Version history
NERV Disaster Prevention
45
ASO score
Text
41/100
Reviews
50/100
Graphic
60/100
Other
0/100
App Rating
4.6
Votes
7.93K
App Age
6y 3m
Last Update
Sep 11, 2025
iAP
$2.49 - 4.49
Compare with Category Top Apps
|
Metrics
|
Current App
|
Category Top Average
|
Difference
|
|---|---|---|---|
|
Rating
|
4.56
|
4.55
|
+0.2%
|
|
Number of Ratings (Voted)
|
7.9K
|
1M
|
-99%
|
|
App Age
|
6y 3m
|
12y 11m
|
-51%
|
|
In-app Purchases Price
|
$3
|
$92
|
-96
%
|
|
Update Frequency
|
64d
|
36d
|
+78%
|
|
Title Length
|
24
|
22
|
+9%
|
|
Subtitle Length
|
24
|
22
|
+9%
|
|
Description Length
|
3 979
|
2 541
|
+57%
|
|
Number of Screenshots
|
1170
|
1538
|
-24
%
|
|
Size
|
68MB
|
119MB
|
-43
%
|
Category Ranking in United States
7 days
Last 7 days
Last 30 days
Last 90 days
Last 180 days
Last year
| Top | Dec 06, 2025 | Dec 13, 2025 |
|---|---|---|
|
|
22
|
| Top | Dec 06, 2025 | Dec 13, 2025 |
|---|---|---|
|
|
22
|
| Top | Dec 06, 2025 | Dec 13, 2025 |
|---|---|---|
|
No results were found!
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||
| Top | Dec 06, 2025 | Dec 13, 2025 |
|---|---|---|
|
No results were found!
|
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Ranking Keywords in United States
| Keywords | App Rank |
|---|
Analyze this and other apps using Asolytics tools
Text ASO
Title
(
Characters:
24
of 30
)
NERV Disaster Prevention
Subtitle
(
Characters:
24
of 30
)
All you need, in one app
Description
(
Characters:
3979
of 4000
)
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}
Read more
Other
Additional Information
Version history
6.2.0
Sep 11, 2025
This update improves the handling of network communication errors and network communication processing.
[Update from the Development Team]
On August 31st, the NERV Disaster Prevention App Development Team participated in the Miyagi Prefecture Comprehensive Disaster Prevention Drill held in Marumori, Miyagi Prefecture. On the day, we also exhibited our disaster response vehicles, and were able to welcome many visitors, including local residents. Despite the sweltering heat and high humidity, some people even travelled over an hour to come and see us! We'd like to express our gratitude to everyone who visited us.
6.1.2
Jul 29, 2025
We've fixed some issues where widgets may not have displayed correctly when using the home screen tint feature in iOS 18. Additionally, an issue where typhoon paths would not display correctly when a typhoon redevelops after having once dissipated has been rectified.
We apologise for the inconvenience caused to our users who experienced widget issues following the previous update.
Please ensure you stay cool, as the recent hot weather continues. Strict vigilance is necessary in order to protect yourself against heatstroke.