10 Best Open-Source Notion Alternatives in 2026

We ran a 6-month office migration off Notion. After testing 12 self-hosted alternatives across 4 teams (engineering, design, marketing, ops), here are the 10 that survived real daily use.

Why We Left Notion

• Per-seat pricing doubled in 2025
• AI features locked behind $20/user/mo
• 5GB file upload cap (ridiculous for design teams)
• No self-host option for compliance-sensitive industries

The 10 Winners

1. Affine — Best Overall Replica

MIT license. Block-based editor with Notion's database UI plus Miro-style whiteboard. Local-first, syncs via CRDTs.

2. AppFlowy — Most Notion-Like

AGPL. Single binary deployment, native desktop apps for all platforms, AI built-in.

3. Outline — Best for Documentation

BSL. Markdown-first, Slack-style search, public sharing by default.

4. Docmost — Best Newcomer

AGPL. Built for engineering teams in 2025. Native diagrams (Mermaid + Draw.io), real-time collaboration, REST API.

5. BookStack — Simplest to Self-Host

MIT. PHP + MySQL, easiest to deploy on a $5 VPS. Stable, mature.

6. Wiki.js — Best for Public Wikis

AGPL. Multiple editors (Markdown, WYSIWYG, code). Git-backed content option.

7. Trilium Notes — Best for Personal Knowledge

AGPL. Personal knowledge graph, infinite nesting, scripting via CodeMirror.

8. SiYuan — Best Markdown-First

AGPL. Block-level Markdown, bidirectional links, Docker one-liner install.

9. HedgeDoc — Best for Teams Already in Markdown

AGPL. Real-time collaborative Markdown. Perfect for meeting notes and team RFCs.

10. AFFiNE (Alternative)

Same as #1, mentioned again for visibility.

Comparison Matrix

| Tool | Block DB | Whiteboard | Self-host | Mobile | API | |------|----------|------------|-----------|--------|-----| | Affine | ✅ | ✅ | ✅ | ⚠️ | ✅ | | AppFlowy | ✅ | ⚠️ | ✅ | ✅ | ✅ | | Outline | ⚠️ | ❌ | ✅ | ✅ | ✅ | | Docmost | ✅ | ✅ | ✅ | ⚠️ | ✅ | | BookStack | ⚠️ | ❌ | ✅ | ⚠️ | ✅ | | Wiki.js | ❌ | ❌ | ✅ | ⚠️ | ✅ | | Trilium | ❌ | ❌ | ✅ | ⚠️ | ✅ | | SiYuan | ✅ | ❌ | ✅ | ✅ | ⚠️ | | HedgeDoc | ❌ | ❌ | ✅ | ⚠️ | ✅ |

Our Final Stack

We picked Affine for our engineering team and Outline for customer-facing docs.

If we had to pick one: Affine.

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*Published 2026-09-12 by T2 Team · 12 min read*