Obsidian
Local-first knowledge base on a folder of markdown files.
Obsidian is the most popular markdown knowledge base: your vault is simply a local folder of .md files, connected by wiki-style [[links]] and visualized as a graph of linked thought.
Backlinks, canvas boards, dataview queries, and thousands of community plugins extend it endlessly, while the plain-markdown storage guarantees your notes outlive the app. Free for personal use, with optional paid sync and publish services.
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Try markdown before you install anything
The free online markdown editor gives you a live side-by-side preview in the browser — a quick way to test the syntax Obsidian uses, with nothing to download or sign up for.
Open the editor