I’ve heard, that draw.io for Confluence Cloud can be free for up to 10 users?
Hi, yes, correct. You can get draw.io for Confluence Cloud free on the Atlassian Marketplace for up to 10 users.
Also, please take a look at this blog article on this subject:
Fore more general info on draw.io for Confluence or Jira, please refer to our draw.io webpage.
And some more great blogposts! Blog - draw.io