Outline
FreemiumOpen-source wiki and knowledge base for teams
About Outline
Outline is an open-source wiki and knowledge base built with Node.js and React, positioned as a self-hosted alternative to Confluence or Notion's team wiki. Around 26K GitHub stars. It supports real-time collaborative editing, a clean markdown-based editor, nested document structure, and full-text search. PostgreSQL is the primary database; Redis is required for caching and real-time features; S3-compatible storage (MinIO, AWS S3) handles images and file attachments. Docker Compose setup works but is more involved than simpler tools — you're configuring three or four services before anything runs. Authentication supports Google, Slack, OIDC, and SAML. The editor UX is closer to Notion than Confluence and is the cleanest of the self-hosted wiki options. Reddit users call it the best-looking self-hosted wiki but consistently note the Redis and S3 dependency overhead. Import from Confluence and Notion works reasonably well. Compared to BookStack (simpler, MySQL-only) and Wiki.js (more setup options), Outline has the best editor but the most infrastructure requirements.
Key Features
Pricing Plans
Self-Hosted
- Free forever
- Full features
- Your own server
Cloud Starter
- Up to 10 users
- Unlimited docs
- Slack integration
Cloud Business
- Unlimited users
- SSO/SAML
- Priority support
Pros
- Beautiful fast editor
- Easy self-hosting with Docker
- Great Slack integration
- Open source and transparent
- Nested document structure
- Active development community
Cons
- Fewer templates than Notion
- No databases or spreadsheets
- Requires SSO provider for self-hosted
- Limited offline support
- Smaller plugin ecosystem
- No mobile app
Best For
- Teams wanting the best-looking self-hosted wiki
- Organizations with Confluence fatigue and existing S3 storage
- Teams needing SSO via Google, Slack, or SAML
- Engineering-led companies that want a Notion-like wiki they control
Not Ideal For
- Teams wanting a simple single-container wiki setup
- Small teams without existing S3-compatible storage infrastructure
Potential Deal Breakers
- Requires Redis, PostgreSQL, and S3-compatible storage — three services before you start
- Self-hosted setup is more complex than BookStack or Wiki.js
- Cloud-hosted pricing is $9/user/mo, not cheap for larger teams
Data & Privacy
Open-source wiki. Self-hosted keeps all documents on your server. Cloud version hosted by Outline. No AI training. Real-time collaboration with data staying on your infrastructure.
Who Is This For?
Hands-on tested May 2026
Signup Experience
Self-hosted requires Docker Compose with PostgreSQL, Redis, and S3-compatible storage -- three services before the wiki is usable. A Slack or Google OAuth app also needs registering for authentication. Expect 45 to 90 minutes for a clean VPS setup. Cloud signup via email is instant with a 7-day trial.
For Home Users
Free self-hosted Outline is a genuinely excellent personal wiki. The editor is the cleanest of any self-hosted option -- fast, Notion-like, and comfortable to write in daily. The Redis and S3 requirement is overhead for solo use; BookStack or Obsidian are simpler for personal note-taking without those dependencies.
For Business Users
Cloud at $10/user/mo is competitive with Confluence and better than Notion for pure documentation. The Slack integration is first-class -- searches, shares, and unfurls work without friction. SSO via Google, Slack, OIDC, or SAML covers most enterprise auth requirements. Teams already running Postgres, Redis, and S3 infrastructure get the self-hosted path essentially for free.
Our Verdict
Outline has the best editor UX in the self-hosted wiki space and the real-time collaboration works well. The Redis + Postgres + S3 setup is more infrastructure than most teams want for a wiki. If you have those services already, it's excellent. If not, BookStack is simpler.