You are reading a Mermaid diagram
as source code.

FlowPeek draws it where you already are — a docs page, a pull request, your editor.

A macOS menu-bar app. Free, open source, and it draws without sending anything anywhere.

Download for macOS Watch the tour Source on GitHub

brew install --cask flowpeek/tap/flowpeek

Thirty-seven seconds, four ways in, no narration. Nothing here is a mockup.

More ways in

Drag over it

Select Mermaid in any app and a small button appears beside the selection.

Mermaid source dragged over on a documentation page; a FlowPeek button appears at the end of the selection and opens the diagram

Point at it

Hold Option and move the pointer. The block is outlined where it sits; Space draws it.

Option held over a Mermaid code block on a documentation page: the block is outlined, and pressing Space draws the diagram

Copy it

A badge appears near the menu bar and names the key that opens it.

A badge sliding in below the menu bar reading Mermaid, sequenceDiagram, Press to preview

Print it in a terminal

A diagram in Terminal, iTerm2 or Ghostty gets a faint frame where it sits — printed at the prompt, or inside a full-screen program like vim or a coding agent. The pointer brightens it; hold Option and the block opens on a click.

A fenced mermaid block printed in Terminal gets a faint frame around it; the pointer arrives and the frame brightens with a label reading flowchart, Option-click, and the diagram opens in its place

Editors, too

A fenced mermaid block in VS Code outlined by FlowPeek, then drawn in the preview — In VS Code the outline follows the caret, because an editor can say where the caret is but not where the pointer is.

In Finder

Come back to one

A shelf of remembered diagrams rising from the bottom of the screen, filtered by typing, then walked through with the arrow keys — Every diagram FlowPeek draws is kept, as a picture. ⌥⇧⌘H raises the shelf with the search field ready; the arrows, Return, ⌘C and Delete do the rest.

What it does not do

No network. Mermaid is bundled, so drawing a diagram makes no request at all.
No logging. The text you point at, and the terminal buffer around a diagram on screen, are read into memory and never written down. The diagrams it actually draws are kept on your Mac so the shelf can offer them back — capped by count, by age, or switched off entirely.
One permission. Accessibility, because reading the text you are pointing at is the whole feature. Say no and copying still works; the app says so instead of pretending to be broken.
No account, no telemetry, no upsell. MIT licensed.