Number of users in JIRA doesn't affect the number of users in Confluence. You can have different number of users in both by maintaining different groups.
Check out the online pricing for more details. https://confluence.atlassian.com/adminjiraserver071/installing-jira-applications-802592161.html
If it is Cloud, you just need to purchase it. Nothing to install.
Hey Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
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