Privacy Policy

Last updated: September 22, 2026

1. Purposes of collecting and using personal information

This website provides calculator and game services and collects personal information for the following purposes:

  • Providing and operating the service
  • Providing advertising services (Google AdSense)
  • Improving the user experience
  • Statistical analysis

2. Personal information collected

Information collected automatically:

  • IP address
  • Browser information
  • Operating-system information
  • Visit history
  • Cookie information

3. Google AdSense and cookies

This website displays advertising through Google AdSense. Google may use cookies to provide personalized advertising.

  • Providing Google advertising and content
  • Displaying interest-based advertising
  • Measuring advertising effectiveness

Google Privacy Policy: https://policies.google.com/privacy

4. Retention and use period

Collected personal information is destroyed without delay after the purpose of collection has been fulfilled, except when retention is required by applicable law, in which case it is retained for the required period.

5. Provision to third parties

As a rule, the company does not provide users’ personal information to outside parties. Exceptions may apply in the following cases:

  • The user has agreed in advance
  • Disclosure is required by law or requested by an investigative authority according to procedures and methods prescribed by law

6. Withdrawing advertising consent

Users may opt out of personalized advertising at any time:

  • Decline through browser cookie settings

Google Ads Settings: https://adssettings.google.com

7. Contact

For questions about personal-information handling, contact:

8. Current service storage and transmission scope

  • Calculation inputs and results are not retained on the server. Some calculators may send values needed for processing to an API.
  • My Tools stores only canonical tool keys, favorite order, and recent-use timestamps in this browser’s localStorage and does not send that data to a server API. There is no server account or cloud sync.
  • Theme, selected language, some criteria caches, and game high scores may also be stored in browser storage to support site features.
  • If a user chooses to submit a game ranking, the game type, nickname, and score are sent to and stored on the server for display on the ranking board.
  • To reduce duplicate visitor counts, a random browser identifier may be stored in localStorage and sent to the visitor-count API. The server may store that identifier with the visit date and the first visited path for that day; the original IP address is not stored with the visitor record. Session counts are aggregate anonymous session-start events based on sessionStorage, while page views are stored only as daily aggregates by public pathname, language, and device class without a user identifier.
  • Google Analytics and Google AdSense may use cookies or similar technology for visit and advertising measurement.
  • When the ad-block notice is dismissed, localStorage stores an expiry timestamp used to delay showing it again.
  • The contact form’s name, email, subject, and message are passed to the user’s email app and are not submitted to this site’s server.
  • Reset My Tools deletes My Tools data and any calculationHistory left by the previous My Page.