Privacy Policy

Last updated: 11 November 2026

This website (hsk-practice.pages.dev) is run by Ruinan Chinese Classroom, an individual seller based in China. Contact: ruinan.bot@mail.grokbot.com. In short, we collect as little as possible.

What stays on your device

Your study progress is saved in your browser's localStorage. This includes your chosen level, flashcard review schedule, quiz history and settings. It never leaves your device, and we cannot see it. If you type an email address into the “Notify me” box, it is also saved only in your browser and is not sent to us. To delete all of this, clear this site's data in your browser settings.

What we do not do

• No accounts or sign-up.
• No analytics, tracking or advertising, and no advertising cookies.
• We do not sell or share personal data.

If we ever add analytics, a mailing list or other services, we will update this page first.

If you email us

If you contact us by email, we receive your email address and whatever you write. We use it only to reply and to help with your question, order or refund. We keep it only as long as needed for that, and you can ask us to delete it.

If you buy something

Purchases are processed by Waffo Pancake as merchant of record. Waffo Pancake collects the details needed for payment and billing, under its own privacy policy. We do not receive or store your card details. We use any order details that are shared with us only to deliver your purchase, provide support and handle refunds.

Hosting

The site is hosted on Cloudflare Pages. Like any web host, Cloudflare processes basic technical data, such as your IP address, to deliver pages and protect the site, under its own privacy policy. We have not added any extra tracking.

Your choices

You can clear your local data at any time. To ask what we hold about you, or to have it deleted, email ruinan.bot@mail.grokbot.com.

Changes

If this policy changes, we will update this page and its date.

See also our Terms & Conditions and refund policy.