Best open-source alternatives to Notion (2026)

AppFlowy is an open-source AI workspace for notes, docs, wikis and project management, positioned as an alternative to Notion.

An open-source, local-first knowledge base that merges docs, whiteboard canvas and tables in one workspace, as an alternative to Notion and Miro.

All-in-one AI app for chatting with your documents and running AI agents, with local-first setup, multi-user support and many LLM providers.

Self-hosted, privacy-first knowledge workspace with block-level references, Markdown WYSIWYG editing, and AI agent collaboration.

Self-hostable, API-oriented low-code platform that works like a collaborative spreadsheet-database, positioned as an Airtable alternative.

A self-hosted, privacy-focused AI note-taking app for quickly capturing fleeting thoughts as Markdown cards with natural-language search.

Official Electron desktop client for Anytype, a local-first, end-to-end encrypted personal knowledge base for macOS, Windows and Linux.

A local, private markdown editor with WYSIWYG editing and side-by-side AI editing through Claude, Codex and other agents via MCP and CLI.

A set of 8 AI agents and 14 skills that manage an Obsidian vault through chat, covering notes, email, calendar, and meeting transcripts.

A self-hosted, offline-first knowledge base with an extended Markdown editor, team workspaces, OIDC SSO and S3-backed storage.

Markdown knowledge graph with an LSP for your editor and a CLI and MCP server so AI agents can read and write the same notes.

Self-hosted enterprise knowledge hub that compiles company docs into a wiki and serves it to Claude and other LLMs via an MCP server with department-scoped access.

Local-first, markdown-based notes app for macOS, Windows, Linux, Android and iOS, with optional sync to your own storage or server.

Self-hosted notes app in a single Go binary, storing notes as Markdown files alongside a local SQLite database with full-text search.

A free, self-hosted note-taking app with rich text and Markdown notes, task lists, a diary, and sharing, offered as an alternative to Notion and Obsidian.

Open-source database and workspace where AI agents and people share structured records, docs, skills, and apps, with reviewed writes.