We are working on following features right now that are gonna be included in all plans: 1) Split view 2) Public ling sharing, embedded code 3) Kindle highlights sync (syncing the highlighted parts of yout books directly to the app) 4) AI for recommending online content (courses, books etc.) Free plan is just limited by number of documents and storage because we need to cover the server costs for cloud solution.

Right now the solution is cloud based (but with SAML SSO and access provisioning for enterprises). It could be self-hosted it there is a demand for that.