Description
Obsidian stores notes as plain markdown files on the local file system instead of in a proprietary database, which keeps your data portable and independent of any vendor at all times. Its core function is linking notes to one another, complete with backlinks and a graph view, which makes the tool attractive for Zettelkasten methods, personal knowledge bases, and interconnected project documentation. An extensive plugin ecosystem extends the base functionality with task management, calendar views, kanban boards, and database-like queries, and MCP connections also exist that let you read and edit vault contents from tools such as Claude Code.
The key difference from cloud note apps lies in local file ownership: the app itself is free to use, while optional add-on services such as encrypted cross-device sync and publishing notes as a website are paid extensions. Without such a subscription, synchronization can also be handled through your own tools such as iCloud, Dropbox, or Git, which means more setup effort but no ongoing costs. The learning curve is noticeable for newcomers without markdown or Zettelkasten experience, and the plugin system can become cluttered if it grows without any oversight.
Obsidian is part of the active Voyage stack as a local knowledge base, connected among other things via MCP to read, search, and maintain notes directly from Claude Code.
