Questions, feedback, or trouble with your account — send a note and it'll come straight to me.
A lot of common questions are already answered on the FAQ — free limits, how "unpack further" works, what happens when you get a comprehension check wrong. The How to Use page covers guardians, students, and assigned work.
If it's not covered there, use the form below. Include your account email if your question is about a specific curriculum or your limits.