Overview
Obsidian is a desktop and mobile knowledge management app that stores notes locally as plain-text Markdown files. It connects notes with links, tags, graph views, and Canvas, while plugins and themes let users adapt the workspace for research, journaling, documentation, or project planning. Publish turns selected notes into a web-based site. The core application is proprietary, but its public plugin API supports an extensive community ecosystem. Official community listings include AI plugins that can run agents, search vaults, summarize material, and help with writing, so AI use is available through extensions rather than an open-source core.