Japan Alerts

Japan Alerts

Earthquake, tsunami & volcano

23 ratings
6 reviews
Free
In-App PurchasesWith Ads

Details

Released
March 14, 2026
Updated
October 30, 2026

Features

Background Location Access

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About

Receive real-time alerts for earthquakes, tsunamis, volcanoes, and typhoons directly from the Japan Meteorological Agency. This app translates critical information into 12 languages, making it essential for residents, travelers, and anyone with loved ones in Japan.

✓Real-time earthquake, tsunami, volcano, and typhoon alerts
✓S-wave countdown for shaking
✓Municipality-level evacuation orders
✓Alerts translated into 12 languages
✓Interactive map with shelters and hazard layers
✓Family safety group and check-in
✓Post-quake analysis
Show original description
+1

What's New in Japan Alerts

3.2

October 30, 2026

• More accurate alerts: you are notified when the intensity JMA measures in the region of your place reaches your threshold. • Intensity at your places: on each quake, the intensity at your most affected place, and all your places on the detail screen. • Fixes and improvements.

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Subscriptions & In-App Purchases

Annual Subscription

Premium features annual subscription

$7.991 Year
1 Year trial
How to cancel Japan Alerts subscription ⁉️

User reviews

My trust is you

I’ll summarize it, with Japan alerts I feel safe

Unreliable

Willing to change my rating on this review but overall this app is very buggy and the only times it works is when there’s no alert considering the amount of users that log into it when an alert is published.

Additionally, we have tried to make a group multiple times and the members of the group are unable to access the group after it have been established. I’ve tried creating another group many times and it simply won’t work.

Please update and fix these bugs
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Response from developer

Thank you for your feedback. We've made updates to address these issues. Previously, when an alert was published, the surge of users pulling live data at once caused the app to slow down or freeze. We've now fixed this: everyone still receives the alert notification right away, but when viewing the detailed information afterward, users using free version are served from a cache to keep the app stable, while Premium members get direct real-time access to latest information. If having the very latest information matters to you, Premium guarantees that even during high-traffic alert moments. We've also fixed the group access bugs from your review. Please give the app another try, and if anything still feels off, please let us know. Japan Alarts team

Deleting app

Glitchy app - stalls out a lot. Worse is that it raises the alarm when nothing is happening. Deleting app.

Response from developer

We're sorry Japan Alerts let you down, and we take the false alarms especially seriously on a safety app. Both problems have been fixed. The alerts firing when nothing was happening came from a server-side issue that could re-trigger earthquakes which had already passed. We found and fixed it, and that fix is already live for everyone, with no update needed. The stalling and glitches were fixed in version 2.0.3, now available. If you're willing to give it another try, we'd love the chance to earn back your trust. Either way, thank you for the honest feedback. Please stay safe. Japan Alerts team

話にならない

実際に地震が来て通知は来たが開こうとしても一切開けない。何度も消して開いてを繰り返してやっと開けても何も表示されない。

Response from developer

この度はご不便をおかけし誠に申し訳ございませんでした。実際の地震の際に通知を開けなかったとのこと、いざという時にお役に立てず心よりお詫び申し上げます。 ご報告いただいた「通知を開いても表示されない/開けない」不具合について調査した結果、地震速報が発表された際に多くのユーザーが同時にリアルタイムの情報にアクセスすることでサーバーに負荷がかかり、アプリが正常に動作しなくなっていたことが原因と判明いたしました。 この問題を解消するため、通知自体は今まで通りすべてのユーザーに即座にお届けいたしますが、詳細情報をご覧いただく際、無料版ではキャッシュ(事前に取得した情報)を表示することでアプリの安定性を確保し、プレミアム会員の方には引き続きリアルタイムの最新情報を直接お届けする仕様といたしました。緊急時により新しい情報をいち早く確認されたい方には、プレミアムプランもご検討いただけますと幸いです。 お手数をおかけしますが最新版にアップデートのうえ改めてお試しいただけますと幸いです。 今後も安心してお使いいただけるよう改善を続けてまいります。 Japan Alerts 開発チーム

Great app for non-Japanese speakers living or traveling in Japan

This app allows to get alerts issued by official agencies in various languages in timely manner. There is also a function that allows to create a group so that you can check if all the members of the group are fine in case of the emergency.
If your family member is going to Japan, or living in Japan, it will be a very useful tool.
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Response from developer

Thanks for your review. Version 2.0 is a way better. Hope you will like it.

Developer apps

FAQ

Does Japan Alerts have ads?

Yes, Japan Alerts contains advertisements. The Premium version offers an ad-free experience.

What is the cost of Japan Alerts Premium?

Japan Alerts offers an Annual Subscription for $7.99, which includes a free trial period.

How often is Japan Alerts updated?

The app was last updated on October 30, 2026, indicating regular maintenance and updates.

What devices support Japan Alerts?

Japan Alerts is available for iPhone and iPod devices.

What is the age rating for Japan Alerts?

Japan Alerts is rated 4+ by age, making it suitable for a wide audience.

Can I track multiple locations with Japan Alerts?

The free version allows basic alerts, while the Premium version lets you watch up to 7 places at once, including custom zones anywhere in Japan.

What kind of alerts does Japan Alerts provide?

Japan Alerts provides real-time alerts for earthquakes (with Shindo intensity and magnitude), tsunamis (with wave height), volcanic eruptions, typhoons, and severe weather, including municipality-level evacuation orders.

How does Japan Alerts compare to official warning systems?

Japan Alerts uses public data from the Japan Meteorological Agency (JMA) but is not affiliated with JMA or the Japanese government. It is not a substitute for official warning systems like J-Alert.