Privacy policy

Information collected

When you register for email resources on the site, we collect your email address, consent record, referring page and delivery category. Google Analytics and similar tools may collect usage information such as pages viewed, device information and referrers.

Purposes

• Confirm registrations and deliver the requested resources and related information.
• Handle unsubscribe requests and inquiries.
• Improve articles, calculators and navigation.
• Prevent misuse and operate the site safely.

Advertising and external links

When you click advertising or affiliate links, the advertising provider may receive information needed to record the visit and attribute a purchase or application. Consult the receiving service's terms for its processing practices.

Local calculation data

English comparison worksheets calculate on your device. Where a worksheet saves values, they are stored in the current browser to restore the worksheet. Those values are not submitted by the worksheet to a server.

Email preferences

You can unsubscribe using the instructions in an email. Information no longer needed is removed appropriately, except records that must be retained under applicable requirements.

The Japanese policy was updated October 1, 2026. This English adaptation was prepared 2026-10-10.