live · portable · yours
cosmos

Your portable exocortex. One graph. Every agent.

how it works · privacy policy · terms

you people topics places observations

install

$ curl -fsSL https://cosmos.polarity-lab.com/install.sh | sh

or npm install -g @polarity-lab/cosmos-mcp

free. open source. works with Claude Code, Claude Desktop, Cursor, Codex, Zed, Continue. read what it does

brief

Every AI you use is keeping its own private model of you. Claude has one. ChatGPT has one. Cursor has one. They never talk to each other and they never travel with you. Cosmos is the one that does.

It is a knowledge graph that lives at your account, not at any individual app. Sign in once, paste one MCP key. Claude Code, Claude Desktop, Cursor, Codex, Zed, Continue, and any other MCP-capable client read and write to the same graph. When one agent notices something durable about you, it lands there. When you switch tools, the graph follows.

The graph fills from your conversations, not from a manual capture habit. One CLI call pulls your iMessage history (locally, from your own chat.db), resolves who you actually talk to via your AddressBook, runs the transcripts through the engine, and lands the people, the threads, and the durable observations into your graph. Notion and Obsidian connectors do the same for what you write down.

The portable artifact is a JSON file. You own it. You can take it elsewhere.

how a cosmos fills

day one

a fresh cosmos. nothing in it yet but you.

what you get with an account

Connectors hub

Add Claude Code, Cursor, Codex, Zed as MCP connectors. Each gets its own revocable key bound to your graph.

One graph, many sources

Live imports from iMessage (local, decoded from chat.db), browser history (Chrome + Firefox extension, MV3), Notion, Obsidian, ChatGPT memory, Claude memory. The MCP layer keeps every connected client writing into the same graph in real time.

Portable by file

Export your graph as a JSON file anytime. Yours. Take it elsewhere if you ever want to leave.

Organized around your life

Cosmos sorts what it knows into the areas of your life. Work, people, health, ideas, the places you move through. Your /me page is grouped that way, so it reads as a portrait of you.

cosmos draws cards from your graph

Once your graph has some shape, cosmos surfaces the clusters, the recurring people, and the observations it has formed. Each one becomes a card you can share. The examples below are illustrations.

cosmos noticed
you do your sharpest thinking in writing, and tend to talk yourself out of it later.
from your graph this week
a recurring thread
one question about your work keeps resurfacing, months apart, in different words.
seen across your notes and chats
people in your orbit
a small handful of people show up across almost everything you think about.
weighted by how often they come up

common questions

What is Cosmos?

Cosmos is a personal knowledge graph that lives at your account. Every MCP-capable AI client reads and writes the same graph, so what one tool notices about you is available to the others. The graph is yours. It exports as a single JSON file.

Which AI tools work with Cosmos?

Any client that speaks the Model Context Protocol. That includes Claude Code, Claude Desktop, Cursor, Codex, Zed, Continue, and the rest of the growing MCP ecosystem.

Where does my data actually live?

In your Cosmos account. The graph is not stored inside Claude, ChatGPT, Cursor, or any individual app. You sign in once, paste one MCP key into each client, and they all read and write the same graph.

Is Cosmos free?

Yes. Free to sign up, free to use the MCP gateway, free to export your graph. The cosmos-mcp client is open source, and ships on npm.

Can I leave with my graph?

Yes. Export your graph as a JSON file from your account at any time. It is the portable artifact. You can take it elsewhere whenever you want to.

How is Cosmos different from ChatGPT memory or Claude memory?

ChatGPT memory only lives inside ChatGPT. Claude memory only lives inside Claude. Cosmos lives at your account, between the agents. When you switch tools, the graph follows.

start

free · no invite

create your cosmos account

One account. The graph, the chat, the MCP connectors, the JSON export. All of it.
create account i already have one