Your external AI brain.

Easily shared context for you and your team. Capture once, then plan, brainstorm, and automate with your favorite AI tools.

Free to start · works with Claude, ChatGPT, Cursor, and Claude Code

The Cortex Brain — every note, file, clip, and saved chat in one searchable place.

Capture into one brain. Use it from your favorite AI tools.

Capture

One brain, everything in it.

Notes, files, chats, captures — saved as neurons, searchable by meaning.

The Cortex Brain view with notes, files, clips, and saved chats.
Use

Plan, brainstorm, automate.

Cortex plugs into Claude, ChatGPT, and Cursor over MCP — your favorite AI tools, grounded in your brain, with citations.

The Connect any AI page — one MCP endpoint for Claude, ChatGPT, Cursor, and more.
Projects

Neurons and skills, per project.

Set the active project and every AI gets the right context and skills by itself — no more pasting briefs into fresh chats.

Project scopes in Cortex, each with its own neurons and members.
Teams

Shared context for teams.

Invite your team and everyone’s AI works from the same brain.

A shared team brain in Cortex with members and team projects.

For teams

The context lives with the team, not in someone's head.

Give a team its own brain and everyone's AI starts from the same facts — the decisions, the rationale, the half-finished thinking. New joiners read themselves in instead of booking a week of catch-up calls.

  • One shared memory. Notes, documents and captures every member — and every connected AI — can search.
  • Visible momentum. A live feed of what changed, who changed it, and what got decided.
  • Chat where the work is. Each team and project has a room, so decisions land next to the context they belong to.
Start a team brain

Aurora Labs

t/aurora-labs · 6 members

OverviewContentBoardsChat
  • SSanne shared Q3 pricing rationale2m
  • EErik edited Onboarding decisions18m
  • MMara commented on Churn interview notes1h

Connect anything.

Cortex speaks MCP. Your favorite AI tools read and write your brain — and anything with an MCP server or API can plug in too.

ClaudeChatGPTCursorClaude CodeWindsurfVS Codeany MCP client

Connecting takes minutes — paste one URL or config snippet, done.

Connect your AI

Private by default.

Encrypted at rest and in transit
Never trains a model
Export everything, anytime
One-click delete
Read the security posture

Start free. Upgrade when you need to.

No card required. Trial any paid plan for 7 days — cancel anytime.

Free

0/mo
  • 25 personal neurons
  • Projects
  • 1 AI connection (MCP)
  • Join any team free
  • Starter AI credits
Start free
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Pro

19/mo
  • 7-day free trial — cancel anytime
  • Unlimited neurons
  • Unlimited AI connections
  • Git sync — every change commits
  • Priority embedding queue
  • 24× AI credits
Start free, upgrade in-app

Team

49/mo
  • 7-day free trial — cancel anytime
  • Everything in Pro
  • Team workspace with 5 members included
  • Extra members €7/mo each
  • Members join free — the team is their free zone
  • Priority support
Start free, upgrade in-app

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Give every AI you use one external brain.

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