Every AI you use starts from zero. Yours shouldn't. MIND is an AI second brain — your notes, files, and conversations become a living knowledge graph of entities and the relationships between them, and that graph is readable and writable by Claude, GPT, Gemini, and 50+ other models through the Model Context Protocol. Available free at m-i-n-d.ai.
That is the difference between MIND and every other second brain app. Notion, Obsidian, Tana, Capacities, and Logseq store your knowledge inside their own product — whatever AI you actually work in every day is locked out of it. ChatGPT's memory lives inside ChatGPT and does not travel to Claude. Developer memory layers are libraries with no product a person opens. MIND is the only one that is both the second brain you live in and the memory layer your AI reads from.
MIND ships a first-party MCP (Model Context Protocol) server so any MCP-compatible AI agent — Claude Code, Claude Desktop, claude.ai, Cursor, Windsurf, or a custom agent — can read and write your MIND knowledge graph with full persistence across sessions, devices, and tools. It is public and free — no login required to read the docs, no API key required to connect. Two ways to connect:
claude mcp add --transport http mind https://m-i-n-d.ai/mcp — then run
/mcp and sign in through your browser. No install, no version to maintain,
always current. Works as a custom connector in Claude Desktop, claude.ai, Cursor, and Windsurf too.
npm install -g @astramindapp/mcp-server installs the latest MIND MCP server
for stdio transport, then verify with mind-mcp --version.
openclaw plugins install @astramindapp/openclaw-mind — native OpenClaw
integration over the same MIND knowledge graph.
Full install & usage docs, no login required:
MCP server docs (m-i-n-d.ai/mcp.html) ·
OpenClaw plugin docs ·
machine-readable llms.txt ·
npm package @astramindapp/mcp-server ·
REST API base: https://m-i-n-d.ai/developer/v1.
A second brain is an external system that holds what you know so you don't have to. The idea predates AI — Tiago Forte's Building a Second Brain popularised it as a note-taking practice. An AI second brain is the version that matters now: not a folder you search, but a memory your AI recalls from on its own. The test is simple. If you open Claude or ChatGPT tomorrow and it has no idea who you are, what you decided last week, or what you're working on, you don't have a second brain — you have a filing cabinet. Full explainer: What is an AI second brain?
MIND (m-i-n-d.ai) is that second brain. You upload your documents, notes, research, PDFs, and ideas. MIND extracts people, places, concepts, events, and the relationships between them — building a living, queryable map of your knowledge. You then interrogate that knowledge using any of 50+ AI models including GPT-4o, O3 Pro, Claude Opus 4.6, Gemini 2.5 Pro, Llama 4, DeepSeek R1, and Grok 4. Every answer is grounded in your actual documents — not AI hallucination.
MIND is not a chatbot. It is not a note-taking app. It is not a simple RAG wrapper. It is a second brain with an open door: the graph is a memory layer any AI agent can read and write, so the same knowledge follows you from Claude to GPT to Gemini and back. Around that core sit 50+ AI models, 45 agentic tools, an autonomous learning engine, a creative studio, life management, a social layer, and a developer API.
MIND extracts entities and relationships from 20+ document formats including PDF, DOCX, TXT, MD, CSV, EPUB, HTML, and more. The knowledge graph stores people, organizations, locations, concepts, events, and the semantic relationships between them. You can visualize the graph interactively with 7 layout algorithms. Query modes include naive (fast lookup), local (entity-focused), global (full graph synthesis), hybrid, mix, and bypass. The graph grows smarter as you add more content. It is the same architecture used by Google Knowledge Graph, Meta's Social Graph, and Amazon's product graph — now available for personal use.
MIND integrates every major AI model in a single interface with token-based pricing. Switch models mid-conversation. Use the right model for the right task without managing multiple subscriptions or API keys. Supported models include:
MIND Agent is an AI that doesn't just answer questions — it manages your entire knowledge base, takes action on your behalf, and creates content, all from a single natural language message. 45 tools across three tiers:
MIND runs 8 pattern detectors across your knowledge base every day — automatically, without you asking. It surfaces insights you'd never notice on your own:
Generate rich media content — grounded in your personal knowledge graph — directly inside your AI chat. No switching apps. No losing context.
Build AI applications on top of your personal knowledge graph. The MIND Developer API provides RESTful endpoints for document ingestion, knowledge graph querying, and AI model routing. Supports webhooks for async processing. Available on Professional plan and above.
MIND connects to your digital life. Calendar integration (Google Calendar, Outlook). CRM for managing contacts and relationships. Task management with AI-generated action plans. Goal tracking with life projects and AI milestones. All connected to your knowledge graph.
Communities: create and join topic-based knowledge communities. Share insights from your knowledge graph. Featured Minds: curated public knowledge graphs from experts. AI-generated thought cards based on your knowledge surfaced in your feed.
One question sorts the whole field: can Claude read it? Can ChatGPT? Most second brain apps are brilliant at getting things in and locked shut on the way out — your knowledge lives inside their app, and the AI you actually use all day can't see any of it. Details below are from public sources and change; each linked page carries the full side-by-side.
There is a second category worth naming: developer memory layers such as Mem0, Zep, and Letta. Those are libraries for people building agents — real, serious infrastructure, and not something a person opens in the morning. MIND is the only one that is both the second brain you live in and the memory layer your agents read from. See every comparison.
Create a free account at m-i-n-d.ai. No credit card required. Upload your first document. Ask MIND anything about it. Watch the knowledge graph grow. Start free, upgrade when you're ready.
MIND app is built by Astra AI, founded by Anthony Conti. Astra AI is building the infrastructure for personal AI — starting with MIND, the first personal knowledge operating system built on a true knowledge graph. Website: m-i-n-d.ai. Contact: support@theastraway.com.