When the SaaS clean-up reaches the wiki, the shortlist almost always ends with the same two names: Outline and Docmost. Both cover what teams use Notion or Confluence for — documentation, knowledge base, shared writing — and both run on your own infrastructure. The short version of the decision: Outline is the more mature product with the nicer editor and the bigger operational prerequisites; Docmost is younger and more frugal — and licence-wise the cleaner open-source choice.
Two tools, two characters
Outline has been around for years, and the product shows it: a fast, tidy Markdown editor, nested collections, strong search, clean integrations. It’s the wiki where Notion switchers miss the least. There are two quirks you need to know about. First, login: Outline ships no user management of its own and requires an external identity provider — OIDC, meaning something like Keycloak or Authentik. Second, the licence: Outline is under the Business Source License; the code is viewable and self-hosting is allowed, but it isn’t OSI open source.
Docmost is the younger challenger and deliberately keeps things simpler: built-in user accounts, Postgres plus Redis, done. The editor collaborates in real time, content organises into spaces, comments and permissions are on board. The community edition is AGPL-licensed — genuine open source. In exchange, the product is visibly younger: smaller community, shorter integration list — and occasionally a comfort detail is missing that Outline has had for years.
| Outline | Docmost | |
|---|---|---|
| Maturity | years in production | younger, moving fast |
| Editor | Markdown, very polished | real-time collaboration, solid |
| Login | external only (OIDC/SSO) | built in, SSO possible |
| Infrastructure | Postgres, Redis, S3 storage | Postgres, Redis |
| Licence | Business Source License | AGPL (community) |
| Import | Notion/Confluence exports | Notion/Confluence exports |
What about XWiki, BookStack and Wiki.js?
They exist, and two of them are the better choice for specific cases — just not for the Notion feel this comparison is about.
XWiki is the Confluence class among open-source wikis: Java, LGPL-licensed, structured data, macros, fine-grained permissions, plus a proper Confluence migration path. If you genuinely need that complexity — forms inside the wiki, small custom applications, permissions down to the paragraph — nothing else delivers it at this depth. For a normal company wiki it’s too much machine, and the Java instance wants noticeably more resources than anything else in this comparison.
BookStack goes the opposite way: PHP, MIT licence, built-in accounts, and the structure is fixed — shelves, books, chapters, pages. That sounds like a limitation and is exactly the strength: for handbooks, IT documentation and anything meant to stay ordered, BookStack is often the sanest, lowest-maintenance choice. Freely nested workspaces like Notion’s are not on offer.
Wiki.js looks good and supports plenty of login methods, but the honest situation is: version 2 is frozen and only receives maintenance, and version 3 has been announced for years with no release date. Hard to recommend for a fresh start today — nobody wants to migrate a wiki twice.
Which is why the shortlist for a Notion replacement stays Outline and Docmost. XWiki and BookStack aren’t worse tools; they answer different questions.
The login question decides more often than the editor
Inconspicuous as it sounds, the external-identity-provider requirement sorts most projects. If you already run an open-source stack with central login — Keycloak or Authentik are usually there anyway — Outline gives you the more mature wiki at practically no extra cost, and single sign-on across all tools is the better state regardless. If you want just a wiki and nothing else, Outline means starting two services at once — then Docmost is the saner start, and the central login can still come later.
Operations and migration, planned realistically
Both systems are ordinary container applications — built for self-hosting, not bent into shape for it afterward — and thus operations-friendly: database backups (for Outline also the S3 storage), updates, monitoring, the usual diligence that wiki projects actually fail on. When importing from Notion or Confluence, text and structure come across well in practice; manual work remains for database views, macros and permissions. A weekend per knowledge base is an honest planning figure — and far cheaper than another year of subscription. If you’d rather not carry instance, login and migration yourself, the package is available as managed operations.
Want to pull your company knowledge out of the subscription and need the right wiki base? Get in touch — after a short look at your stack, the Outline-or-Docmost question is usually settled within an hour.