# PREP（プレップ） vs そら案内

The clearest difference is rating: そら案内 at 4.8 against PREP（プレップ）'s 2.3. そら案内 also leads on update cadence (every 3 weeks vs every 6 weeks). PREP（プレップ）'s advantage is review sentiment (29% vs 20%) and iOS requirement (15.0 vs 17.0). On price, ratings volume, ads and in-app purchases 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 and そら案内 sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

そら案内 holds the better App Store score, 4.8 against 2.3. Both are backed by a comparable volume of ratings — 6 and 8 respectively. Written reviews complicate that: 29% of PREP（プレップ）'s written reviews are positive against 20% of そら案内's, so the app with the better star average is not the one people write more warmly about.

PREP（プレップ） ships an update every 6 weeks, そら案内 every 3 weeks. The most recent releases landed on October 14, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | PREP（プレップ） | そら案内 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (6 ratings)](https://appshunter.io/ios/app/prep/id398954883/reviews) | **[4.8 (8 ratings)](https://appshunter.io/ios/app/id1046448102/reviews)** |
| Number of ratings | 6 | **8** |
| Positive reviews | **29.1% of reviews** | 20.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 90 MB | 112 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [RC Solution Co.](https://appshunter.io/developer/398954886) | [sorakaze Inc.](https://appshunter.io/developer/1046448101) |

## 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 |


### そら案内

[App page](https://appshunter.io/ios/app/id1046448102)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| そら案内プラス | $0.99 | per month |
| そら案内プラス | $6.99 | per year |
| 拡張パック:旧バージョンユーザ向け | Free | one-time |
| 拡張パック | $2.99 | one-time |


## 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 そら案内 free?

そら案内 is free to download, with in-app purchases available.

### Which has better reviews, PREP（プレップ） or そら案内?

そら案内 is rated higher. PREP（プレップ） averages 2.3 out of 5 from 6 ratings, while そら案内 averages 4.8 from 8 ratings.

### Do PREP（プレップ） or そら案内 have ads?

Both PREP（プレップ） and そら案内 show ads.

### Which is updated more often, PREP（プレップ） or そら案内?

PREP（プレップ） ships an update every 6 weeks, and そら案内 every 3 weeks. Most recently, PREP（プレップ） was updated on October 14, 2026 and そら案内 on October 9, 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.*