# PREP（プレップ） vs tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報

The clearest difference is review sentiment: tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 at 72% against PREP（プレップ）'s 29%. tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 also leads on rating (4.5 vs 2.3) and update cadence (weekly vs every 6 weeks). On price, ads, in-app purchases and monetization model 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 tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 sells 1 in-app purchase, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 holds the better App Store score, 4.5 against 2.3. That said, the two scores are not equally well evidenced: tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 has 70 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 29% of PREP（プレップ）'s written reviews are positive against 72% of tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報's.

PREP（プレップ） ships an update every 6 weeks, tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 weekly. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | PREP（プレップ） | tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (6 ratings)](https://appshunter.io/ios/app/prep/id398954883/reviews) | **[4.5 (70 ratings)](https://appshunter.io/ios/app/tenkijp/id433865746/reviews)** |
| Number of ratings | 6 | **70** |
| Positive reviews | 29.1% of reviews | **72.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | **#132** |
| Size | 90 MB | 241 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RC Solution Co.](https://appshunter.io/developer/398954886) | [一般財団法人 日本気象協会](https://appshunter.io/developer/433865749) |

## 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 |


### tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報

[App page](https://appshunter.io/ios/app/tenkijp/id433865746)

**Currently charting:** #132 Top Free · Weather (US App Store)

Get detailed weather forecasts, real-time rain cloud radar, and earthquake alerts from an official Japanese meteorological source. Earn points for checking the weather and access disaster preparedness information. Offers a premium subscription for an ad-free experience and enhanced notifications.

**Highlights:** Detailed hourly and 14-day weather forecasts, Real-time rain cloud and lightning radar, Earthquake, typhoon, and tsunami alerts, Weather expert commentary and articles, Customizable lifestyle indices (clothing, heatstroke, etc.), Weather forecast widgets, Point rewards for usage

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| tenki.jpライト（月額プラン） | $1.99 | per month |


## 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 tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 free?

tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 is free to download, with in-app purchases available.

### Which has better reviews, PREP（プレップ） or tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報?

tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 is rated higher. PREP（プレップ） averages 2.3 out of 5 from 6 ratings, while tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 averages 4.5 from 70 ratings.

### Do PREP（プレップ） or tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 have ads?

Both PREP（プレップ） and tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 show ads.

### Which is updated more often, PREP（プレップ） or tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報?

PREP（プレップ） ships an update every 6 weeks, and tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 weekly. Most recently, PREP（プレップ） was updated on September 23, 2026 and tenki.jp 天気予報・雨雲レーダー/地震速報・台風情報 on September 22, 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.*