# Hazardon vs 河川カメラ

The clearest difference is rating: 河川カメラ at 5.0 against Hazardon's 3.2. Hazardon's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price, review sentiment, update cadence and device support there is nothing between them.

Both are free to download. 河川カメラ sells 4 one-off in-app purchases. Hazardon asks for nothing beyond the download.

河川カメラ holds the better App Store score, 5.0 against 3.2. That said, the two scores are not equally well evidenced: Hazardon has 59 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 21% of Hazardon's written reviews are positive against 24% of 河川カメラ's.

Hazardon ships an update every 11 days, 河川カメラ every 2 weeks. The most recent releases landed on September 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Hazardon | 河川カメラ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (59 ratings)](https://appshunter.io/ios/app/hazardon/id1366092460/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/river/id1566760183/reviews)** |
| Number of ratings | **59** | 1 |
| Positive reviews | 21.4% of reviews | **24.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 11 days** | Every 2 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 19 MB | 110 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Arcadia, Inc.](https://appshunter.io/developer/382203159) | [hidehiko aihara](https://appshunter.io/developer/1178520609) |

## What reviewers say

### Hazardon

[App page](https://appshunter.io/ios/app/hazardon/id1366092460)

This app provides a map of evacuation shelters nationwide, hazard maps, and notifications from local governments. It offers real-time disaster information and alerts for various natural disasters, including those developed through joint research with Kitakyushu City.

**Highlights:** Nationwide evacuation shelter map, Hazard map display (9 types), Real-time disaster alerts, Push notifications for weather and disaster information, Multilingual support (13 languages), Evacuation shelter status, Road closure information

**Features:** Vision Pro support

**In-app purchases:** none


### 河川カメラ

[App page](https://appshunter.io/ios/app/river/id1566760183)

Access real-time river conditions and weather forecasts across Japan. View over 10,000 river locations on a map and check detailed precipitation, temperature, and snow data. Stay informed about weather changes to prepare for heavy rain and other natural events.

**Highlights:** Real-time river information map, Over 10,000 river locations, Live camera stills of rivers, Automatic and manual data updates, Detailed weather forecasts, Rainfall intensity visualization, Favorite locations

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee (Regular) | $0.49 | one-time |
| 開発者応援 | $1.99 | one-time |
| Coffee (Large) | $1.99 | one-time |
| Cake Set | $5.99 | one-time |


## Frequently asked questions

### Is Hazardon free?

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

### Is 河川カメラ free?

河川カメラ is free to download, with in-app purchases available.

### Which has better reviews, Hazardon or 河川カメラ?

河川カメラ is rated higher. Hazardon averages 3.2 out of 5 from 59 ratings, while 河川カメラ averages 5.0 from 1 ratings.

### Do Hazardon or 河川カメラ have ads?

河川カメラ shows ads; Hazardon does not.

### Which is updated more often, Hazardon or 河川カメラ?

Hazardon ships an update every 11 days, and 河川カメラ every 2 weeks. Most recently, Hazardon was updated on September 10, 2026 and 河川カメラ on September 23, 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.*