# PREP（プレップ） vs MyShake Earthquake Alerts

The clearest difference is rating: MyShake Earthquake Alerts at 3.3 against PREP（プレップ）'s 2.3. MyShake Earthquake Alerts also leads on in-app purchases (none vs 2) and ads (none vs shown). PREP（プレップ）'s advantage is update cadence (every 6 weeks vs every 3 months). On price, device support and iOS requirement 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. MyShake Earthquake Alerts asks for nothing beyond the download.

MyShake Earthquake Alerts holds the better App Store score, 3.3 against 2.3. That said, the two scores are not equally well evidenced: MyShake Earthquake Alerts has 1.9K 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 52% of MyShake Earthquake Alerts's.

PREP（プレップ） ships an update every 6 weeks, MyShake Earthquake Alerts every 3 months. The most recent releases landed on September 23, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | PREP（プレップ） | MyShake Earthquake Alerts |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (6 ratings)](https://appshunter.io/ios/app/prep/id398954883/reviews) | **[3.3 (1.9K ratings)](https://appshunter.io/ios/app/myshake-earthquake-alerts/id1467058529/reviews)** |
| Number of ratings | 6 | **1.9K** |
| Positive reviews | 29.1% of reviews | **51.6% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | — | **#58** |
| Size | 90 MB | 135 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RC Solution Co.](https://appshunter.io/developer/398954886) | [University of California, Berkeley](https://appshunter.io/developer/413373017) |

## 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 |


### MyShake Earthquake Alerts

[App page](https://appshunter.io/ios/app/myshake-earthquake-alerts/id1467058529)

**Currently charting:** #58 Top Free · Weather (US App Store)

Get timely earthquake early warnings for California, Oregon, and Washington. Access safety tips, explore global earthquake data on a map, and contribute to a citizen-science seismic network. Receive notifications for earthquakes based on your region and magnitude preferences.

**Highlights:** Earthquake Early Warnings, Earthquake Safety Tips, Global Earthquake Map, Customizable Notifications, Citizen-Science Seismic Network, Multilingual Support

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Early earthquake warning
- 👍 Useful for earthquake preparedness
- 🚨 Alerts before shaking starts
- 🗺️ Detailed earthquake information
- 🤖 Automated reporting of felt earthquakes

**What reviewers complain about**

- 🐛 Unreliable notifications
- 🔔 Excessive or unnecessary alerts
- 🔋 High battery consumption
- 🗺️ Difficult to filter by location
- 🤖 Inability to report felt earthquakes

**Reported bugs**

- App freezing or crashing when reporting earthquakes
- Inconsistent or outdated earthquake data
- Location services not working as expected

**Requested features**

- Customizable alert settings by location
- Louder and more distinct alert sounds
- Support for iPad and tablet devices
- Ability to view historical earthquake data
- Integration with other emergency systems


## 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 MyShake Earthquake Alerts free?

MyShake Earthquake Alerts is free to download, with no in-app purchases.

### Which has better reviews, PREP（プレップ） or MyShake Earthquake Alerts?

MyShake Earthquake Alerts is rated higher. PREP（プレップ） averages 2.3 out of 5 from 6 ratings, while MyShake Earthquake Alerts averages 3.3 from 1.9K ratings.

### Do PREP（プレップ） or MyShake Earthquake Alerts have ads?

PREP（プレップ） shows ads; MyShake Earthquake Alerts does not.

### Which is updated more often, PREP（プレップ） or MyShake Earthquake Alerts?

PREP（プレップ） ships an update every 6 weeks, and MyShake Earthquake Alerts every 3 months. Most recently, PREP（プレップ） was updated on September 23, 2026 and MyShake Earthquake Alerts on September 26, 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.*