Is there a limit on the number of participants or classes I can have?

Participants: 

Each class can have an unlimited number of participants!

Classes: 

You can create up to 100 class groups per account. If you need more classes, you can create another account with a different email address.

Just click the "Create a class" below "Classes owned" to create new classes.

If you don't see this button, you've reached the limit.