# 週間天気予報 Sunny vs O2Quality

The clearest difference is review sentiment: O2Quality at 100% against 週間天気予報 Sunny's 33%. O2Quality also leads on ads (none vs shown) and monetization model (free vs ad-supported). 週間天気予報 Sunny's advantage is update cadence (every 2 months vs every 5 months) and iOS requirement (16.0 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.

週間天気予報 Sunny ships an update every 2 months, O2Quality every 5 months. Both last shipped on September 22, 2026.

## The numbers

| Metric | 週間天気予報 Sunny | O2Quality |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/sunny/id1448102526/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 33.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Ad-supported | **Free** |
| Size | 56 MB | 11 MB |
| Requires iOS | **16.0** | 27.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [NilCraft Inc.](https://appshunter.io/developer/458823527) | [Tomohiko Shimizu](https://appshunter.io/developer/436129129) |

## What reviewers say

### 週間天気予報 Sunny

[App page](https://appshunter.io/ios/app/sunny/id1448102526)

This weather app displays daily essential weather and pollen forecasts on a single screen. It accurately captures weather changes using the latest data and is easy to use by setting your area via location information. It's ideal for quickly checking temperature and weather for your busy morning routine.

**Highlights:** Single-screen weather and pollen forecast, High visibility design, Detailed pollen dispersion status, Accurate weather change tracking, Location-based area setting, Quick temperature and weather checks

**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 週間天気予報 Sunny free?

週間天気予報 Sunny is free to download, with no in-app purchases.

### Is O2Quality free?

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

### Do 週間天気予報 Sunny or O2Quality have ads?

週間天気予報 Sunny shows ads; O2Quality does not.

### Which is updated more often, 週間天気予報 Sunny or O2Quality?

週間天気予報 Sunny ships an update every 2 months, and O2Quality every 5 months. Most recently, 週間天気予報 Sunny was updated on September 22, 2026 and O2Quality on September 22, 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.*