# PM2.5と黄砂の予測 大気汚染予報 vs 頭痛日記 henz

The clearest difference is review sentiment: 頭痛日記 henz at 100% against PM2.5と黄砂の予測 大気汚染予報's 48%. 頭痛日記 henz also leads on update cadence (every 2 weeks vs monthly) and iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PM2.5と黄砂の予測 大気汚染予報 ships an update monthly, 頭痛日記 henz every 2 weeks. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | PM2.5と黄砂の予測 大気汚染予報 | 頭痛日記 henz |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/henz-2/id1630871178/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 48.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Ad-supported | Ad-supported |
| Size | 11 MB | 30 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Noriki Fujiwara](https://appshunter.io/developer/631049883) | [Takumi Sugihara](https://appshunter.io/developer/1543700190) |

## What reviewers say

### PM2.5と黄砂の予測 大気汚染予報

[App page](https://appshunter.io/ios/app/pm25/id631049880)

This app displays air quality forecasts for PM2.5 and yellow dust, presented in a weather forecast style by prefecture. It also provides real-time data from the Ministry of the Environment's "Soramame-kun" system. Visual indicators show air quality levels from clean to alert.

**Highlights:** PM2.5 and yellow dust forecasts, Prefecture-based weather forecast style, Real-time data from Soramame-kun, Visual air quality indicators, Clean to alert level display

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

**In-app purchases:** none


### 頭痛日記 henz

[App page](https://appshunter.io/ios/app/henz-2/id1630871178)

This application allows users to easily record and track migraine and headache occurrences. It also supports logging periodic physical condition records, with a calendar view for reviewing past entries.

**Highlights:** Migraine recording, Headache tracking, Physical condition logging, Calendar review, Multiple daily records

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PM2.5と黄砂の予測 大気汚染予報 free?

PM2.5と黄砂の予測 大気汚染予報 is free to download, with no in-app purchases.

### Is 頭痛日記 henz free?

頭痛日記 henz is free to download, with no in-app purchases.

### Do PM2.5と黄砂の予測 大気汚染予報 or 頭痛日記 henz have ads?

Both PM2.5と黄砂の予測 大気汚染予報 and 頭痛日記 henz show ads.

### Which is updated more often, PM2.5と黄砂の予測 大気汚染予報 or 頭痛日記 henz?

PM2.5と黄砂の予測 大気汚染予報 ships an update monthly, and 頭痛日記 henz every 2 weeks. Most recently, PM2.5と黄砂の予測 大気汚染予報 was updated on October 15, 2026 and 頭痛日記 henz on October 5, 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.*