Kigana Free and Kigana Premium are the two feature plans available.
Kigana Free can be used without providing any payment information and is limited to 10 students and 1GB of data storage (used for blog post attachments). It is meant for testing out Kigana for free and can be used for small centers.
Kigana Premium is the unlimited plan. It is meant for medium-to-large centers and includes Premium Support.