Open Source Alternatives to Obsidian

AppFlowy

AGPL-3.0

Open source collaborative workspace combining notes, databases, and AI with full data ownership, offline support, and self-hosting options.

Orgnise

AGPL-3.0

A versatile project management platform that combines task organization, team collaboration, and workflow automation in one intuitive interface.

Docmost

AGPL-3.0

Self-hosted wiki platform for enterprise teams with real-time collaboration, built-in AI, SSO, RBAC permissions, and compliance support for ITAR, FedRAMP, and GDPR.

XWiki

LGPL-2.1

XWiki is a flexible, feature-rich wiki software that helps organizations structure and share knowledge efficiently.

AnyType

Unknown

A local-first, encrypted workspace for notes, tasks, databases, and chats. Your data stays on your device, syncs peer-to-peer, and never passes through a central server.

Beaver Notes

MIT

A privacy-focused, offline-first note-taking app that stores everything on your device, with Markdown, note linking, file attachments, LaTeX math, and bring-your-own sync.

Blinko

GPL-3.0

The next generation of open-source AI-powered card notes designed to help you quickly capture and organize inspiration so that ideas never run out.

Darkwrite

AGPL-3.0

A customizable, offline-first note editor that lets you format text, create lists, add images, and export to HTML - all while maintaining your privacy.

Joplin

Unknown

Cross-platform note-taking app with end-to-end encryption, Markdown support, web clipping, and sync via Dropbox, OneDrive, or Joplin Cloud.

Justnote

GPL-2.0

Justnote is a secure note-taking app that lets you easily create and sync notes across devices while maintaining full control of your data.

Logseq

AGPL-3.0

Local-first, open-source knowledge management tool with bidirectional linking, outlines, flashcards, PDF annotations, and whiteboards for building a connected second brain.

Memos

MIT

Memos is a self-hosted, open-source note-taking app built around a private timeline. Write in Markdown, skip the folder setup, and keep your data on your own server.

Notesnook

GPL-3.0

End-to-end encrypted note-taking app with zero-knowledge architecture, cross-device sync, web clipper, and a self-hostable sync server.

OpenNotas

Unknown

OpenNotas is a multi-platform, end-to-end encrypted note-taking app that offers simplicity, synchronization, and offline functionality.

SiYuan

AGPL-3.0

Personal knowledge management system with WYSIWYG block editing, bidirectional links, spaced repetition flashcards, a relational database, and end-to-end encrypted sync.

Standard Notes

AGPL-3.0

Cross-platform note-taking app with end-to-end encryption, offline access, and powerful organization features for privacy-conscious users.

Tolaria

AGPL-3.0

A free, open source note-taking app built on plain Markdown files, Git version control, and direct AI model integration. No account required.