Granite
Encrypted second brain your AI tools can actually use
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Granite - Encrypted second brain your AI tools can actually use

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Granite is a Markdown second brain, encrypted with a separate key for every vault and synced across phone, tablet, desktop and web. A built-in MCP server lets Claude, ChatGPT and Cursor search, read and update your notes, only in the vaults you allow, with answers that cite the exact note. Wikilinks, backlinks, graph, offline search, live co-editing, and SSO, SCIM and audit logs for teams. Never used to train AI. Free forever; Pro $3.99/mo, no AI surcharge.

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Hi Product Hunt, Julian here 👋 I wanted my notes to be useful to the AI tools I use every day, without pasting my life into a chat window or handing my notes to a company that trains on them. Granite is the result: plain Markdown, encrypted with a separate key per vault, synced everywhere and fast offline. Its built-in MCP server lets Claude, ChatGPT or Cursor search and cite your notes, but only in the vaults you choose, and you can disconnect any app in one click. It also works as a company brain, with live co-editing, comments, SSO and audit logs. Happy to answer anything about the security model, and I'd love to hear how you'd use your second brain with AI.