weeks. Most recently, O2Quality was updated on November 3, 2026 and 花粉 週間予報 on November 4, 2026.

---

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