Brash
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Download for macOS

The canvas your agents work on.

A native design tool for Mac. Claude Code and Codex design on the same canvas as you — real layers, every edit undoable, every file on your machine.

Download for macOSWindows & Linux — coming soon

Apple silicon · macOS 14 or later · Free while in preview

The Brash editor in dark mode: layers on the left, a checkout flow on the canvas with Claude's cursor on it, the inspector on the right and the agent bar below.Prototype mode: the cart and checkout screens joined by a flow, with the interaction inspector showing a click that navigates with a push transition.An agent working on the checkout screen, asking permission to export it, with Allow, Deny and Always allow above the agent bar.

Works with

Your agent, on your canvas.

Ask in the omnibar, or from Claude Code and Codex in your terminal. The agent works on the real document — frames, auto layout, components — and you watch every edit land.

An agent asks to export the checkout screen; the request sits just above the agent bar with Deny, Always allow and Allow.

  • Prompt from the canvas

    Select a frame, press ⌘K and say what you want.

  • Every edit is yours to undo

    Agents write to the same history you do, one step per edit.

  • Any MCP client

    Claude Code and Codex connect on first launch. Anything that speaks MCP can drive Brash.

Real designs, drawn in Brash.

Every picture on this page is a Brash document, rendered by Brash’s own engine.

Halo's website: Music that follows the light, with two phones showing the app.Halo, Now Playing: Afterglow by Mira Sol.Halo, Library: recently added albums with their artwork.Halo, Discover: the new album, mixes and moods.

Halo, a music app — designed in Brash by an agent, over MCP.

Posts, stories and banners.

Ask your agent for a launch campaign, then refine every frame on the canvas. Halo’s post, story and header were drawn in Brash.

An Instagram post announcing Afterglow, out Friday on Halo.A story: Afterglow by Mira Sol, with Listen now.A header: Music that follows the light, over a concert crowd with three album covers.

Post 1080 × 1080 · Story 1080 × 1920 · Header 1500 × 500

The design features you expect.

  • Auto layout

    Hug, fill and fixed sizing, gaps, padding and wrap.

  • Components

    Instances keep their overrides through every edit to the main.

  • Gradients

    Linear, radial, angular and mesh, with image fills and blend modes.

  • Prototypes

    Click, hover, press or wait; navigate, open overlays, scroll to.

  • Effects

    Drop and inner shadows, layer blur and background blur.

  • Pen and boolean

    Draw paths; union, subtract, intersect and exclude them.

  • Styles and themes

    Colour, text and effect styles; switch a document light or dark.

  • Export

    PNG, JPEG, WebP, PDF and HTML, at any scale.

  • Import

    Bring in .pen, SVG and images as layers you can edit.

Native, not a browser tab.

Brash is written in Rust and draws straight to the GPU through Metal. No web canvas, no Electron — the editor stays fast on documents the size of a real product.

  • 1.4 msmedian frame
  • 1.7 ms99th-percentile frame
  • 5,400layers in the test document

Your designs never leave your Mac.

Brash runs on your machine. Your agent talks to it locally, and a project is a folder of JSON you can diff, review and keep in git.

  • macOSApple silicon · AvailableDownload
  • WindowsComing soon
  • LinuxComing soon

Design with your agents.

Free while in preview. macOS now — Windows and Linux soon.

Download for macOS