# O2Quality vs 花粉メーター

The clearest difference is in-app purchases: O2Quality at none against 花粉メーター's 1. O2Quality also leads on review sentiment (100% vs 80%) and device support (3 vs 1). 花粉メーター's advantage is update cadence (daily vs every 5 months) and iOS requirement (17.2 vs 27.0). On price and ads there is nothing between them.

Both are free to download. 花粉メーター sells 1 in-app purchase, starting at $7.99 per 7 days. O2Quality asks for nothing beyond the download.

O2Quality ships an update every 5 months, 花粉メーター daily. The most recent releases landed on September 22, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | O2Quality | 花粉メーター |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/id6743336918/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **100.0% of reviews** | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Daily** |
| Monetization | **Free** | Freemium |
| Size | 11 MB | 20 MB |
| Requires iOS | 27.0 | **17.2** |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tomohiko Shimizu](https://appshunter.io/developer/436129129) | [Baigen INC](https://appshunter.io/developer/1676579619) |

## 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


### 花粉メーター

[App page](https://appshunter.io/ios/app/id6743336918)

Get highly accurate pollen forecasts based on global data and Google Maps technology. Track pollen levels for specific plants and locations up to 5 days in advance, with personalized advice to manage your hay fever.

**Highlights:** High-accuracy global pollen forecast data, Up to 3 location registrations, 5-day pinpoint pollen forecast, Plant-specific pollen level display, Detailed area registration for precise forecasts, Life advice based on pollen levels

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $7.99 | per 7 days |


## Frequently asked questions

### Is O2Quality free?

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

### Is 花粉メーター free?

花粉メーター is free to download, with in-app purchases available.

### Do O2Quality or 花粉メーター have ads?

Neither O2Quality nor 花粉メーター shows ads.

### Which is updated more often, O2Quality or 花粉メーター?

O2Quality ships an update every 5 months, and 花粉メーター daily. Most recently, O2Quality was updated on September 22, 2026 and 花粉メーター on September 16, 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.*