NERV Disaster Prevention icon
NERV Disaster Prevention: Comprehensive Emergency Alert System for Japan

by Gehirn Inc.

4.8
IOSWeather
Specialized disaster prevention app delivering real-time earthquake, tsunami, and weather alerts for Japan residents and visitors. Provides location-based emergency warnings with bilingual support and detailed hazard mapping for informed decision-making during crises.

Detailed Review

The NERV Disaster Prevention App represents a specialized emergency notification system developed by Gehirn Inc. specifically for the Japanese market, where natural disasters including earthquakes, tsunamis, and volcanic activity present ongoing risks. This free application serves as a critical tool for both residents and visitors, offering real-time alerts and comprehensive disaster prevention information tailored to users' specific locations. The application's core functionality centers on its ability to deliver immediate earthquake early warnings, tsunami advisories, and volcanic eruption alerts through Japan's official emergency broadcast systems. Beyond seismic events, it provides detailed weather-related disaster prevention information including flood warnings, landslide risks, and severe weather patterns. The system utilizes both current GPS location and pre-registered addresses to ensure relevant alerts reach users regardless of their movement patterns, with customizable notification settings for different threat levels. User experience demonstrates thoughtful design with an intuitive interface that presents complex geological data through clear visualizations and maps. The bilingual implementation (Japanese and English) operates seamlessly, with machine translations maintaining accuracy for critical information. During actual emergencies, such as the Noto Ishikawa earthquake referenced by user hanguolaohu, the app provides real-time shaking intensity maps and evacuation guidance, demonstrating practical utility in high-stress scenarios where quick decision-making is essential. User feedback consistently highlights reliability during actual emergencies, with multiple reviews specifically mentioning the January 2024 Noto earthquake response. Reviewer MayaDAmico (April 2024) notes the completely free nature of the service as exceptional value, while Jack Pellegrini (January 2024) praises the detailed mapping features and clean interface design. The application maintains a 4.8-star rating across thousands of reviews, with particular appreciation for its reliability compared to standard government alert systems. While the app excels within its specialized Japanese context, its utility remains geographically limited to Japan's disaster warning systems. The application represents an exceptional value proposition as a free service, though some users express willingness to pay for subscription features. Its design particularly benefits foreign residents and visitors through comprehensive English support, though primary functionality remains tied to Japan's specific geological monitoring infrastructure and warning protocols.

Key Features

  • Real-time earthquake early warnings with intensity predictions and epicenter mapping for immediate situational awareness
  • Comprehensive tsunami advisory system with evacuation zone mapping and estimated arrival times
  • Bilingual Japanese-English interface with accurate machine translations for critical emergency information
  • Customizable location-based alerts using both GPS positioning and registered address bookmarks
  • Detailed weather disaster prevention including flood forecasts, landslide risks, and precipitation mapping
  • Historical event database with seismic activity records and regional disaster probability statistics

Why Users Love It

Completely free service
Reliable real-time alerts

Perfect for: Residents and visitors in Japan requiring emergency disaster alerts

Screenshots

NERV Disaster Prevention screenshot 1NERV Disaster Prevention screenshot 2NERV Disaster Prevention screenshot 3NERV Disaster Prevention screenshot 4NERV Disaster Prevention screenshot 5NERV Disaster Prevention screenshot 6

User Reviews

Mattmatt729
Sep 4, 2021

Lived my entire in hurricane alley and if I can get a reliable alert app PLUS Nerv action, what’s not to love. Everything I was looking for Lived my entire in hurricane alley and if I can get a reliable alert app PLUS Nerv action, what’s not to love.

FR_GY
Aug 9, 2024

Listen I don’t do reviews, and when I do do with use I’m trying to be petty and disrespectful as possible to the creator who made something horrible that I paid for. You are not the creator. I wanna kiss you for the magnificent work that you have done on this app and how it works 1 million times better than the government official notifications. You deserve piles and piles of love and ice cream for this. I will donate to you to keep you going because this is how you make an app and you’re amazing for it you are so amazing for it I don’t do Reviews Listen I don’t do reviews, and when I do do with use I’m trying to be petty and disrespectful as possible to the creator who made something horrible that I paid for. You are not the creator. I wanna kiss you for the magnificent work that you have done on this app and how it works 1 million times better than the government official notifications. You deserve piles and piles of love and ice cream for this.I will donate to you to keep you going because this is how you make an app and you’re amazing for it you are so amazing for it

MayaDAmico
Apr 12, 2024

A fantastic, completely free app that I think more people should definitely know about when in Japan! Not to mention the EVA theming. Thank you, developers ❤️ A beautifully designed app for weather and earthquake warnings. A fantastic, completely free app that I think more people should definitely know about when in Japan! Not to mention the EVA theming. Thank you, developers ❤️

hanguolaohu
Feb 14, 2024

This app is a must-have for residents of Japan. I like it so much that I would be willing to pay a subscription for it. It’s incredible that it’s offered for free. It has full bilingual support in Japanese and English, and the English machine translations are excellent. When the Noto Ishikawa earthquake occurred, NERV sent me a warning notification in advance with time to arrive at my geolocation with estimated intensity. Godlike capabilities. Those who don’t know this app are left in the dark. Must-Have App for Japan Residents This app is a must-have for residents of Japan. I like it so much that I would be willing to pay a subscription for it. It’s incredible that it’s offered for free. It has full bilingual support in Japanese and English, and the English machine translations are excellent. When the Noto Ishikawa earthquake occurred, NERV sent me a warning notification in advance with time to arrive at my geolocation with estimated intensity. Godlike capabilities. Those who don’t know this app are left in the dark.

Jack Pellegrini
Jan 10, 2024

Am not one to usually write app reviews but from the beautiful design to clean, in-depth features and maps, I am impressed. Shows detailed present and future severe weather events, has great earthquake realtime features, and is an overall smooth app. Fantastic Am not one to usually write app reviews but from the beautiful design to clean, in-depth features and maps, I am impressed. Shows detailed present and future severe weather events, has great earthquake realtime features, and is an overall smooth app.

App Details

Developer

Gehirn Inc.

Platform

ios

Rating

4.8

Last Updated

9/7/2025