# PREP（プレップ） vs ないえナビ

The clearest difference is in-app purchases: ないえナビ at none against PREP（プレップ）'s 2. ないえナビ also leads on ads (none vs shown) and update cadence (daily vs every 6 weeks). On price and device support there is nothing between them.

Both are free to download. PREP（プレップ） sells 2 in-app purchases, starting at $0.99 per month. ないえナビ asks for nothing beyond the download.

PREP（プレップ） ships an update every 6 weeks, ないえナビ daily. The most recent releases landed on October 18, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | PREP（プレップ） | ないえナビ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (6 ratings)](https://appshunter.io/ios/app/prep/id398954883/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 29.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 90 MB | 88 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [RC Solution Co.](https://appshunter.io/developer/398954886) | [Naie Town](https://appshunter.io/developer/1849092066) |

## What reviewers say

### PREP（プレップ）

[App page](https://appshunter.io/ios/app/prep/id398954883)

This app provides real-time disaster information based on your current location, including alerts for earthquakes, tsunamis, and heavy rain. It helps you plan for disasters by allowing you to set action plans and share information with family members. The app also offers guidance during emergencies to ensure safe actions.

**Highlights:** Real-time disaster information by location, Disaster action planning, Emergency guidance, Family information sharing, Various disaster alerts (earthquake, tsunami, rain, etc.), Precipitation forecast timeline

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PREP Premium Service | $0.99 | per month |
| PREP ファミリーサービス | $3.49 | per month |


### ないえナビ

[App page](https://appshunter.io/ios/app/id6759386248)

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

**In-app purchases:** none


## Frequently asked questions

### Is PREP（プレップ） free?

PREP（プレップ） is free to download, with in-app purchases available.

### Is ないえナビ free?

ないえナビ is free to download, with no in-app purchases.

### Do PREP（プレップ） or ないえナビ have ads?

PREP（プレップ） shows ads; ないえナビ does not.

### Which is updated more often, PREP（プレップ） or ないえナビ?

PREP（プレップ） ships an update every 6 weeks, and ないえナビ daily. Most recently, PREP（プレップ） was updated on October 18, 2026 and ないえナビ on October 3, 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.*