Comparison

NERV Disaster Prevention vs SACHET

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

Head to head
About

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.

Highlights
  • 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
Features
Currently charting
Read 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

About

SACHET

Receive real-time, geo-targeted disaster alerts and weather forecasts from official government sources. Access vital resources like helpline numbers and safety guidelines in multiple Indian languages.

Highlights
  • Real-time geo-targeted disaster alerts
  • Weather reports and forecasts
  • Official government warnings
  • Helpline numbers and resources
  • Multi-language support with read-out
  • Satellite receiver connectivity
Features
Read full description

SACHET, is a disaster early warning platform envisioned by the National Disaster Management Authority (NDMA) to provide real-time geo-targeted alerts to citizens. Users can receive alerts for their current location or subscribe any state / district in India to receive alert notifications. The SACHET mobile app provides warning from authorized Government sources and authorities to warn the public of a possible disaster situation. Furthermore, the app provides weather report and forecast from Indian Meteorological Department (IMD) for day to day weather updates. The app also provides various useful resources such as Dos & Don’ts, helpline numbers, alert effected area and satellite receiver connectivity feature. The app can be used in 12 Indian languages with translation and read out facility.

Screenshots

NERV Disaster Prevention4 screens
SACHET4 screens

Verdict

The call

The clearest difference is rating: NERV Disaster Prevention at 4.7 against SACHET's 1.0. NERV Disaster Prevention also leads on review sentiment (80% vs 56%) and ratings volume (47 vs 1). SACHET's advantage is in-app purchases (none vs 2) and update cadence (every 10 days vs every 6 weeks). On price, ads and device support 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. NERV Disaster Prevention sells 2 in-app purchases, starting at $2.49 per month. SACHET asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

NERV Disaster Prevention holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: NERV Disaster Prevention has 47 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 80% of NERV Disaster Prevention's written reviews are positive against 56% of SACHET's.

UpkeepUpdate frequency

NERV Disaster Prevention ships an update every 6 weeks, SACHET every 10 days. Both last shipped on November 3, 2026.

Scorecard8 real differences · 3 level
NERV Disaster Prevention versus SACHET: the parameters behind the verdict, then further details
ParameterNERV Disaster PreventionSACHET
PriceFreeFree
Rating4.7 (47 ratings) — better1.0 (1 ratings)
Positive reviews80.5% of reviews — better56.0% of reviews
Number of ratings47 — better1
Update frequencyEvery 6 weeksEvery 10 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
Best chart rank#75 — better—
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.113.0 — better
Further details — not scored
Size76 MB38 MB
Age rating4+4+
DeveloperGehirn Inc.CDOT

Customer experience

NERV Disaster Prevention

All ratings47 ratings
Positive91.5%
Neutral2.1%
Negative6.4%
Written reviews82 reviews
Positive80.5%
Neutral4.9%
Negative14.6%

SACHET

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews25 reviews
Positive56.0%
Neutral28.0%
Negative16.0%

In-app purchases

2 purchases

NERV Disaster Prevention

Subscriptions2
  • E Plan$2.491 Month
  • EE Plan$4.491 Month
None

SACHET

No in-app purchases

Questions

Is NERV Disaster Prevention free?
NERV Disaster Prevention is free to download, with in-app purchases available.
Is SACHET free?
SACHET is free to download, with no in-app purchases.
Which has better reviews, NERV Disaster Prevention or SACHET?
NERV Disaster Prevention is rated higher. NERV Disaster Prevention averages 4.7 out of 5 from 47 ratings, while SACHET averages 1.0 from 1 ratings.
Do NERV Disaster Prevention or SACHET have ads?
Neither NERV Disaster Prevention nor SACHET shows ads.
Which is updated more often, NERV Disaster Prevention or SACHET?
NERV Disaster Prevention ships an update every 6 weeks, and SACHET every 10 days. Most recently, NERV Disaster Prevention was updated on November 3, 2026 and SACHET on November 3, 2026.

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