Callosium

Every AI you use forgets you. Callosium gives them one shared memory, in plain files you own.

You explain your project to Claude. Then you explain it again to ChatGPT. Then again to Cursor. Every chat starts from zero, and everything you have ever told an AI is scattered across apps that do not talk to each other.

Callosium fixes that. It turns a folder of plain Markdown on your computer into a brain any AI can use: they recall what you know before answering, save what they learn in the right place, and cite exactly where every answer came from. Your files never leave your machine.

• One brain, every AI. Claude, Cursor, ChatGPT-compatible apps, 27 clients supported, all reading and writing the same memory.
• Plain files you own. Markdown on your disk. No database, no cloud, no account required. Uninstall tomorrow and your notes are still just notes.
• It does not make things up. Across 15,000 test questions it invented nothing. When the answer is not in your notes, it says so. (the numbers)
• Works offline, in English and Arabic. Everyday recall needs no internet, no API key, and no large language model.

Table of contents

• A guided tour
• Install and first run
• Connect your AI
• What your AI can do once connected
• Why it is different
• The proof
• White paper
• Your files, your storage
• Docs and policies

A guided tour

A walk through the local dashboard, shown on a dummy "Northwind Studio" brain (never real data).

1. Open it, and it works offline-first

2. Sign in, or stay fully local

Google, GitHub, email, or continue as guest. An account is only for syncing and paid plans; the free app never needs one, and your notes never leave the device either way.

3. The cockpit

Your brain at a glance: notes stored, connections, health, and a live feed of every change, human or AI.

4. Connect any AI, scoped to what you allow

Every AI you connect shares the same memory, and you decide what each one can reach.

Pick a client and Callosium hands it a scoped connection to paste into its settings. Nothing is sent anywhere.

5. Ask your brain, and it answers only from your notes

Every answer cites the exact notes it came from. If it is not in your brain, it says so instead of guessing.

6. Your notes, linked and versioned

Browse everything, follow the [[wikilinks]], and every note keeps a full version history one click from undo.

7. See the whole brain as a map

A constellation of everything you know, with the hubs to start from and every link between notes.

8. Keep it healthy

A one-click audit finds broken links, orphans, and gaps in your topic maps, and fixes only what you approve. Nothing changes on its own.

9. Privacy and honesty are on by default

Local-only, per-AI permissions, signed writes, always-cite, never-invent, bilingual, and a one-click export of every note. The guarantees are built into the engine, not switches you can forget to set.

Install and first run

Prerequisite: Node.js 20 or newer. Check with node --version.

1. Install it, then run one word

npm install -g callosium

callosium

That is the whole setup. callosium on its own opens the dashboard at **http://localhost:431

... View full README on GitHub