Rent the model.
Own the brain.

Second Brain OS is a portable, file-based AI workspace FCT installs around your business. Instead of being the model, your assistant is a folder of plain files on your machine — Markdown, structured data, and scripts — that holds who you are, your business context, a memory of everything you have done, and the skills and tools to act on it. A capable AI model like Claude plugs in to supply the thinking, and for that session it becomes your assistant; swap in a sharper model next year and the brain stays exactly where you left it. The workspace is organized into clear folders: identity, context, workspace, memory, skills, setup, automations, and database. Base setup usually completes in one to two weeks. The intelligence is the only interchangeable part — everything that makes the assistant yours lives in files you own and keep, not a chat thread that disappears when the session ends.

Second Brain OS differs from ChatGPT or Claude by separating the intelligence from the brain. Most AI tools are the model: when the chat ends the context is gone, and when you switch providers you start over, renting the intelligence while owning nothing you built. Second Brain OS inverts that. A single provider-agnostic startup file tells any model — Claude, Codex, GPT, or whatever comes next — how to wake up as your assistant, with all of its memory and skills intact. No vendor is load-bearing and no account holds your data hostage. Underneath runs a memory system on two layers: durable facts injected at every session start, and daily logs built automatically from your transcripts, so the assistant reads back the whole arc instead of waking up blank. A weekly synthesis pass keeps that memory clean and current. You rent the thinking; you own the brain, as files on your own machine.

You own every file in the workspace from day one. Second Brain OS lives as plain files on your own machine — identity, context, memory, skills, automations, and more — and FCT's contribution is the framework, the setup, and the tool wiring, not the content. Move the folder to a new machine, hand it to a different model, or read it yourself ten years from now and it all still works. It runs on your own AI runtime, Claude Code or Codex, which needs a paid account starting around 20 dollars a month; you own that account and pay the provider directly, while FCT recommends one and sets it up during onboarding. Day to day you just open the folder and talk to your assistant. It works on Windows and Mac. Handoff includes documentation of what each folder does and how to extend it, plus an optional retainer for upkeep, drift prevention, and ongoing improvement.

Second Brain OS memory works on two layers so the assistant never resets between sessions. The first layer is durable facts injected at every session start — the things that should always be true in context. The second is daily logs built automatically from your session transcripts: a searchable record of everything that got built, decided, and why. Start a fresh session and the assistant reads back the whole arc instead of beginning blank. A weekly synthesis pass keeps the memory clean and ages stale, time-anchored facts to current reality, so the assistant does not silently go out of date — the same self-freshening shape the major AI labs now tout as background memory, but delivered as portable files you own and any model can read. On top of that, a growth loop reads your recent logs, finds the workflows you repeat, and surfaces them as new skill candidates you approve. The longer you run it, the more it knows you.

Base setup of Second Brain OS usually completes in one to two weeks, with add-ons extending the timeline based on scope. Setup runs in five steps: FCT clones the template into your workspace folder, a guided onboarding skill interviews you to fill in identity, plan, memory, and business context and names your assistant, FCT wires the tools you live in — Apple, Google Workspace, Telegram, Cloudflare, GitHub, MCP servers — optional add-ons or automations are layered on, and FCT verifies startup context, memory writes, and at least one skill-backed tool before handoff. Three add-ons are available: Accounting, which tracks receipts, expenses, contributions, withdrawals, and subscriptions through Google Workspace; Coding, which adds a projects folder, repo conventions, and build, test, and release patterns; and Business Integration, which adds company context, products and services, and a revenue-framing plan for owners running a business with clients. Each can be bought upfront or added later.