Obsidian is a local-first knowledge management app that stores all your notes as plain Markdown files on your own device. Its defining feature is bi-directional linking — every link between notes creates a connection that shows up in both directions, and the graph view visualises your entire knowledge base as an interactive network of connected ideas.
Unlike cloud-based tools like Notion, Obsidian runs entirely on your device. There's no account required, no internet connection needed and your notes are just plain text files you can open in any editor. This makes it the preferred choice for users who prioritise privacy and data ownership.
The plugin ecosystem is one of Obsidian's biggest strengths — over 1,000 community plugins add features including AI writing assistance, spaced repetition flashcards, task management, daily notes templates and more. AI plugins like Copilot and Smart Connections bring AI capabilities directly into your Obsidian vault.
Who is Obsidian for?
Researchers, writers, developers and knowledge workers who want to build a long-term personal knowledge base. Particularly popular with academics, authors working on long-form projects and developers who want to keep technical notes in a connected system. Less suited to teams needing real-time collaboration.