Help with a lesson
Tell us the lesson address, the sentence or question number, what you expected and what happened. For audio or display problems, include your browser and device.
Mistakes in a lesson
If an answer, explanation or level looks wrong, send the lesson address and the sentence or question number. Corrected lessons are released as a new version.
Content and rights concerns
Include the lesson address, the material concerned, a link to the original work and how we can reach you. If you act for a rights holder, explain your relationship to them. We review every concern promptly and may remove a lesson while we check it.
Account help
If you forget your password, use Forgot your password? on the sign-in page. If you still cannot sign in, write to us from the email address of your account.
Privacy questions
Ask us about the information described in the Privacy Policy. To delete your account, use Delete account on your account page. To delete your measurement records, use Turn off and remove my events on a lesson page.