ChatAtlas Local

Your ChatGPT and Claude chats, searchable on your own computer.
Ask Claude about them. Nothing leaves your machine.

You've had hundreds of conversations with AI assistants. The good answers, the decisions, the half-finished plans are scattered across ChatGPT and Claude, and their own search barely helps.

ChatAtlas Local takes the data exports both of them already give you and keeps every chat in one file on your computer. Then you can:

• Search everything at once, from the terminal or in your browser.
• Ask Claude about it: "what did ChatGPT tell me about my sourdough starter?" or "find the chat where I planned the garden beds." Claude Desktop, Claude Code, Cursor, VS Code and others can read your archive through MCP.
• Keep it forever, as plain Markdown files or a backup, whatever happens to the apps.

No account, no server, no telemetry. It never connects to the internet.

Get started

You need Node.js 22.16 or newer (or 24). Then:

npm install -g chatatlas-local

_{Before the first npm release, install it straight from GitHub: npm install -g github:hnt504/chatatlas-local}

1. Ask for your exports

• ChatGPT: Settings → Data controls → Export data. You get an email with a link to a .zip.
• Claude: Settings → Privacy → Export data. Same idea: an email, then a .zip.

2. Bring them in

chatatlas-local import ~/Downloads/<your ChatGPT export>.zip ~/Downloads/<your Claude export>.zip

✓ 6720ab…-2026-10-21.zip: ChatGPT, 1,284 chats (1,284 new)
✓ data-2026-10-21.zip: Claude, 412 chats (412 new)

Do it again whenever you like with a newer export: new chats come in, changed ones update, nothing doubles up. Or let it happen by itself (see Exports folder).

One Claude chat, every branch. On claude.ai, Retry or editing a message hides the old reply behind a small version switcher, and the next sync of most tools keeps only what is on screen. To save a chat with all of its branches, open it in Chrome, press F12, choose Console, and paste:

(async () => {
  const id = location.pathname.match(/\/chat\/([0-9a-f-]+)/)[1];
  const [org] = await fetch('/api/organizations').then((r) => r.json());
  const chat = await fetch(`/api/organizations/${org.uuid}/chat_conversations/${id}?tree=True&rendering_mode=messages&render_all_tools=true`).then((r) => r.json());
  const a = Object.assign(document.createElement('a'), { href: URL.createObjectURL(new Blob([JSON.stringify(chat)])), download: `claude-${id}.json` });
  a.click();
})();

Then chatatlas-local import claude-<id>.json. The branch on screen comes first; each hidden branch follows it, opening with "Earlier version, hidden on claude.ai by a retry or an edit."

3. Look around

chatatlas-local search sourdough starter
chatatlas-local open            # the browser view in the screenshot above

Connect Claude (and friends)

Claude Desktop

Either download chatatlas-local-<version>.mcpb from the latest release and open it with Claude Desktop (it asks where your exports go; no term

... View full README on GitHub