Comparisons that start from Wiki.js, the AGPL-3.0 Node.js wiki whose stable 2.x line is maintained while 3.0 remains in beta.
Wiki.js against Outline for an internal knowledge base: AGPL versus Business Source License, Git-backed storage versus PostgreSQL and Redis, built-in authentication modules versus Outline's SSO-only login and licensed SAML, and Wiki.js 3.0 still in beta.
A database-backed Node.js wiki against a flat-file PHP wiki: storage and backup model, authentication modules, editing experience, hosting requirements and which suits air-gapped or very small installations.
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