Your Digital Second Brain

Notes, calendar, tasks, budgets, trips and media in one connected, searchable place. Free, private, and ready for your AI assistant.

  • Free for everyone
  • English & Italian
  • Works with AI (MCP)

Everything in one place

The Second Brain brings your notes, plans, money and media together — connected, searchable and entirely yours.

Notes & knowledge base

Capture notes, recipes, places, bookmarks and more, all linked together in one searchable knowledge base.

Learn more

Calendar & planning

Plan your days, track tasks and keep events and routines organized on a calendar built around how you think.

Learn more

Cashflow & budgets

Log payments, set budgets and keep an eye on subscriptions so you always know where your money goes.

Learn more

Trips & wishlists

Plan trips, build wishlists and keep the things you want to do and buy in one tidy list.

Media tracking

Follow YouTube channels, Twitch streams and RSS feeds so the content you care about comes to you.

Tags & knowledge graph

Connect everything with tags and explore how your notes and entities relate through a visual graph.

Works with your AI assistant (MCP)

The Second Brain has its own MCP server. Connect Claude Code, Codex, Cursor, Gemini CLI, OpenCode or any other MCP client, and your AI can search and read your notes, tasks and plans — and, if you allow it, add and update them for you.

  • Create a personal token in your profile, under AI access (MCP), and follow the built-in setup guide.
  • Choose what the AI can do: read only, read and write, or read, write and delete.
  • Your data stays yours: each token sees only your account, and you can revoke it at any time.
How the MCP server works

For example, connect Claude Code with one command:

claude mcp add --transport http second-brain https://api.the-second-brain.com/mcp --header "Authorization: Bearer YOUR_TOKEN"
  • Claude Code
  • Codex
  • Cursor
  • Gemini CLI
  • OpenCode

How it works

  1. 1

    Sign up for free

    Create your account with your email address and confirm it. No invitation needed.

  2. 2

    Capture and connect

    Add notes, tasks, payments and places, then tag and link them so everything is easy to find again.

  3. 3

    Bring your AI

    Connect your AI assistant over MCP and let it search, read and update your second brain for you.

Frequently asked questions

What is The Second Brain?
The Second Brain is a web app for building your own digital second brain: one private place for your notes, calendar, tasks, budgets, trips and media, all linked together and searchable.
What is a second brain app?
A second brain app keeps what you know and what you plan outside your head, so you can find it again when you need it. The Second Brain goes beyond notes: it also holds your schedule, your money and the content you follow.
How is it different from a notes app?
Notes, events, payments, places and people live in the same app. You can tag and link them to each other and see how they relate on a knowledge graph, instead of jumping between several apps.
Does it work on my phone?
Yes. It runs in any modern browser, and you can install it on your phone or computer like an app.
Is it available in Italian?
Yes. The interface is in English and Italian. You can switch language from the footer.
Is it free? How do I start?
Yes, it's free. Click Sign up, create your account with your email address and confirm it. No invitation needed.
Can I connect it to an AI assistant?
Yes. The Second Brain includes an MCP server (Model Context Protocol, the open standard AI assistants use to work with other apps). Create a token in your profile under AI access (MCP) and connect Claude Code, Codex, Cursor, Gemini CLI or OpenCode.

Start building your second brain

Free for everyone, in English and Italian, on your phone and your computer.