Using the free version of Seesaw, you can have up to 10 classes at a time.
We just released a new premium service called Seesaw Plus. Among other great new features, Seesaw Plus users can have up to 25 active classes at a time! Here’s more information about Seesaw Plus: http://web.seesaw.me/seesaw-plus
If you’d like to use Seesaw in more than 25 classes at a time, please consider our Seesaw for Schools service. Using Seesaw for Schools, teachers can have up to 100 classes at a time. http://web.seesaw.me/seesaw-for-schools/