# 亀の瀬地すべりナビ vs DisasterPreparednessDrillBook

The clearest difference is update cadence: DisasterPreparednessDrillBook at every 6 days against 亀の瀬地すべりナビ's every 3 weeks. 亀の瀬地すべりナビ's advantage is iOS requirement (13.0 vs 17.0). 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.

亀の瀬地すべりナビ ships an update every 3 weeks, DisasterPreparednessDrillBook every 6 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | 亀の瀬地すべりナビ | DisasterPreparednessDrillBook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Size | 1.3 GB | 89 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [YAMATOGAWA RIVER OFFICE](https://appshunter.io/developer/1651623844) | [RCRDM, Iwate Univ.](https://appshunter.io/developer/1816349496) |

## What reviewers say

### 亀の瀬地すべりナビ

[App page](https://appshunter.io/ios/app/id1673710791)

**Features:** macOS Compatibility

**In-app purchases:** none


### DisasterPreparednessDrillBook

[App page](https://appshunter.io/ios/app/disasterpreparednessdrillbook/id6746351170)

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

**In-app purchases:** none


## Frequently asked questions

### Is 亀の瀬地すべりナビ free?

亀の瀬地すべりナビ is free to download, with no in-app purchases.

### Is DisasterPreparednessDrillBook free?

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

### Do 亀の瀬地すべりナビ or DisasterPreparednessDrillBook have ads?

Neither 亀の瀬地すべりナビ nor DisasterPreparednessDrillBook shows ads.

### Which is updated more often, 亀の瀬地すべりナビ or DisasterPreparednessDrillBook?

亀の瀬地すべりナビ ships an update every 3 weeks, and DisasterPreparednessDrillBook every 6 days. Most recently, 亀の瀬地すべりナビ was updated on November 3, 2026 and DisasterPreparednessDrillBook on November 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.*