Privacy Policy
TOPDA has no accounts and no sign-up, and no form asks for your name or contact details. Values you type into a calculator or checklist stay in your browser and are never sent to a server.
Cookies and analytics
To see how many people visit and which pages are used, TOPDA uses Google Analytics and Naver Analytics. Both use cookies to record device type, referrer, and pages viewed. IP addresses are anonymised, and figures you enter into a calculator are not transmitted.
Advertising
TOPDA serves ads through Google AdSense to cover running costs. Google and other third-party vendors may use cookies and advertising identifiers to serve ads based on your visits to this and other sites. This privacy policy, the about page, the board, and search-result pages carry no ad script.
How to opt out
- Block or delete cookies in your browser settings. Calculators keep working without them.
- Personalised ads — Google Ad Settings
- Analytics — Google Analytics Opt-out Add-on
- Google's data practices — Advertising and Data policies
Posts you write on the board
Board posts and comments must be visible to other visitors, so they are stored on a server (Supabase). What is stored is the title, body, nickname, timestamp, and a random string that lets you edit or delete your own post later. No IP address or email is collected or stored. Posting privately keeps the body visible only to your browser and the operator. Anything you type is stored as part of that post, so please do not post personal or sensitive information.
Values stored in your browser
Calculator inputs, checklist state, chosen language and board nickname are kept in your browser's localStorage only. They are never transmitted, and clearing site data removes all of them.
Retention and your rights
Posts and comments are kept until you or the operator delete them. Analytics and ad cookies follow each service's policy and cookie expiry. Using these services means access data may be transferred to and processed on servers outside Korea.
Under Korea's Personal Information Protection Act you may request access, correction, deletion, or suspension of processing. To delete a post, use the delete control in the browser you wrote it from, or ask on the board (KO). TOPDA is not directed at children under 14.
Effective 2026-05-31 · Last revised 2026-07-30 · English translation of the Korean privacy policy, which governs in case of discrepancy.