Questions, corrections, accessibility feedback, and partnership enquiries are welcome.
Email us
Please include the page URL, your device/browser, and a short description when reporting a technical problem.What you can contact us about
- Scientific or mathematical corrections
- Broken controls, links, or accessibility barriers
- Privacy and data questions
- Educational use and classroom feedback
- Licensing, attribution, or partnership enquiries
We aim to review messages within five business days. Please do not send passwords, payment-card information, health records, or other sensitive personal information.
Donation support
Donation payments are processed by Stripe. For a payment question, contact us with the date and amount, but never send complete card details.