Quip — which is now owned by Salesforce — may not be privacy focused, but it does tout better collaboration features than Google Docs, especially in the workplace.
Bret Taylor, a former top Facebook exec and the co-founder of Quip Bret Taylor once said on Quora that the company is just as much about “communication as it is about documents.” The goal isn’t to create a doc and email it off to a colleague. Full collaboration within the document is the idea behind Quip.
For a team of five, Quip costs $30 per month and $12 for each additional person.
Another document app to consider is Notion. It, too, is focused on collaboration.