JIRA server (host yourself) costs USD 10 for up to 10 users, see
As far as I know, it is the same for Confluence. I don't know how you got 5 users for free. Maybe an old pricing structure?
[~mikkel christiansen] That is correct, JIRA licensing is the same as for Confluence - and as far as I know it's been that way for years, UNLESS you work for an organization that is non-profit or a charity. For those organizations, you simply have to qualify for a Community license: https://www.atlassian.com/software/views/community-license-request, and these are self-hosted licenses (not available for Cloud).
JIRA and Confluence Cloud for 10 or less users is USD$10/month (each).
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