Open-source alternatives to Notion

4 community-reviewed projects you can use instead of Notion.

1. Logseq - A privacy-first, local-first knowledge base and outliner built around daily journals, linked blocks and a knowledge graph, storing notes as local Markdown or Org-mode files. Available for Windows, macOS, Linux, Android and iOS. (Licence: AGPL-3.0)
2. AppFlowy - AppFlowy is an open-source AI collaborative workspace that brings projects, wikis and teams together in one app, with documents, databases in table, board, calendar and grid views, and real-time collaboration. Available for Windows, macOS, Linux, iOS and Android, with data stored locally, in AppFlowy Cloud, or on a self-hosted server. (Licence: AGPL-3.0)
3. Trilium Notes - Trilium is a free, open-source note-taking and personal knowledge base application built around a hierarchical note tree, with WYSIWYG and Markdown editing, note cloning, labels and relations, full-text search, encrypted protected notes, scripting and a REST API. It runs as a desktop app on Windows, macOS and Linux and can sync through your own self-hosted server. (Licence: AGPL-3.0)
4. SiYuan - SiYuan is a privacy-first, local-first, open-source personal knowledge management application built around fine-grained content blocks, with Markdown WYSIWYG editing, block-level references and bidirectional links, databases, flashcards and end-to-end encrypted sync. Available for Windows, macOS, Linux, Android, iOS and HarmonyOS, and self-hostable via Docker. (Licence: AGPL-3.0)