Contact

Questions, feedback, or a bug to report? We read every message.

General & support

Billing questions

For subscription and billing questions, include the email address you used for the purchase. You can also manage your subscription (switch billing or cancel) any time from your account billing portal.

Content corrections

Found a wrong definition or a broken stroke animation? Send us the page URL and a short description — corrections from learners are the main way the dataset improves.