Best Open Source Note-Taking and Wiki Tools in 2026
Best Open Source Note-Taking and Wiki Tools in 2026
Notion costs $10/user/month. Confluence costs $6.05/user/month. Here are the best open source alternatives for team knowledge bases, documentation, and note-taking.
Quick Comparison
| Tool | Best For | License | Stars | Self-Host |
|---|---|---|---|---|
| Outline | Team wiki (Notion-like) | BSL → Apache-2.0 | 28K+ | Docker |
| BookStack | Structured documentation | MIT | 15K+ | Docker |
| Wiki.js | Developer wikis | AGPL-3.0 | 25K+ | Docker |
| AppFlowy | Personal Notion alt | AGPL-3.0 | 56K+ | Desktop/Docker |
| Docmost | Modern team wiki | AGPL-3.0 | 7K+ | Docker |
| Obsidian | Personal notes (not OSS) | Proprietary | — | Local files |
| Logseq | Outliner/graph notes | AGPL-3.0 | 33K+ | Desktop |
| SiYuan | Block-based notes | AGPL-3.0 | 22K+ | Desktop/Docker |
Detailed Breakdown
Outline — Best Team Wiki
Replaces: Notion, Confluence
- Real-time collaboration
- Markdown with slash commands
- Collections and nested documents
- Native Notion and Confluence importers
- Full-text search
- Clean, beautiful UI
- API access
Requires: OIDC auth provider (Google, GitHub, Keycloak), S3 storage.
Best for: Teams who want a polished, collaborative wiki that looks as good as Notion.
BookStack — Best Structured Documentation
Replaces: Confluence, MediaWiki
- Organized hierarchy: Shelves → Books → Chapters → Pages
- WYSIWYG and Markdown editors
- Diagram integration (draw.io)
- Page revision history
- Granular permissions
- LDAP/SAML auth
- Full API
Best for: Organizations that need structured documentation with clear hierarchy and permissions.
Wiki.js — Best for Developers
Replaces: Confluence, GitHub Wiki
- Multiple editors (Markdown, WYSIWYG, raw HTML)
- Git sync (back docs to a repo)
- Diagram support (Mermaid, PlantUML, draw.io)
- Multiple auth providers
- 10+ search engines (PostgreSQL, Elasticsearch, etc.)
- Localization (40+ languages)
Best for: Development teams who want Git-backed documentation with powerful search.
AppFlowy — Best Personal Notion Alternative
Replaces: Notion (personal use)
- Notion-like block editor
- Database views (table, board, calendar, grid)
- Templates
- Local-first (data stays on your device)
- Desktop apps (Mac, Windows, Linux)
- Mobile apps
Best for: Individual users who want a Notion-like experience without cloud dependency.
Docmost — Newest Contender
Replaces: Notion, Confluence
- Real-time collaboration
- Spaces and nested pages
- Rich text editor with slash commands
- Comments and mentions
- Permission system
- Clean, modern UI
Best for: Teams wanting a newer, actively-developed alternative to Outline.
Choosing the Right Tool
| Need | Choose |
|---|---|
| Team collaboration wiki | Outline or Docmost |
| Structured docs with hierarchy | BookStack |
| Developer-focused wiki | Wiki.js (Git sync, Mermaid) |
| Personal note-taking | AppFlowy or Logseq |
| Replacing Confluence | BookStack or Outline (both have importers) |
| Replacing Notion | Outline (team) or AppFlowy (personal) |
| Graph-based notes | Logseq |
Cost Savings
| Team Size | Notion Team | Self-Hosted (Outline) | Annual Savings |
|---|---|---|---|
| 10 users | $1,200/year | $96/year (VPS) | $1,104 |
| 50 users | $6,000/year | $192/year (VPS) | $5,808 |
| 100 users | $12,000/year | $192/year (VPS) | $11,808 |
Compare all wiki and note-taking tools on OSSAlt — features, editors, and self-hosting options side by side.