Brains

Brains are personal knowledge collections. When you add content to a Brain, your companion can reference it when answering questions, drafting content, or helping you think through problems.

Creating a Brain

Open Brains from the sidebar and tap +. A new Brain is created immediately with a default title. Tap the title to rename it.

Your companion auto-generates a description for the Brain after you add content — you don’t need to write one yourself.

What you can add

Documents — Upload files directly into the Brain. Supported formats:

.pdf .epub .docx .doc .txt .md .csv .rtf .vtt .srt

You can also paste text directly without uploading a file.

Notes — Link existing notes from your Notes app into the Brain.

Pages — Link pages you’ve written in the Pages app into the Brain.

Size tiers

When creating a Brain, you can set a size tier that determines how much content it can hold:

Tier	Use case
Focused	Tightly scoped topic — a single project, person, or concept
Standard	General-purpose knowledge collection (default)
Deep	Large or comprehensive knowledge base

How your companion uses Brains

When you’re in a conversation, your companion checks your Brains to see if any are relevant to what you’re discussing. If so, it pulls in that content as context — you don’t need to reference the Brain by name.

You can also mention a Brain explicitly:

“Based on my Marketing Brain, what should I prioritise this week?”

Archiving Brains

You can archive a Brain you no longer need. Archived Brains don’t appear in the active list but aren’t deleted.