Compare them at http://www.wikimatrix.org/compare/Tiki-Wiki-CMS-Groupware+Confluence

• Both are enterprise wikis, along with XWiki, FosWiki, TWiki, etc

• Tiki is Open Source. Confluence is proprietary.
  • If there are things you prefer in Confluence, you can take the money you save and invest it to improve Tiki
• In October 2020, Atlassian made major changes to the licensing model: https://chat.goodbyeserver.org/
• See also: https://wikisuite.org/WikiSuite-vs-Atlassian
• Tiki is PHP, Confluence is Java.

• Confluence
• TikiWiki vs Confluence