# 被害予測・防災cmap vs 河川カメラ

The clearest difference is rating: 河川カメラ at 5.0 against 被害予測・防災cmap's 3.6. 河川カメラ also leads on update cadence (every 2 weeks vs every 2 months). 被害予測・防災cmap's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price, review sentiment 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. 被害予測・防災cmap asks for nothing beyond the download.

河川カメラ holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: 被害予測・防災cmap has 98 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 27% of 被害予測・防災cmap's written reviews are positive against 24% of 河川カメラ's, so the app with the better star average is not the one people write more warmly about.

被害予測・防災cmap ships an update every 2 months, 河川カメラ every 2 weeks. The most recent releases landed on September 30, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | 被害予測・防災cmap | 河川カメラ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (98 ratings)](https://appshunter.io/ios/app/cmap/id1524623479/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/river/id1566760183/reviews)** |
| Number of ratings | **98** | 1 |
| Positive reviews | **26.9% of reviews** | 24.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 31 MB | 110 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aioi Nissay Dowa Insurance Co.,Ltd.](https://appshunter.io/developer/438886751) | [hidehiko aihara](https://appshunter.io/developer/1178520609) |

## What reviewers say

### 被害予測・防災cmap

[App page](https://appshunter.io/ios/app/cmap/id1524623479)

This app provides regional risk information, including natural disasters, accidents, and emergencies. It offers push notifications for disaster alerts, severe weather, and evacuation orders. Users can also access weather forecasts, life indicators, and hazard maps.

**Highlights:** Disaster risk prediction and mapping, Emergency and evacuation alerts, Severe weather notifications, Hazard map and evacuation site information, Weather forecasts and life indicators, Traffic and accessibility information

**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 被害予測・防災cmap free?

被害予測・防災cmap 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, 被害予測・防災cmap or 河川カメラ?

河川カメラ is rated higher. 被害予測・防災cmap averages 3.6 out of 5 from 98 ratings, while 河川カメラ averages 5.0 from 1 ratings.

### Do 被害予測・防災cmap or 河川カメラ have ads?

河川カメラ shows ads; 被害予測・防災cmap does not.

### Which is updated more often, 被害予測・防災cmap or 河川カメラ?

被害予測・防災cmap ships an update every 2 months, and 河川カメラ every 2 weeks. Most recently, 被害予測・防災cmap was updated on September 30, 2026 and 河川カメラ on October 2, 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.*