5 Open-Source Notion Alternatives You Can Self-Host (2026)
Notion Team costs $16 per user per month. For a 10-person team that's $160/month — $1,920/year — for a notes and wiki tool where your data lives on Notion Labs' servers and your search is rate-limited on the free tier. Self-hosting an open-source alternative on a 4 GB Liquid Web VPS costs around $15–$33/month regardless of headcount, your data never leaves your infrastructure, and you're not subject to per-seat pricing that compounds as the team grows.
The tools below range from polished Notion clones with block editors to classic hierarchical wikis. Pick based on your team's workflow and how much Notion muscle memory you're working around.
1. Outline
License: BSL 1.1 (converts to Apache 2.0 in 2030) | Stars: ~38,300 | Language: Node.js + React
Outline is the most polished self-hosted knowledge base available. The editor feels close to Notion — slash commands, nested pages, embeds, and real-time collaborative editing. It has a clean sidebar, full-text search, and first-class API support for programmatic content management.
The setup requires an OAuth provider (Slack, Google, or any OIDC-compatible IdP) for authentication — Outline has no built-in username/password login. This is a deliberate security decision but adds a prerequisite: you need either an existing Google Workspace, Slack team, or a self-hosted OIDC provider like Pocket ID before you can log in.
License note: BSL 1.1 is source-available, not OSI-approved open source. Internal use is unrestricted. You may not sell Outline as a hosted service. The license converts to Apache 2.0 on 2030-01-01.
Self-hosted guide: Deploy Outline on a Liquid Web VPS
Stats at a glance:
- Idle RAM: ~400 MB (Node.js + PostgreSQL + Redis)
- Real-time collaborative editing via CRDT
- Full-text search with dedicated search index
- Requires OAuth (Slack / Google / OIDC) — no password login
- Minimum VPS: 4 GB RAM
2. AppFlowy
License: AGPL-3.0 | Stars: ~65,000 | Language: Rust + Flutter (desktop) / TypeScript (web)
AppFlowy is the most direct Notion feature clone: rich text documents, databases (table, board, calendar, grid), kanban boards, and a desktop app for macOS, Windows, and Linux — all backed by a self-hosted server. The AGPL license means full open-source freedoms with copyleft obligations if you distribute.
The web-based self-hosted version (AppFlowy Cloud) is the target for teams. The desktop app syncs to your own AppFlowy Cloud instance, which makes it one of the few tools here with a first-class offline-capable desktop client. Resource footprint is higher than Outline: plan for 4–8 GB RAM under active use with multiple users.
Stats at a glance:
- Idle RAM: ~600–900 MB (AppFlowy Cloud server + Postgres + MinIO)
- Database views: table, board, calendar, gallery, grid
- Desktop app (macOS, Windows, Linux) syncs to self-hosted server
- AI features available (connect your own API key)
- Minimum VPS: 4 GB RAM (8 GB recommended for teams)
3. AFFiNE
License: MIT | Stars: ~50,000 | Language: TypeScript + Rust (WASM)
AFFiNE combines a block-based document editor with an infinite-canvas whiteboard in a single workspace — think Notion + Miro in one tab. Pages can switch between document mode and whiteboard mode, which makes it genuinely useful for teams that mix structured writing with freeform diagramming without context-switching tools.
The trade-off is resource weight and maturity. AFFiNE's self-hosted server (AFFiNE Cloud Self-Hosted) is still maturing as of 2026 — expect occasional rough edges in the Docker Compose setup. It also runs heavier than Outline: the WASM runtime and real-time sync layer need at least 4 GB RAM, and 8 GB is more comfortable. If your team doesn't need the whiteboard canvas, Outline or AppFlowy will be a smoother experience.
Stats at a glance:
- Idle RAM: ~700 MB–1.2 GB
- Infinite canvas whiteboard + structured documents in one workspace
- MIT license — no restrictions
- Local-first architecture (works offline, syncs to server)
- Minimum VPS: 4 GB RAM (8 GB recommended)
4. Wiki.js
License: AGPL-3.0 | Stars: ~25,000 | Language: Node.js
Wiki.js is a classic wiki engine, not a Notion clone. It does not have Notion-style databases, kanban boards, or a block editor with drag-and-drop nesting. What it has is a very mature, very lightweight wiki with both Markdown and WYSIWYG editing, granular role-based access control, multiple authentication backends (local, LDAP, SAML, OAuth), and a resource footprint that fits on a 2 GB VPS.
It's the right pick when your team's actual need is a structured documentation site — product docs, runbooks, internal SOPs — rather than a team workspace. The UX is closer to Confluence than Notion.
Stats at a glance:
- Idle RAM: ~150–256 MB (exceptionally light)
- WYSIWYG + Markdown editing
- 50+ authentication providers (local, LDAP, SAML, Google, etc.)
- Full-text search with multiple engine options (built-in, Elasticsearch, Azure)
- Minimum VPS: 2 GB RAM
5. BookStack
License: MIT | Language: PHP + MySQL
BookStack organizes content in a strict three-level hierarchy: Books → Chapters → Pages. This makes it the most opinionated tool in this list, but also the easiest to onboard for teams that have never used a wiki before — the structure is self-explanatory. It's PHP + MySQL, runs on minimal resources, and has a clean WYSIWYG editor with Markdown support.
The right use case is technical documentation and internal handbooks where the hierarchical structure is an asset rather than a constraint. It is not a good fit for freeform research notes or team project management.
Stats at a glance:
- Idle RAM: ~80–128 MB (very light PHP stack)
- Three-level hierarchy: Books → Chapters → Pages
- WYSIWYG editor with Markdown and code blocks
- LDAP, SAML, and OAuth authentication
- Minimum VPS: 2 GB RAM
Comparison table
| Tool | License | Stars | Editor style | Databases/boards | Idle RAM | Min VPS |
|---|---|---|---|---|---|---|
| Outline | BSL 1.1 → Apache 2030 | ~38,300 | Block (Notion-like) | ✗ | ~400 MB | 4 GB |
| AppFlowy | AGPL-3.0 | ~65,000 | Block + databases | ✓ | ~600–900 MB | 4 GB |
| AFFiNE | MIT | ~50,000 | Block + whiteboard | ✓ | ~700 MB–1.2 GB | 4 GB |
| Wiki.js | AGPL-3.0 | ~25,000 | WYSIWYG + Markdown | ✗ | ~150–256 MB | 2 GB |
| BookStack | MIT | ~16,000 | WYSIWYG + Markdown | ✗ | ~80–128 MB | 2 GB |
Which should you choose?
- Closest Notion feel, team wiki focus: Outline. Needs an OAuth provider — pair it with Pocket ID if you don't have Google Workspace or Slack. Read the Outline setup guide.
- Full Notion feature parity (databases, kanban, desktop app): AppFlowy Cloud self-hosted on a 4–8 GB VPS.
- Notion + Miro combined: AFFiNE on a well-resourced VPS (8 GB).
- Classic wiki for technical docs, minimal resources: Wiki.js or BookStack on a 2 GB VPS.
Outline delegates authentication entirely to an OAuth or OIDC provider rather than storing password hashes itself. The practical effect is that if your provider (Google, Slack, or a self-hosted OIDC server like Pocket ID or Authentik) is the source of truth for your team's identities, Outline inherits your existing SSO and MFA setup automatically — you don't manage separate passwords. The downside is that you must provision an OAuth app on your provider before you can log in to a fresh Outline instance. For most teams with an existing Google Workspace or Slack, this is a 10-minute setup step.
No. BSL 1.1 places one restriction: you may not offer Outline as a hosted service to third parties. Internal use by your team — no matter how large — is fully permitted. The license converts to Apache 2.0 on 2030-01-01, at which point it becomes a standard permissive open-source license with no restrictions at all. If OSI-certified open source is a hard requirement for your procurement process, AppFlowy (AGPL-3.0) or AFFiNE (MIT) are the alternatives.
Notion Team at $16/user/month for 20 users costs $320/month ($3,840/year). Outline on a 4 GB Liquid Web Managed VPS costs approximately $33/month — about 10% of the Notion bill — with no per-seat charges. Wiki.js and BookStack run on a 2 GB VPS for around $15/month. The VPS cost is fixed regardless of whether you have 5 users or 500.