Does Supernova support Single sign-on?

Yes. However, this is an Enterprise plan feature. In order for us to set this up, we will need your workspace URL, your verified email domain and your Identity Provider configuration. A full description can be found in our documentation on Single sign-on. 

Once SSO is enabled, it’s possible to enable and disable manual member invitations on a workspace level. It's also possible to enable and disable both SSO-only access to published docs and manual invitations at the same time. Read our documentation on SSO configuration to learn more.