Docmost vs Outline vs AFFiNE (2026)

Choosing the Right Open Source Knowledge Base

Confluence costs $5.16-$10.50/user/month. Notion is $10-18/user/month. GitBook charges $6.70+/user/month for team plans. For a 20-person team, these costs add up to $1,200-4,320/year for what is fundamentally a documentation tool.

Three open source alternatives stand out in 2026: Docmost for simple team wikis, Outline for production-ready knowledge management, and AFFiNE for teams that need both documents and whiteboards.

Each serves a different use case. This comparison helps you choose.

TL;DR

• Outline (29K+ stars): Best production-ready knowledge base for teams. Mature, stable, great auth integration. Best for growing teams who need reliability now.
• Docmost (8K+ stars): Best lightweight wiki for small teams. Dead simple to deploy, zero learning curve. Best when you just need a team wiki.
• AFFiNE (62K+ stars): Best when you need whiteboard + docs together. Unique canvas/page hybrid. Best for design and product teams.

Quick Comparison

Feature	Outline	Docmost	AFFiNE
GitHub Stars	29K+	8K+	62K+
Deployment complexity	Low	Low	Medium
Documents	Yes	Yes	Yes
Databases/tables	No	No	Limited
Whiteboard	No	No	Yes
Inline comments	Yes	Yes	No
Auth integrations	Excellent	Good	Basic
Team management	Yes	Yes	Yes
Real-time collab	Yes	Yes	Yes
Search	Excellent	Good	Basic
API	Comprehensive	Growing	Limited
License	BSL 1.1	AGPL-3.0	MIT

Outline — Most Production-Ready Choice

Outline (29K+ GitHub stars) is the most mature and production-ready open source knowledge base. It's not trying to replicate Notion's databases or AFFiNE's whiteboards — it's a focused, polished team knowledge base that works reliably at scale.

What Makes It Stand Out

Authentication: Outline's auth system is its standout feature. It supports Google Workspace, Slack, Azure AD, GitHub, Okta, and any OIDC-compatible provider. For teams already using one of these, login is seamless. This is more mature than most alternatives.

Clean editor: Markdown-based editor with slash commands, code blocks, tables, images, and embeds. Fast, reliable, and consistent — no surprises.

Collections: Organize documents in hierarchical collections (like Confluence spaces). Share collections with specific teams, set permissions per collection, and manage access centrally.

Version history: Every document edit is tracked. View the history of any document, see who changed what, and restore previous versions.

API: Comprehensive REST API covering documents, collections, users, and groups. Excellent for integrations, data export, and automation.

Search: Fast full-text search across all documents. Works well even on large knowledge bases.

Templates: Create and share document templates for meeting notes, project proposals, specs, etc.

Self-Hosting Requirements

services:
  outline:
    image: outlinewiki/outline
    env_file: ./docker.env
    ports:
      - "3000:3000"
  storage:
    image: minio/minio
  redis:
    image: redis
  postgres:
    image: postgres:16

Three core services: the Outline app, PostgreSQL (database), and Redis (caching). Optional MinIO for local file storage instead of S3.

Auth requirement: Outline requires an external auth provider — it has no built-in username/password system. You need Google, Slack, Azure AD, or another OIDC provider configured. For teams without an existing provider, this is the main barrier.

License note: Outline uses BSL 1.1 (Business Source License), not a traditional open source license. Converts to Apache 2.0 after 3 years. Production use restrictions may apply — read the license for your use case.

Best for: Teams with 10-200+ people who need a stable, well-maintained knowledge base and already have an OIDC auth provider (Google Workspace, Slack, Azure AD).

Docmost — Best for Simple Team Wikis

Docmost (8K+ stars) is what you use when the requirement is simple: "we need a place to write and share team documentation." No databases, no whiteboards, no complex auth — just a clean, functional wiki.

What Makes It Stand Out

Simplicity: Docmost has the smallest feature set of the three tools, but that's the point. Everything you need, nothing you don't.

Spaces: Organize content into spaces — similar to Confluence's space concept. Different teams or projects get their own space with independent permissions.

Minimal infrastructure: Just the Docmost app and PostgreSQL. Optional Redis. This is the lightest deployment of the three tools.

services:
  docmost:
    image: docmost/docmost:latest
    ports:
      - "3000:3000"
    environment:
      - DATABASE_URL=postgresql://...
      - APP_SECRET=your-secret
  db:
    image: postgres:16-alpine

Two containers to deploy. No auth provider dependency — Docmost has built-in email/password auth plus social login options.

User management: Invite users by email, set roles (owner, admin, member), and manage space permissions. Straightforward without complexity.

Inline comments: Comment on specific text within documents for review workflows.

When Docmost Is the Right Choice

Docmost is best when:

• Your team is small (under 50 people)
• You want to be running in under 30 minutes
• You don't have an existing OIDC provider (Outline's main requirement)
• You value simplicity over features

Limitations

Docmost is newer than Outline and lacks some features:

• Less mature API than Outline
• Fewer auth provider integrations
• Less battle-tested for large deployments
• Smaller community for support

Best for: Small teams (5-30 people) who want a functional wiki deployed quickly with minimal infrastructure.

AFFiNE — Best for Docs + Whiteboards

AFFiNE (62K+ GitHub stars) takes a fundamentally different approach. It's not just a document tool — it's a unified workspace that combines documents (page mode) with an infinite canvas whiteboard (edgeless mode).

What Makes It Stand Out

Canvas + docs hybrid: Switch between structured document view and freeform whiteboard for the same content. Drag document blocks onto the canvas to create visual arrangements. This is AFFiNE's unique value.

Edgeless mode: An infinite canvas where you can draw, add notes, create mind maps, sketch diagrams, and arrange ideas spatially. Similar to Miro, but integrated with your documents.

Block-based architecture: Everything in AFFiNE is a block — text, image, table, code, database, whiteboard element. Blocks can be rearranged, referenced, and embedded.

Offline-first: AFFiNE's desktop application (Electron) works fully offline. Documents sync when you're back online.

Local-first option: Data can live locally on your device, not just on a server.

Self-Hosting

services:
  affine:
    image: ghcr.io/toeverything/affine-graphql:stable
    ports:
      - "3010:3010"
  redis:
    image: redis
  postgres:
    image: postgres:latest

Three services. AFFiNE's self-hosting documentation has improved significantly from earlier versions.

Limitations

• Document-only search is less mature than Outline
• Auth integration options are fewer (no LDAP, limited SAML)
• The whiteboard focus means pure document workflows can feel cluttered
• API is less comprehensive than Outline
• Self-hosting documentation, while improved, has fewer community resources than Outline

Best for: Design teams, product managers, and teams who need both structured documentation and visual thinking tools in one self-hosted platform.

Three-Way Comparison: Core Tasks

Creating a Team Wiki Entry

Outline: Navigate to collection → New document → Write. Clean editing experience. Auto-saved, version history automatic.

Docmost: Select space → New page → Write. Equally simple. Inline commenting available immediately.

AFFiNE: Choose page mode → New page → Write. Nearly identical to the others for pure document creation.

Winner: Tie between Outline and Docmost for simplicity.

Setting Up New Team Member Access

Outline: Invite via email → Auth provider handles login → Assign to collections. BUT requires the auth provider to be configured first.

Docmost: Invite via email → They set a password → Assign to spaces. Works immediately with built-in auth.

AFFiNE: Invite to workspace → They create an account → Access granted.

Winner: Docmost (no auth provider dependency).

Adding a Visual Diagram to Documentation

Outline: Embed Excalidraw, Miro, or draw.io via iframe/link. Not native.

Docmost: Similar embed options. Not native.

AFFiNE: Draw diagrams natively on the canvas, embed in documents. First-class feature.

Winner: AFFiNE (by a large margin for visual content).

Cost Comparison: Commercial vs Self-Hosted

Notion Business (20 Users)

Plan	Monthly	Annual
Plus	$10/user	$2,400
Business	$18/user	$4,320

Self-Hosted (20 Users)

Tool	Server	Annual
Outline (Hetzner CPX21)	$6.50/mo	$78
Docmost (Hetzner CAX11)	$4/mo	$48
AFFiNE (Hetzner CPX21)	$6.50/mo	$78

The server cost is essentially the same for all three. You're choosing based on features, not cost.

Decision Guide

Choose Outline if:

• You have 20+ team members
• You already have Google Workspace, Slack, or Azure AD for auth
• Stability and maturity matter more than features
• You need the most comprehensive API and integrations

Choose Docmost if:

• You're a small team (under 30 people)
• You want to be running in 30 minutes
• You don't have an existing OIDC provider
• Simplicity is more important than enterprise features

Choose AFFiNE if:

• Your team does design, product, or visual thinking work
• You need whiteboard + documentation in one tool
• You want to replace both Miro and Notion
• Visual-first workflows matter to your team

Migrating Existing Documentation

If you're migrating from Confluence, Notion, or another tool, the import story is different for each option and significantly affects how much work the migration involves.

Outline: Has the most mature import path from Notion — the built-in Notion importer handles page hierarchies, embeds, and markdown formatting with reasonable fidelity. Confluence migration is more painful: export Confluence spaces as HTML, then use community scripts to convert to Markdown before importing. The Outline import from Confluence preserves document structure but loses comments, page history, and many Confluence-specific macros. For teams migrating from GitHub wikis or other Markdown-based tools, Outline's folder-based import via .zip archive is the fastest path.

Docmost: Import support is minimal at this stage of its development — primarily Markdown files. If you have a Notion or Confluence export, expect to handle significant post-import cleanup. This is the most common complaint from Docmost early adopters coming from established wikis.

AFFiNE: AFFiNE's import story is the most complex because its data model is different from traditional wikis — pages can exist on a canvas rather than just in a document tree. Importing from Notion gives you documents in AFFiNE's page view, but the canvas features require building from scratch. For teams whose value from Notion comes from linked databases and table views rather than pages, AFFiNE is not a direct replacement — that content requires rebuilding in AFFiNE's limited database/table feature.

The practical advice for large migrations: run a parallel period of 4–6 weeks where both tools are accessible. Let teams gradually move active documentation rather than doing a forced one-day cutover. Wiki migrations fail most often when content quality is poor — a forced migration of years of stale documentation creates a new wiki filled with stale documentation. Use the migration as an opportunity to prune pages that haven't been touched in 12+ months.

For the complete Outline setup including the OIDC authentication requirement, MinIO storage configuration, and production hardening steps, the self-hosting guide for Outline covers the full deployment process. Teams choosing between a wiki tool and a full knowledge base ecosystem should read Docmost vs Outline vs BookStack for a comparison that includes BookStack's role-based content permissions, which are particularly useful for organizations that need different access levels for different documentation audiences. Before deploying any of these tools in production, the self-hosting security checklist covers the firewall, HTTPS, and access control steps that prevent the most common self-hosted wiki security incidents.

Find Your Knowledge Base

Browse all knowledge base and wiki tools on OSSAlt — compare Outline, Docmost, AFFiNE, AppFlowy, BookStack, and every other open source knowledge management platform with deployment guides and feature comparisons.

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