Privacy policy

AI-translated from the Chinese version. The Chinese version and the official sources prevail.

This site collects as little personal information as possible.

Self-check tool

All calculations in the self-check tool are done in your browser. The information you select, such as your status of residence, the expiry date of your period of stay and your plans, is not sent to any server, and this site does not store it. (Exception: when a logged-in member clicks “Save” themselves — see “Membership” below.)

The ticks in the “Documents to prepare” checklists are saved in your own device’s browser (localStorage) so you can continue next time. They are not sent to any server and are not cookies. Only which documents are ticked is saved — not your status of residence, expiry date or other input. You can delete them at any time with the “Clear ticks” button on the page or by clearing the site data in your browser.

Membership

You can use all of this site’s free content and the self-check tool without logging in, and the explanation above stays the same. Only when you register and log in as a member is the following minimal data stored.

Data stored

• Account: email address (when you log in with Google, the email of your Google account)
• Family members you save yourself: nickname, status of residence, category of the organization, expiry date of the period of stay, plans, prefecture, and the dates of life events (moving, leaving a job, a birth, etc.) entered in the self-check tool, and the passport expiry date and the date you started living in Japan continuously entered on the member page (only the dates are stored, not addresses, company names, passport numbers or other details; no real name is needed)
• Deadlines you add yourself (name, date)
• Application progress you record yourself: member, application type, status after the change, submission date, stage, deadline for the stage, result date, expiry of the period of stay at submission (the receipt number, application contents and documents are not stored)
• Document issue dates you record yourself: member, document type, issue (photo) date (the documents themselves and their contents are not stored)
• Trips abroad you record yourself: member, departure date, return date (destinations and purposes are not stored)
• On-site notifications (deadline reminders, related news) and whether they have been read
• When you turn on push notifications: the push address and encryption keys provided by your browser (no device name or similar information)
• The language used for notifications
• Payment status: Stripe customer ID, plan, end date of the current period

Purpose: used only to show what you have saved, send notifications of deadline reminders (including reminders for application progress) and related news, and manage your subscription. It is not used for advertising and is not provided to third parties (except the service providers below).

Service providers used

• Supabase: stores the data above and handles login (data is stored in the Tokyo region)
• Stripe: handles payments. Card numbers and other payment information are submitted directly to Stripe; this site does not handle or store them
• Google: used only when you choose “Sign in with Google”
• Push notifications are delivered via the push service provided by your browser or operating system (for example Google, Apple, Mozilla)

Login state: the login session is saved in your device’s browser (localStorage); cookies are not used.

Deletion: you can delete members, deadlines and application progress at any time on the member page. “Delete account” on the member page cancels your subscription and deletes your account and all of the data above; this cannot be undone. Payment records such as receipts are kept by Stripe in accordance with its privacy policy.

Analytics

This site currently does not use analytics and does not use cookies. If analytics are introduced in the future, we will choose a tool that does not use cookies or identify individuals, and we will update this page in advance.

Hosting

This site is hosted on Cloudflare Pages. When you visit the site, Cloudflare may record access logs, such as IP addresses, in accordance with its privacy policy.

Contact

For questions about privacy, please contact us via GitHub Issues. Please do not include personal information in an issue.

Updated: 2026-10-28