You keep re-explaining
Same project, same background, typed out again for every new chat and every new tool.
Free desktop app · Mac, Windows & Linux
Tell one AI.
Tell one AI.
Every AI knows.
ContextOS is shared memory for the AI tools you already use. Make a decision in ChatGPT, and Claude, Cursor, Copilot and Gemini already know it — no copy‑paste, no re‑explaining. It runs on your computer, so your work stays yours.
- No account needed
- Runs on your computer
- Set up in about a minute
Stripe can’t pay out to our Canadian account. Let’s switch Tidepool to Paddle.
Makes sense — Paddle supports CAD payouts and handles sales tax for you.
Add checkout to the pricing page.
Briefed by ContextOS
Using Paddle — you switched from Stripe on Tuesday over Canadian payouts. Creating checkout/+page.svelte…
Works with the AI tools you already use
- ChatGPT
- Claude
- Cursor
- VS Code + Copilot
- Gemini CLI
- OpenAI Codex
- Claude Code
- Windsurf
- Zed
- Cline
- JetBrains AI
- Antigravity
- Copilot CLI
- Grok
The problem
Every AI you use starts from zero.
ChatGPT for thinking, Claude for writing, Cursor for code. Each one is a sealed room — the only thing that moves between them is whatever you remember to paste in.
Decisions get buried
Long chats hide what you actually decided. The AI can’t tell last week’s choice from the idea you killed.
Memory is locked in
Built-in AI memory only works inside the app that made it. None of them share — by design.
75–170hours a year
That’s how long it takes to re-explain your work to AI tools at 6–8 switches a day, 3–5 minutes each. At $100 an hour, $7,500–$17,000 a year of telling machines what you already told other machines.
How it works
Install it once. Then forget it’s there.
ContextOS runs quietly in the background. There’s no new chat app to learn — your AI tools just start showing up informed.
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01
Install the app
Download for Mac, Windows or Linux. No account. ContextOS finds the AI tools on your computer and plugs into each one through its built-in extension slot.
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02
Work the way you already do
As you chat and code, ContextOS picks out what matters — decisions, ideas you ruled out and why, constraints, next steps — and files them in a private memory on your computer.
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03
Every AI starts briefed
Open any connected AI and it already knows where things stand. Each one gets a short, current briefing — about 1,000 tokens, not 40,000 of old chat.
Live demo
See what your next AI actually receives.
A 40,000-token strategy chat goes in. A briefing tuned to the task comes out — decisions, rejections and constraints first, small talk gone.
compile(task, target, budget)
Why it works
Not a chat log. A ledger of what’s true.
Chat history records everything anyone said. ContextOS keeps track of what’s current, what changed, and why.
Knows what changed
You picked Stripe in February and switched to Paddle in June. ContextOS knows Paddle is current, since when, and why — and keeps Stripe as history instead of handing it to your next AI.
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Payments:
Stripesuperseded - Payments: Paddle current
Remembers what you ruled out
Rejected ideas — and the reasons — are the first thing summaries drop. ContextOS keeps them near the top, so no AI re-pitches what you already killed.
Private by default
Everything runs on your computer. Your memory lives in ~/.contextos and the app only talks to your own machine.
No AI reads your work to summarize it
ContextOS picks out decisions on your machine. It never ships your chats to a paid model API to do it.
See what you saved
A weekly report shows the tokens each app didn’t have to re-read.
Take it everywhere
Turn on end-to-end encrypted sync to share one memory across your computers — our servers only ever see ciphertext. Then connect Claude on the web and your phone with a one-time sign-in code.
Native to every tool
ContextOS plugs in through each tool’s own MCP, plugin or skill slot. Nothing to find in a marketplace.
Built-in memory vs ContextOS
Why not just use ChatGPT’s memory?
ChatGPT, Claude and Gemini all remember things now. But each one remembers only for itself — and is built to keep you there. Prefer to do it by hand? Read our guide to sharing context between AI tools.
Capability
Built-in AI memory
ContextOS
Works across ChatGPT, Claude, Cursor, VS Code, Gemini…
One app only
Every connected tool
Where your memory lives
The vendor’s servers
Your computer
Knows which decision is current
Mixed in with old chat
Tracks what changed and when
Keeps rejected ideas and the reasons
Rarely
Always
Delete everything
Per app, if offered
One click
Privacy
Your memory stays on your machine.
You are the customer, not the inventory. ContextOS is built so that keeping your work private is the default, not a setting.
Read the privacy policy-
Local first
Your memory is a database in
~/.contextos. The app only accepts connections from your own computer. -
No account required
Download and go. An account is only for optional sync and connecting Claude on the web.
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End-to-end encrypted sync
Sync is opt-in and encrypted with AES-256-GCM before it leaves your device. Your recovery key never does.
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Delete anything, anytime
Purge a source, a project or everything in one click — on this computer and every synced device.
FAQ
Questions, answered.
What exactly is ContextOS?
A free desktop app that gives all your AI tools one shared memory. It notices the decisions, constraints and next steps in the work you already do in tools like ChatGPT, Claude and Cursor, and hands every AI a short, current briefing so it can pick up where you left off.
Is it another AI chatbot?
No. You keep using the AI tools you already like. ContextOS sits underneath them so they share what they know about your work. It doesn’t replace any of them.
Which apps does it work with?
ChatGPT desktop and Codex, Claude Desktop and Claude Code, Cursor, VS Code with Copilot, Gemini CLI, Windsurf, Zed, Cline, JetBrains AI (Junie), Antigravity, Copilot CLI and Grok. A browser extension adds chatgpt.com, claude.ai, Gemini, Google AI Studio and grok.com when you switch those sites on.
Does my data leave my computer?
Not unless you choose. Your memory lives in a private database on your computer. If you turn on sync, it’s encrypted before it leaves and our servers only store ciphertext. If you connect Claude on the web, a cloud gateway decrypts your briefing in memory to answer Claude — disconnecting deletes its key.
Do I need an account?
No. The desktop app works on its own. An account is only needed for syncing between devices or connecting Claude on the web and mobile.
How is this different from pasting a summary?
Summaries go stale the moment you paste them, and they drop what you rejected. ContextOS updates continuously, tracks when a decision is replaced, and tunes each briefing to the task and the tool receiving it.
What’s MCP?
The Model Context Protocol — the open standard most AI apps use to plug in tools and data. ContextOS registers itself as an MCP server named contextos in each tool, alongside that tool’s own plugin or skill where it has one.
How much does it cost?
The desktop app is free to download and use on your computer.
Still stuck? Email support@contextos.ca with your OS and the app version from the desktop console — a human will get back to you.
Give every AI the same memory.
Free for Mac, Windows and Linux. Installs in about a minute. Open it and watch your tools turn green.
macOS
ContextOS.dmg
Universal (Apple Silicon and Intel), macOS 11+. Updating? Quit ContextOS from the menu bar extra first.
Download for MacWindows
ContextOS-Setup.exe
Windows 10 or 11, 64-bit. Signed installer. Re-run it any time to update in place.
Download for WindowsLinux
ContextOS.AppImage
x64 AppImage for Ubuntu 22.04+ or any glibc 2.35+ desktop.
Download for Linux