Thanks for using Seesaw! The Seesaw you know and love is still free. We're committed to making sure the core Seesaw service is free for teachers, parents, and students. It is a key part of our mission to positively impact as many students as possible and having Seesaw available for free is one of the ways we achieve that goal.
We also offer Seesaw Plus and Seesaw for Schools, optional paid upgrades for teachers and schools who want to do even more with Seesaw. You can view a comparison of Seesaw, Seesaw Plus and Seesaw for Schools features here: http://web.seesaw.me/pricing