Comparison

PREP(プレップ) vs MyShake Earthquake Alerts

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PREP(プレップ)

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
Read full description

PREP is currently available in Japanese only. If you have Yurekuru Call and prefer English, we recommend keeping your current version. Thank you for your patience and we are working hard to support English as soon as possible. ◆ PREPのポイント  - 現在地と連動してリアルタイムな災害情報を表示します。  - 災害時の行動方針をあらかじめ決めておくことができます。  - 災害発生時、安全な行動を取れるようにガイダンスを表示してサポートします。 ◆ PREPでできること 1.さまざまな災害に対応 災害情報を届ける「ライブ」機能 地震・津波・台風・大雨・噴火など、さまざまな災害情報や避難情報に対応。 現在地に応じたリアルタイムな情報を届けます。 最大24時間先までの降水情報を表示するタイムライン機能も搭載しています。 2.知るから、行動するへ 防災計画を立て、災害時の行動を支援する「アクション」機能 災害発生時にどのような行動を取ればいいかをあらかじめ検討したり、避難場所や防災用品を登録することができます。 大規模災害が予想される場合は、事前に登録した情報に応じて避難のガイダンスを表示し、災害発生時の行動をサポートします。 同居の家族最大6人と情報共有 ファミリープラン(有料)に登録すると、事前に検討した防災計画や、災害発生時の安否を同居の家族と共有できます。 ◆ PREPがあつかう災害情報 - 地震情報(緊急地震速報) - 津波情報 - 噴火速報・警報 - 降水情報 - 指定河川洪水予報 - 台風情報 - 大雨危険度(土砂災害、浸水、洪水) - 竜巻情報 - 雷情報 - 避難情報 ◆ 有料プラン [ 料金形態 ] - プレミアムプラン:120円/月 - ファミリープラン(6人まで):360円/月 プレミアムプラン初回購入の方は1ヵ月無料でお試しいただけます。無料トライアル期間終了後は月額(¥120)でご利用いただけます。 プレミアムプラン、ファミリープランは自動継続課金機能(Auto Renewable Subscription)を利用しています。 自動更新される際の課金は、有効期限の終了後の24時間以内におこなわれます。 ◆ 有料プランでできること 1. チーム(ファミリープランのみ) 同じ住所にお住いの方でひとつのチームを作ることができます。チームリーダーを含めて6人まで参加可能です。 プランで決めた自分の避難場所や防災用品のリストを、チーム内で共有しましょう。 災害発生時には、自分の安否をチームに知らせることができます。(Googleパーソンファインダーへ連携もできます) 2. 超高速プッシュ通知 有料プランユーザー向けには優先して災害情報をいち早く配信します。 ※端末の通信状況によって通知が届くまで数秒かかることがあります。あらかじめご了承ください。 3. 地震一覧を直近50件まで表示 無料版では直近10件のみ表示される地震一覧が、最大50件まで表示できます。 4. 複数地点設定 有料プランでは設定地点を3箇所登録することができます。 ※通知の優先順位は、現在地、地点A、地点B、地点Cの順になります。 5. 広告非表示 有料プランでは広告が非表示になり、より快適にご利用いただけます。 [ 自動更新の確認・解約方法 ] 自動更新の確認・解約は、設定App > 自分の名前 > サブスクリプションからおこなえます。 *「サブスクリプション」が表示されない場合 設定App > iTunes と App Store > 自分の Apple ID > Apple ID を表示(サインイン) > サブスクリプション 有効期間終了の24時間以上前に「サブスクリプションをキャンセルする」を選択すると自動更新を停止することができます。 自動更新される際の課金は、有効期限の終了後の24時間以内におこなわれます。 [ 利用規約 ] https://www.service.rcsc.co.jp/prep-policy [ プライバシーポリシー ] https://www.rcsc.co.jp/privacy

About

MyShake Earthquake Alerts

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
Currently charting
Read full description

MyShake is a comprehensive and free earthquake app offering these features: Earthquake Early Warnings Receive timely, potentially life-saving early warning alerts in California, Oregon and Washington. MyShake uses the USGS ShakeAlertTM system to deliver alerts for earthquakes of magnitude 4.5 (or greater) several seconds before shaking arrives. Earthquake Safety View safety tips for earthquake preparedness such as securing hazardous or moveable items and creating a disaster plan. Know what to do during an earthquake and learn more about Drop, Cover and Hold On! Earthquake Map and Details View and explore a map of earthquakes around the world and get detailed information such as earthquake magnitude, location and depth. Share your own experience of an earthquake and see community reports of shaking and damage. Earthquake Notifications Stay informed of earthquakes as they occur by receiving notifications on your phone. Select your regions of interest and the earthquake magnitude. You’ll never miss out on any earthquake greater than magnitude 3.5! Smartphone-Based Global Seismic Network Participate in a smartphone-based global seismic network. In this research project, your phone becomes a mini-seismometer and contributes to the detection of earthquakes wherever you are. This global citizen-science based seismic network has the potential to provide early warning earthquake alerts in every region of the world, even in the absence of traditional seismic networks! About Us MyShake is developed by the University of California, Berkeley, Seismology Lab and funded by the California Governor’s Office of Emergency Services. The Berkeley Seismology Lab conducts essential research on earthquakes and solid earth processes while collecting and delivering high quality geophysical data. MyShake is available in English, Spanish (Español), Chinese Traditional (繁體中文), Filipino, Korean (한국인), and Vietnamese (Tiếng Việt). MyShake is available to everyone for free with no ads and no subscription! Learn more at http://myshake.berkeley.edu/

Screenshots

PREP(プレップ)4 screens
MyShake Earthquake Alerts4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

PREP(プレップ) ships an update every 6 weeks, MyShake Earthquake Alerts every 3 months. Both last shipped on September 23, 2026.

Scorecard8 real differences · 3 level
PREP(プレップ) versus MyShake Earthquake Alerts: the parameters behind the verdict, then further details
ParameterPREP(プレップ)MyShake Earthquake Alerts
PriceFreeFree
Rating2.3 (6 ratings)3.3 (1.9K ratings) — better
Positive reviews29.1% of reviews51.6% of reviews — better
Number of ratings61.9K — better
Update frequencyEvery 6 weeks — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank—#49 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size90 MB135 MB
Age rating4+4+
DeveloperRC Solution Co.University of California, Berkeley

Customer experience

PREP(プレップ)

All ratings6 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews189 reviews
Positive29.1%
Neutral10.1%
Negative60.8%

MyShake Earthquake Alerts

All ratings1,913 ratings
Positive52.1%
Neutral9.5%
Negative38.5%
Written reviews223 reviews
Positive51.6%
Neutral9.9%
Negative38.6%

Bugs and requests

PREP(プレップ)

Not enough reviews yet to summarise bugs or requests.

MyShake Earthquake Alerts

Reported bugs

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

Requested features

5 requests
  • 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

In-app purchases

2 purchases

PREP(プレップ)

Subscriptions2
  • PREP Premium Service1 Month trial$0.991 Month
  • PREP ファミリーサービス$3.491 Month
None

MyShake Earthquake Alerts

No in-app purchases

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 23, 2026.

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