Second Brain by Hexact

What it does

Second Brain is a local desktop app that gives Claude Desktop persistent memory through MCP. It creates a personal database on your machine where you store contacts, customers, meeting notes, ideas, business data and scraped data. Then Claude reads and writes to it, with your permission, through normal conversation. Ask Claude about a customer and it pulls the answer from your records. Log a meeting and it saves the notes to your database. Look up an article, a competitor, a decision.

Keep your notes, contacts and business data in a local database Claude, Codex or any MCP client can query directly. Nothing ever leaves your machine.

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  Persistent memory for Claude, ChatGPT & Cursor. Free.

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  Second Brain2025 · second-brain-lac-ten.vercel.app · ▲302

  Hi HN, I'm Dom, a solo founder. I built Second Brain to solve a common issue I had with AI chats: the knowledge disappears. There’s no structure, no memory, and no way to reuse or build on them. So I built a tool that combines AI chat with a visual, interconnected knowledge system. Key features: - Save AI responses into editable docs (Notion-style Pages). - AI Visual board with multiple content & chat nodes (like Miro meets ChatGPT). - Add and chat with YouTubes, TikToks, Audio, PDFs, GitHub repos, Looms, websites, etc. - Organize using Projects and Smart Tags — then chat with full contexts.…

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• AG
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