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 |
Self-Hosting Requirements and Infrastructure Planning
Deploying a team wiki is a longer-term commitment than most self-hosted services because your documentation accumulates over time and people come to rely on it daily. Getting the infrastructure right from the start avoids painful migrations later.
Outline is the heaviest option in the group, requiring a Redis instance for real-time collaboration alongside its Node.js process and a PostgreSQL database. A minimum production-worthy setup runs on 2 GB of RAM — a $6/month Hetzner CX22 instance can handle teams of up to 30 with reasonable load. Beyond that, 4 GB is comfortable. The more significant requirement is an S3-compatible object store for file attachments and images. Backblaze B2 or Cloudflare R2 both work and cost practically nothing for documentation-scale storage — expect under $1 per month unless your team uploads large files constantly. Outline also requires an OIDC-compatible authentication provider, which integrates naturally if you are already running Authentik or Logto for your self-hosted stack.
BookStack is a PHP application backed by MySQL or MariaDB, which means it runs on almost any shared hosting environment and is comfortable on 1 GB of RAM. If you already operate a LAMP-style server for other workloads, BookStack can coexist without a dedicated instance. Docker deployment is straightforward and the official image is well maintained. BookStack stores file uploads on local disk by default, so plan your volume mounts appropriately and set up an offsite backup to S3 or Backblaze from day one — documentation is invaluable and losing it to disk failure would be catastrophic.
Wiki.js is a Node.js application with flexible database support — PostgreSQL, MySQL, MariaDB, MS SQL, or even SQLite for light personal use. Its standout self-hosting feature is the optional Git sync: every page can be committed to a Git repository automatically, giving you a plain-text, version-controlled backup that lives completely independently of your database. This makes Wiki.js an excellent choice if your team already thinks in terms of Git workflows. Resource requirements sit around 512 MB to 1 GB of RAM for a typical deployment. The multiple search backend options (PostgreSQL full-text, Elasticsearch, Manticore) let you tune performance as the wiki grows.
Docmost is the newest entrant and shares a similar stack to Outline — Node.js and PostgreSQL — but currently requires no separate object store for basic deployments, which lowers the setup barrier. It is actively developed and has been gaining adoption quickly, though it has fewer community plugins and fewer years of production hardening than Outline or BookStack. For teams starting fresh, it is worth evaluating head-to-head with Outline. Both can be tested on a $6 VPS in under an hour.
For all these tools, a Caddy or Nginx reverse proxy with automatic TLS via Let's Encrypt is the standard pattern. Pair that with daily database dumps shipped to an offsite location and you have a resilient setup. If you want a control plane that manages multiple self-hosted services from a single dashboard — including your wiki, your communication tools, and your analytics — Coolify is an excellent choice: it handles SSL, reverse proxying, environment variables, and one-click updates through a web UI.
Security, Access Control, and Compliance Considerations
Team wikis present an interesting security surface because they accumulate sensitive information over time: infrastructure documentation, credential rotation procedures, customer-facing playbooks, and internal policies. Access control deserves careful thought before you deploy.
Outline's permission model is collection-based. You can create public collections visible to all workspace members, restricted collections for specific teams, and invite-only collections for sensitive material. Combined with OIDC authentication, you can gate access to specific collections by group membership from your identity provider — meaning engineers see the infrastructure docs and finance sees the billing runbooks, without anyone needing to manually manage permissions. This is a meaningful advantage over simpler tools.
BookStack uses a granular roles-and-permissions system. Permissions apply at the shelf, book, chapter, and page level, and you can build roles like "Finance Reader" that only allow viewing certain books. LDAP and SAML integration means permissions can be driven by directory groups, which is important for organizations subject to SOC 2 or ISO 27001 controls where access should be provisioned and de-provisioned automatically.
Wiki.js supports multiple auth sources simultaneously — you can allow local accounts, LDAP, SAML, and social login at the same time, applying different page permissions per auth group. Its audit logging records who viewed, created, edited, or deleted each page, which satisfies audit trail requirements for compliance-conscious organizations.
For teams operating under GDPR, all three tools allow full data residency control since you own the server. There is no data leaving your infrastructure to a third party's cloud. Backups are under your control, and you can implement retention policies appropriate to your jurisdiction. If your organization is subject to EU data sovereignty requirements — a trend accelerating as European companies re-evaluate US cloud dependencies — self-hosted documentation tools are a natural fit alongside the broader EU digital sovereignty movement.
One underappreciated risk is the wiki becoming a single source of truth for credential information. Establish a clear policy: credentials belong in your password manager (a self-hosted Vaultwarden instance, for example), and the wiki documents the process for accessing them, not the credentials themselves. This separation of concerns significantly reduces the blast radius of a compromised wiki account.
Migrating from Notion or Confluence and Long-Term Viability
The migration path from Notion is genuinely easy for Outline and Docmost — both ship with native Notion importers. Outline's importer handles nested pages, embedded images, and most block types. The main limitation is Notion databases: Outline and Docmost do not have database views, so database-heavy Notion setups will feel different after migration. For teams using Notion primarily as a wiki rather than a database tool, the transition is largely frictionless. Export your Notion workspace to HTML or Markdown, import into Outline, and spend a few hours cleaning up formatting.
For teams migrating from Confluence, BookStack is the natural landing spot because its hierarchy — shelves, books, chapters, pages — maps cleanly onto Confluence's spaces, spaces, pages, children structure. Confluence's export format is a ZIP of HTML files, and BookStack has a community-maintained importer that handles the bulk of the work. Outline also handles Confluence imports for teams preferring its UI. If you are running Confluence alongside Jira and considering migrating both, the Jira to Plane migration guide covers the project management side of that transition.
In terms of long-term project viability, Outline is backed by a commercial entity (General Outline, Inc.) that sells the cloud-hosted version, which funds ongoing development while the self-hosted version remains free. BookStack has been consistently maintained for over eight years by its primary author with strong community contributions. Wiki.js has a large contributor base and a commercially-backed cloud offering. AppFlowy raised venture funding and has a growing team. Docmost is newer but has demonstrated rapid development velocity. All five tools show strong signals of continued maintenance.
The cost picture makes the case strongly. A 50-person team on Notion at $10 per user per month pays $6,000 per year. Self-hosting Outline on a $14/month Hetzner instance with $1/month Backblaze B2 storage costs $180 per year — a 97% reduction. Even accounting for the 2 hours of initial setup and roughly 30 minutes per month of maintenance, the effective hourly savings are significant. For organizations already running other self-hosted tools, the marginal cost of adding a wiki to an existing one-click deploy platform like Coolify is essentially zero beyond storage.
Compare all wiki and note-taking tools on OSSAlt — features, editors, and self-hosting options side by side.