Second Brain

You use Claude for some things, ChatGPT for others, Cursor for code. But your context — your projects, decisions, preferences — doesn’t move with you. You re-explain yourself constantly.

Second Brain fixes that. One shared memory, available in every AI tool you use.

And unlike the built-in memory inside any single app, this one is yours. It lives in your own account. No platform controls it, and no platform can take it away.

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How it works

Connect Second Brain to whichever AI tools you use. Then tell it things once. It finds them later by meaning, so asking “what did I decide about the pricing model?” surfaces the right note even if you never used those exact words when you saved it.

Tool	What it does
remember	Store anything: ideas, decisions, project context
append	Add updates to an existing entry without creating duplicates
recall	Finds memories by meaning, not exact wording
list_recent	Browse recent memories by date
forget	Delete an entry

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Save from anywhere

Memory is only useful if it actually gets filled. Second Brain connects to the tools and moments where context naturally lives.

• Obsidian -- notes sync automatically via the community plugin
• iOS -- Brain Dump, Text Brain Dump, and Save to Brain shortcuts in one tap
• Browser -- bookmarklet saves any page or selection instantly
• Any AI client -- use remember mid-conversation, right when something matters

You can also remove the integrations section at the bottom since this replaces it.

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Setup

Before you deploy: You’ll be asked to set an AUTH_TOKEN. This is the password your AI clients use to connect.

Quick option: Use a memorable phrase like coffee-lover-2026

Secure option: Run openssl rand -base64 32 in your terminal and paste the result

Save it. You’ll need it in the next step.

1. Click Deploy — everything provisions automatically
2. Set your token — you’ll be prompted during deploy
3. Connect your AI tools — instructions here

That’s it. Your memory is live and ready across every tool you connect.

# Verify it's working (replace with your worker URL and token)
curl -X POST https://<your-worker-url>/capture \
  -H "Authorization: Bearer coffee-lover-2026" \
  -H "Content-Type: application/json" \
  -d '{"content": "second brain is working", "source": "test"}'
# → {"ok":true,"id":"..."}

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Documentation

• Setup Guide — deploy, token setup, connecting AI clients
• How It Works — semantic search, chunking, duplicate detection
• Connect to AI Clients — Claude Desktop, Claude Code, claude.ai, iOS
• Capture from Anywhere — browser bookmarklet, iOS Shortcuts, share sheet
• Web UI — dashboard and mobile interface
• Obsidian Plugin — install, configure, sync modes
• API Reference — /capture, /list, /mcp endpoints

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Integrations

• Obsidian — second-brain-obsidian-plugin · available in Obsidian Community Plugins
• iOS — Brain Dump, Text Brain Dump, and Save to Brain shortcuts in integrations/ios-shortcuts/
• Browser — bookmarklet in integrations/bookmarklet.js

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Stack

Cloudflare Workers · D1 SQLite · Vectorize · Workers AI · MCP TypeScript SDK · MIT License

All free tier at personal scale. Your data stays in your own Cloudflare account.

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MIT License · Discussions