PREP(プレップ) vs NERV Disaster Prevention
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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 descriptionHide 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
NERV Disaster Prevention
This app provides critical disaster warnings for earthquakes, tsunamis, volcanic eruptions, and weather-related events like floods and landslides. It offers real-time information optimized for your current and registered locations, helping you make informed decisions during emergencies.
- Earthquake, tsunami, volcanic eruption warnings
- Weather-related disaster prevention info
- Location-optimized alerts
- Real-time map interaction
- Urgency-based notification sorting
- Critical Alerts for imminent danger
- Barrier-free design
Read full descriptionHide full description
The NERV Disaster Prevention App is a smartphone service that delivers earthquake, tsunami, volcanic eruption and emergency warnings, as well as provides weather-related disaster prevention information for flooding and landslides, optimised based on the user's current and registered locations. The app was developed to help people living in or visiting an area where damage is expected to occur, to accurately assess the situation and make quick decisions and actions. With information received directly through a leased line connected to the Japan Meteorological Agency, our proprietary technology enables the fastest information distribution in Japan. ▼ All the information you need, in one app Get a wide range of disaster prevention information, including weather and typhoon forecasts, rain radar, earthquake, tsunami and volcanic eruption alerts, emergency weather warnings and landslide information, river information, and heavy rain risk notifications. By interacting with the map on the screen, you can zoom in on your location or pan across the country and see the cloud cover, typhoon forecast areas, tsunami warning areas, or the scale and intensity of an earthquake. ① Providing users with the most appropriate disaster information The home screen displays the information you need at the time and place you need it. When there’s an earthquake, the home screen will show you the latest information. If another type of warning or alert is issued while the earthquake is active, the app will sort them depending on the type, elapsed time and urgency, so you’ll always have the most important information at your fingertips. ② Push Notifications for Important Information We send out different types of notifications depending on the device’s location, the type of information and level of urgency. If the information is not urgent, we send a silent notification as not to disturb the user. For more urgent situations where a disaster is time-sensitive, a ‘Critical Alert’ alerts the user to an imminent danger. Notifications like Earthquake Early Warnings (Alert level) and Tsunami Warnings will be forced to sound, even if the device is in Silent or Do Not Disturb modes. Note: Critical Alerts will only be sent to users in the target area of the most urgent types of disasters. Users who have registered their location but are not in the target area will instead receive a normal notification. ※ In order to receive Critical Alerts, you need to set your location permissions to “Always Allow” and have Background App Refresh turned on. If you don’t want Critical Alerts, you can disable them from Settings. ③ Barrier-Free Design We paid close attention when designing the app to ensure our information is accessible to everyone. We put a focus on accessibility, with colour schemes that are easy to distinguish for people with colour blindness, and use a font with large, clear letters so long bodies of text are easy to read. ▼ Supporters’ Club (In-App Purchase) In order to keep doing what we do, we’re looking for supporters to help us cover the development and operational costs of the app. The Supporters’ Club is a voluntary membership scheme for those who want to give back to the NERV Disaster Prevention app, by contributing to its development with a monthly fee. You can find out more information about the Supporters’ Club on our website. https://nerv.app/en/supporters.html [Privacy] Gehirn Inc. is an information security company. The security and privacy of our users is our highest priority. We take great care not to collect excessive amounts of information about our users through this application. Your exact location is never known to us; all location information is first converted to an area code used by everyone in that area (like a zip code). The server also doesn’t store past area codes, so your movements cannot be tracked. Learn more about your privacy on our website. https://nerv.app/en/support.html#privacy
Screenshots
Verdict
The clearest difference is review sentiment: NERV Disaster Prevention at 81% against PREP(プレップ)'s 29%. NERV Disaster Prevention also leads on rating (4.7 vs 2.3) and ads (none vs shown). On price, update cadence, in-app purchases and monetization model 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
Both are free to download. PREP(プレップ) sells 2 in-app purchases, starting at $0.99 per month and NERV Disaster Prevention sells 2 in-app purchases, starting at $2.49 per month. Whichever you choose, the download price is not the number that matters.
NERV Disaster Prevention holds the better App Store score, 4.7 against 2.3. That said, the two scores are not equally well evidenced: NERV Disaster Prevention has 47 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 81% of NERV Disaster Prevention's.
Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on September 23, 2026 and September 25, 2026 respectively.
| Parameter | PREP(プレップ) | NERV Disaster Prevention |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (6 ratings) | 4.7 (47 ratings) — better |
| Positive reviews | 29.1% of reviews | 81.1% of reviews — better |
| Number of ratings | 6 | 47 — better |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | #94 — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 90 MB | 76 MB |
| Age rating | 4+ | 4+ |
| Developer | RC Solution Co. | Gehirn Inc. |
Customer experience
PREP(プレップ)
NERV Disaster Prevention
In-app purchases
PREP(プレップ)
- PREP Premium Service1 Month trial$0.991 Month
- PREP ファミリーサービス$3.491 Month
NERV Disaster Prevention
- E Plan$2.491 Month
- EE Plan$4.491 Month
Questions
Is PREP(プレップ) free?
Is NERV Disaster Prevention free?
Which has better reviews, PREP(プレップ) or NERV Disaster Prevention?
Do PREP(プレップ) or NERV Disaster Prevention have ads?
Which is updated more often, PREP(プレップ) or NERV Disaster Prevention?
Other comparisons















