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How can we help you?
A lesson bug, an account problem, a certificate or an idea for a new course. Whatever it is, write to us. We read every message.
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Verify a certificate
Enter a certificate number to see who it was issued to and for which course.
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Where is my guest progress?
Progress without an account is saved in this browser. It moves to your account when you sign up for free.
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Developer API
Docs for the API, “Sign in with CodeBlanks” and webhooks.
Read the docs →
Or write to us