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Second Brain

#3 Product of the Day on Product Hunt

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.

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| |update |Replace an entry's content entirely | |recall |Finds memories by meaning, not exact wording | |list_recent|Browse recent memories by date | |forget |Delete an entry |

Save from anywhere

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

• CLI -- brain remember, brain recall, and more from your terminal — npm install -g second-brain-cf-cli
• Obsidian -- notes sync automatically via the community plugin
• iOS -- Brain Dump, Text Brain Dump, and Save to Brain shortcuts in one tap
• Browser extension -- capture any page or highlighted text in one click via the Chrome extension
• Any AI client -- use remember mid-conversation, right when something matters

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":"..."}

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 extension, bookmarklet, iOS Shortcuts, share sheet
• Web UI — dashboard and mobile interface
• Obsidian Plugin — install, configure, sync modes
• API Reference — /capture, /append, /update, /list, /count, /tags, /stats, /chat, /mcp endpoints

Integrations

• CLI — npm install -g second-brain-cf-cli
• 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 extension — second-brain-browser-extension · capture pages and highlighted text from any tab
• Bookmarklet — lightweight option in integrations/bookmarklet.js

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.

MIT License · Discussions