Privacy Policy

Last updated: May 21, 2026

1. Overview

Radii is committed to protecting your privacy. This policy explains what information we collect, how we use it, and your rights regarding your data. We believe in keeping things simple — we collect very little and we don't sell anything.

2. Information We Collect

Radii collects minimal data:

  • Analytics: We use privacy-friendly analytics (Plausible) that does not use cookies or track individuals. Data is aggregated and includes page views and referral sources only.
  • Local storage: The Workspace feature saves your bookmarked terms locally in your browser. This data never leaves your device.
  • No accounts: Radii does not require registration. We do not collect names, email addresses, or passwords.

3. Cookies

Radii does not use tracking cookies. Plausible Analytics operates without cookies. If you use features that save state (such as the Workspace), your browser's local storage is used — not cookies.

4. Third-Party Services

We may use third-party services to deliver the site (hosting infrastructure, CDN). These providers have their own privacy policies. We do not share personal data with advertisers or data brokers.

When the AI Prompt Builder feature launches (Stage 8), queries sent to generate prompts will be processed via the Anthropic API. Those interactions will be subject to Anthropic's Privacy Policy. We will update this section when that feature launches.

5. Your Rights

Since we don't collect personal data, there is typically nothing to request deletion of. If you believe data about you has been collected inadvertently, please contact us and we will investigate and respond promptly.

6. Children's Privacy

Radii is a general-purpose educational resource. We do not knowingly collect data from children under the age of 13. If you believe a child has submitted personal information, please contact us immediately.

7. Changes to This Policy

We may update this Privacy Policy from time to time. We will update the “Last updated” date at the top of this page when changes are made. Continued use of Radii after changes are posted constitutes acceptance of the updated policy.

8. Contact

Privacy questions or concerns? Reach us via our About page.