Overview
Obsidian is a local-first Markdown note app where your vault is a plain folder of files on your own disk, which is exactly why it suits long-running research: nothing is locked in a vendor's database and it keeps working offline. Be clear on what it is not — Obsidian ships no AI, mentions none on its own site, and its official plugin API runs inside the app rather than being callable over a network. The agent story is entirely community-built: a widely-used third-party plugin adds an authenticated REST API and its own MCP server, letting an agent search notes, patch sections by heading and trigger commands. That surface is one individual's project, not a vendor commitment, so if it stops being maintained the agentic path goes with it. There is no affiliate programme.
Key Features
- ✓Local-first vault of plain Markdown files you own
- ✓Third-party community plugin adds a REST API and MCP server
- ✓Structural edits by heading, block or frontmatter via that plugin
- ✓Large plugin ecosystem including community AI add-ons
- ✓Free for personal use; paid Sync and Publish add-ons
Obsidian Alternatives
Other AI Research & Intelligence tools to consider:
