# Sapporo’s Disaster Management vs 流域 / Ryuiki

The clearest difference is update cadence: 流域 / Ryuiki at every 2 days against Sapporo’s Disaster Management's every 2 months. On price, ads, 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.

Sapporo’s Disaster Management ships an update every 2 months, 流域 / Ryuiki every 2 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Sapporo’s Disaster Management | 流域 / Ryuiki |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 5.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 79 MB | 10 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [City of Sapporo](https://appshunter.io/developer/1174152672) | [KENTA TORIMOTO](https://appshunter.io/developer/1880253937) |

## What reviewers say

### Sapporo’s Disaster Management

[App page](https://appshunter.io/ios/app/sapporos-disaster-management/id1287976156)

This app provides crucial disaster information for residents and tourists in Sapporo. It offers details on earthquakes, typhoons, floods, evacuation sites, and weather warnings to help users prepare and respond effectively to emergencies.

**Highlights:** Disaster awareness and preparedness, City-wide hazard information, Evacuation site locations, Weather warnings, Information for residents and tourists

**Features:** Vision Pro support

**In-app purchases:** none


### 流域 / Ryuiki

[App page](https://appshunter.io/ios/app/ryuiki/id6759816013)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sapporo’s Disaster Management free?

Sapporo’s Disaster Management is free to download, with no in-app purchases.

### Is 流域 / Ryuiki free?

流域 / Ryuiki is free to download, with no in-app purchases.

### Do Sapporo’s Disaster Management or 流域 / Ryuiki have ads?

Neither Sapporo’s Disaster Management nor 流域 / Ryuiki shows ads.

### Which is updated more often, Sapporo’s Disaster Management or 流域 / Ryuiki?

Sapporo’s Disaster Management ships an update every 2 months, and 流域 / Ryuiki every 2 days. Most recently, Sapporo’s Disaster Management was updated on November 6, 2026 and 流域 / Ryuiki on October 31, 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.*