🐟 Jishin Sensei — Press Kit

Japan Earthquake Safety Quiz · iPhone and iPad · free · English, 日本語, 한국어, 简体中文, 繁體中文

A daily earthquake-safety quiz for people visiting or living in Japan, with show-and-point emergency cards and an offline guide. Made by a solo developer in Japan.

Open on the App Store Download press kit (ZIP) QR code linking to the App Store page

One-line description

EN One question a day on earthquake safety in Japan, with show-and-point emergency cards and an offline guide. Five languages, all free.
JA 「地震のとき、どうする？」を1日1問で。見せて伝えるカードと、圏外でも開ける緊急時ガイドも。5言語対応、すべて無料。
KO 하루 한 문제로 익히는 일본 지진 안전. 보여주며 전하는 카드와 오프라인 긴급 가이드까지. 5개 언어, 전부 무료.
ZH-Hans 每天一题，学会在日本遇到地震时该怎么做。附指给对方看的会话卡和离线紧急指南。5 种语言，全部免费。
ZH-Hant 每天一題，學會在日本遇到地震時該怎麼做。附指給對方看的會話卡和離線緊急指南。5 種語言，全部免費。

Boilerplate

Jishin Sensei ("Earthquake Teacher") is a free iPhone and iPad app that teaches earthquake safety in Japan one question a day. Namazu Sensei — the catfish of Japanese earthquake folklore — asks a real-life scenario each day and explains the answer, with a photo or chart where one helps and a link to the official source. For the moment you need to communicate, the Prepare tab holds 31 communication cards that write the Japanese for you and let the other person answer on a board, plus a trip card, a health card and a sign dictionary; the Emergency tab works fully offline. The app runs in English, Japanese, Korean, and Simplified and Traditional Chinese, and every part of it is free. It is made by Makoto Katano, a solo developer in Japan.

Facts

PlatformiPhone and iPad — App Store

PriceFree. Optional tips for the sensei (USD 1.99 / 4.99 / 9.99) unlock nothing

LaunchedAugust 18, 2026 (1.0). Version 1.0.6 made everything free; 1.0.7 (September 12, 2026) rebuilt the cards with answer boards and added the trip card; 1.0.10 (September 25, 2026) added iPad

DeveloperMakoto Katano, solo developer, Japan

Content68 scenario questions in 5 categories, one per day; 58 carry a photo or chart. Explanations cite official sources: JMA, JNTO, Tokyo Metropolitan Government and others

LanguagesEnglish, Japanese, Korean, Simplified Chinese, Traditional Chinese

Prepare tab31 communication cards that write the Japanese for you (read aloud, answer boards, a pad to write on; 27 cards for helping a visitor in the Japanese UI), trip card, health card (iOS Keychain), sign dictionary of 39 words (paste photo text to search), Destinations for 9 areas

Emergency tabWorks fully offline: what to do, by place, 110 / 119 / 118, 171, Japan Visitor Hotline

PrivacyNo accounts, no ads, no analytics or ad SDKs, no server of my own. Nothing you type is sent anywhere; Expo (content updates) and RevenueCat (tips) receive limited technical data (see the privacy policy)

Built forRevenueCat Shipaton 2026

Jishin Sensei is not affiliated with any government body. Japan's official alert app is "Safety tips" (Japan Tourism Agency), which the app recommends installing.

Video

5:30 A tour of the app — every tab, the cards and the answer boards, airplane mode. English captions, no narration.
1:58 Short demo — the same tour in under two minutes.
5:35 For hotels in Japan — in Japanese, for front-desk staff: the cards on a staff iPhone, read aloud in the guest's language, and the poster. Japanese captions, no narration.

All three are public on YouTube and free to embed in coverage.

Screenshots

App Store screenshots, 1.0.7. English set of eight; the first screen in each of the other four languages. The ZIP has all eight in every language, full size (1320×2868).

Today: one earthquake question a day — 1 · Today

Answer explained with an official source — 2 · Answer and source

Emergency tab, works offline — 3 · Emergency

Destinations: pick a city for its app and tsunami risk — 4 · Destinations

Communication card: tap what happened, get the Japanese line — 5 · Communication card

Health card: allergies and blood type in Japanese — 6 · Health card

Sign dictionary: paste the sign, get the meaning — 7 · Sign dictionary

Refund or change? The card follows — 8 · Rephrase

Artwork

Namazu Sensei, happy — Namazu Sensei (happy) · 1024 px in ZIP

App icon · 1024 px in ZIP

Artwork and screenshots may be used in coverage of the app. Please do not alter the sensei.

Poster (A4, five languages)

"What do you do when the ground shakes?" with a QR code to the App Store. Free to print and display — schools, hostels, information desks, community lounges. 300 dpi PNG, A4 portrait. All five are also in the ZIP.

Download: English · 日本語 · 한국어 · 简体中文 · 繁體中文

宿泊施設の方へ（For hotels and other accommodation）: フロントや客室に置く場合は、こちらの版をお使いください。デザインは同じで、QR コードに宿泊施設経由のダウンロード数を数えるための印（個人を特定しない集計用）が入っています。ダウンロード: 日本語 · English · 한국어 · 简体中文 · 繁體中文。宿泊施設向けの紹介動画（日本語・5:35）もご覧いただけます。

Why a catfish, and why free

In Japanese folklore a giant catfish (namazu) living beneath the earth was said to cause earthquakes; after the great Edo earthquake of 1855, hundreds of namazu-e prints turned the catfish into a popular character. Jishin Sensei makes him the teacher: each day he asks what you would do, then shows the official answer.

Everything in the app is free so that nothing anyone might need in an emergency sits behind a purchase. People who want to say thanks can leave a tip for the sensei in Settings; it unlocks nothing.

Contact

Press: sukunabicco@gmail.com — Makoto Katano. Screenshots in other languages, review notes or a short interview are one reply away.

Hotels, feedback and everything else: the contact form (English or Japanese). Bug reports: GitHub Issues.