A free, private place for everything you want to remember — organized for you by an AI you already have (like ChatGPT or Claude). Drop your files in; it sorts them and learns who you are. Nothing leaves your machine unless you say so.
Free & open source. You'll need one free tool that can open a folder for you — Codex (from OpenAI / ChatGPT) or Claude (Claude Code or Claude Desktop). That's the only requirement.
Drop bank statements, notes, receipts, PDFs — anything — into one inbox, say "sort my inbox," and your brain files it all into sensible areas it names for you. It never deletes or changes your files; it just puts them where they go.
It answers questions from your own documents — "when's my car insurance due?", "what did I spend on the trip?" — from files on your computer, not the web.
A little local dashboard shows what your brain knows and how it's organized. It only opens on your own machine. Nothing here phones home.
Grab the download for your OS and run it — the guide shows every click for Mac, Windows, and Linux. Your My Second Brain (Zuzora) folder appears in your home, and a small icon appears in your menu bar or taskbar. No setup, nothing to configure.
Open Codex (or Claude) and choose Open Folder — then select your “My Second Brain (Zuzora)” folder, so it knows what to work on. Say hi: it introduces itself, asks a few quick questions, and you're set.
Put a pile of files in the inbox and say "sort my inbox." Watch it organize everything — and tell you one true thing it noticed about you. The more you use it, the more it knows; give it about a week of daily use and it really starts to feel like yours.
Everything stays on this computer.
Your brain never sends anything out unless you ask. Only items you choose to mark Shareable can ever leave.
It works for you. Read, move, or delete anything by hand. To uninstall, delete the folder. No account to close.
When you choose to, your brain can join the Zuzora lattice — an opt-in network that quietly matches you to opportunities, without revealing who you are until you both choose to. Your identity is created on your own device, and your private key goes into your operating system's keychain.
Only what you mark Shareable is ever shared — everything else stays put. You can disconnect any time. Off by default.
Because this is a free download from a small team, your OS may show a caution the first time — standard for new apps, not a sign anything is wrong. It's open source — the full code opens to the public soon, so you'll be able to read every line yourself.
If you see "can't be opened," right-click the app → Open → Open. You only do this once.
Unzip the download (right-click → Extract All…), then double-click Install Second Brain. If Windows asks to confirm, choose Run (or More info → Run anyway).
No prompts here — just a short terminal step: unzip the download and run bash install.sh. The guide has the exact lines to paste.