From the website:
A full suite of applications
CryptPad provides a full-fledged office suite with all the tools necessary for productive collaboration. Applications include: Rich Text, Spreadsheets, Code/Markdown, Kanban, Slides, Whiteboard and Forms. See all apps
End-to-end encrypted
All data on CryptPad is encrypted in the browser. This means no readable data leaves the user’s device. Even the service administrators cannot see the content of documents or user data.
Private Collaboration
CryptPad is built to enable collaboration with features such as team drives, calendar, and sharing. It synchronizes changes to documents in real time. Because all data is encrypted, the service and its administrators have no way of seeing the content being edited and stored.