SecondBrain

Feed it what you read and think. It builds you a private, organised wiki
  you can ask questions, and every answer comes with its sources.

  Get started ↓  · 
  Using it  · 
  CLI  · 
  Engines

What it is

A knowledge base that lives in a folder on your computer. You do three things:

- Import anything — a note, a PDF, a web page, a slide deck, a spreadsheet, an image.
- It organises — everything gets folded into a cross-linked wiki, automatically.
- Ask — natural-language questions, answered from *your* material, with sources.

It runs through an AI agent you already have: Claude Code by default (also Codex or OpenCode). Everything stays in your folder; the only thing that leaves your machine is the text your agent sends its model to do the organising and answering.

Get started

No need to know your way around GitHub. Your agent does the setup for you.

1. Get the files. Open your favourite agent (Claude Code, Codex or OpenCode) and paste this in:

2. Set it up. Reopen your agent in that new SecondBrain folder, then paste:

It asks a couple of questions about your interests, writes your config, and you're done. *(Not sure how to reopen your agent in the folder? Just ask it: "how do I reopen you inside the SecondBrain folder?")*

3. Get the app.

  ⬇ Download SecondBrain.app

Just download it and drag it into your Applications folder. Launch it, point it at your SecondBrain folder, and it runs everything for you: no terminal, no restart juggling. Now just import something, click Update wiki, and ask a question.

Using it

The everyday loop, all from the dashboard:

- Capture — paste a Markdown note, drop or pick a file (PDF, PowerPoint, Word, Excel, CSV, image, text), import from a URL, or pull a document from Craft. Office and CSV…