Feature

Diagrams, callouts, footnotes and math: notes that make things clear

Matt CatonNov 10, 2026

A good note does more than hold information: it gives it context and makes it clear. Callouts, diagrams, footnotes and math help your notes do just that.

Callouts

Set the important parts apart: a tip, a warning, a question that’s still open. There are 13 kinds, each with its own color and icon, and you can restyle any of them in your theme.

$A Tip callout: Lead with the customer quote. It tested best in every Northstar interview.$ $A Warning callout: Hold the launch if anything is unchecked.$ $A Question callout: Extend the Brightline pilot?$

Diagrams

Describe a diagram in a few lines of text, or start from one of 18 templates, and TheBrain draws it. The drawing updates as you type, and its colors follow your theme.

A sankey diagram in a TheBrain note — Six of the 18 kinds of diagram you can start from.

A user journey diagram in a TheBrain note — Six of the 18 kinds of diagram you can start from.

Footnotes

Keep your sources close. Hover over a mark to read its note without losing your place. Footnotes are saved in standard Markdown, so they read correctly in other Markdown tools too.

$A list in a TheBrain note whose items end with the footnote marks survey, cookies and reviews.$

Math

When the numbers matter, type $$ and write the formula in LaTeX. A live preview shows the result as you type.

$A formula in a TheBrain note: contribution margin equals revenue minus direct cost minus labor, over revenue, times 100%.$

Callouts, diagrams, footnotes and math are in TheBrain 15 for Windows, Mac, Linux, the web, iPhone, iPad and Android. Diagrams and footnotes need a brain that saves its notes as standard Markdown: switch it in Settings › Brain › Content Settings › Note Format.

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