Privacy policy
Last updated:
Information we collect
This site does not collect information that identifies you, such as your name, email address, or phone number. There is no sign-up or login.
Information saved in your browser
Your learning progress (finished lessons, where you left off, basic check results) and your chosen language are saved in your browser (localStorage).
This information is not sent to our servers. The operator cannot see it.
How to delete saved information
You can delete your progress with 「Delete my progress」 on the Settings page. To delete everything, including your display language, delete this site's data (cookies and site data) in your browser settings.
Analytics and advertising
We do not use analytics tools or advertising.
Service that delivers this site
This site is delivered through an external hosting service. To operate safely, the service may temporarily keep access logs (IP address, time, browser type, and so on).
Changes to this policy
We will announce any changes on this page. When we add a login feature, we will add what information we keep and how we use it.
Operated by
If you have any questions about this privacy policy, please contact us below.