What makes a note app an "MCP note app"
A normal note app stores text for you to read. An MCP note app adds a server that speaks the Model Context Protocol, so an AI assistant can connect and use your notes as tools: search them, read them, create new ones, and update existing ones. The notes become live context for every conversation, not a file you copy and paste from.
Which note apps have an MCP server
Support varies, and the important detail is whether the server is hosted (a remote assistant like ChatGPT on the web can reach it) or local (only desktop clients on the same machine).
How to pick
If you only ever use a desktop client like Claude Desktop on one machine, a local MCP note app such as Bear or Joplin is simple and affordable. Note that "official" and "reachable" are different things: Joplin's server is built in and official, but it listens on 127.0.0.1, so ChatGPT on the web cannot connect to it. If you use ChatGPT or Claude on the web and your phone, or you want both assistants to share one memory, pick a hosted one. Hjarni is hosted, stores plain Markdown you can export, and works with every MCP client, so the same notes follow you across tools. Notion MCP and Basic Memory Cloud also offer hosted endpoints. See the full best MCP knowledge base roundup for how the options compare.