Obsidian is a local first, markdown based knowledge base where you link notes into a personal knowledge graph, loved by power users wanting a private, future proof, highly linkable second brain. Your notes are plain markdown files stored locally on your own device, which you link together with internal links to build a connected web of knowledge, visualised as a graph, with a huge library of community plugins to extend it, and optional paid Sync and Publish services. Because notes are local plain text files you own, Obsidian is private, future proof and fast, and its linking and plugins make it extremely powerful. Loved by developers, researchers, writers and knowledge workers wanting a private, linked personal knowledge base, Obsidian suits power users who value data ownership. For a local, linked knowledge base, Obsidian is a leading choice.
Obsidian's distinction is being local first and link based, with notes as plain markdown files you own. Unlike cloud tools, your knowledge lives as local plain text files on your device, private and future proof, and you link notes into a personal knowledge graph, with community plugins extending it endlessly, which cloud, proprietary tools cannot offer for data ownership and linked thinking. That local first, linkable, extensible nature sets it apart.
Obsidian is best for developers, researchers, writers and knowledge workers who want a private, local first, highly linkable personal knowledge base they own as plain text files, and who value data ownership, linking and extensibility. It suits power users wanting a local, linked second brain. It is a weaker fit for those wanting a simple cloud note app, where Evernote fits, a flexible team workspace, where Notion fits, the Microsoft ecosystem, where OneNote fits, or team wikis, where Confluence fits.
The core strengths are local plain markdown files you own, internal linking to build a connected knowledge graph, a graph view, a huge library of community plugins to extend functionality, and fast, offline, private operation, with optional paid Sync and Publish. Obsidian offers data ownership, power and extensibility. Its local first, linkable, plugin extensible nature is its defining advantage.
Obsidian is free for personal use. Optional paid add ons include Sync (to sync notes across devices, around 4 to 5 US dollars a month) and Publish (to publish notes online), and a commercial licence is required for business use. So personal use is free, with paid services only if you want official sync or publishing. Details are on the Obsidian pricing page.
Obsidian has a vast community plugin ecosystem (thousands of plugins) and themes that extend it for almost any workflow, plus it works with any tool that reads markdown files and syncs via your own cloud or Obsidian Sync. Its enormous plugin ecosystem and plain markdown openness, which let power users customise and connect it endlessly, are a signature strength.
Local first, link based knowledge you own is the signature strength: Obsidian stores your notes as local plain markdown files you own, private and future proof, and lets you link them into a personal knowledge graph extended by community plugins, which cloud proprietary tools cannot offer. For power users valuing ownership and linked thinking, this is the main reason to choose Obsidian.
Obsidian is very highly rated by its community for ownership, linking, plugins and being free, with active community support, though it is more technical and setup heavy than simple note apps. Its reviews praise data ownership, linking and extensibility, with the learning curve and self managed sync the main considerations.
For developers, researchers, writers and knowledge workers wanting a private, local first, highly linkable personal knowledge base they own, Obsidian is an excellent, beloved choice. The main caution is that it is more technical and setup heavy, so those wanting a simple cloud note app may prefer Evernote, a flexible team workspace Notion, and team wikis Confluence, but for a local, linked knowledge base Obsidian leads.
These note-taking & knowledge mgmt tools come up most often against Obsidian.
Connected workspace for notes, docs and wikis
Longstanding note capture and organization app
Freeform digital notebook in Microsoft 365