Your design runs.
You already know what the screen should be. On this canvas your sketch becomes the working interface, with an agent doing the construction while you keep the taste. No handoff, no redline document, no waiting for eng to interpret you.
Sketch the way you think
Boxes, stickies, arrows. The agent reads your structure and builds from it.
Critique a running screen, not a picture
Spacing, motion, and states are real from the first draft. Your eye works on the actual thing.
Keep the pixels yours
Select any element and adjust type, color, and spacing directly. The code follows your changes.
Handoff stops existing
The artifact you designed is the artifact that ships. Nothing gets re-interpreted on the way to production.
Your team sees what you see
Multiplayer canvas, comments as stickies, viewers free. The review happens on the work itself.
The week this replaces
Count where a product designer’s hours actually go. A morning renaming layers and rebuilding a component set because the primary button changed. An afternoon writing redline annotations so engineering knows the spacing you already set. A handoff meeting, then days of Slack threads answering questions the mockup cannot answer for itself. Then the long tail: the build comes back weeks later, close but not right, and you file visual bugs against your own design.
Little of that is design. It is the overhead of working in a tool whose output is a picture. A picture has to be described, interpreted, and rebuilt before anyone can use it, and each of those steps loses information you placed deliberately. The rebuild gap between your file and the shipped screen is where your best decisions quietly die.
The same work, on a canvas that runs
Here is the loop in Prototyper. You sketch the screen the way you would on a whiteboard: boxes, labels, arrows, a sticky that says what the screen is for. An agent reads that structure and builds it as a real interface, live on the same canvas. Not an image of a checkout page. A checkout page, with focus states, validation, and motion you can feel under the cursor.
From there you work the way you already work. Select an element and change the type scale. Tighten the spacing. Swap the accent. The code follows your changes, so the thing you polished is the thing that exists. When it looks right you share a link, and your team reviews the running screen instead of a static export of it.
The handoff meeting does not get shorter. It goes away. There is nothing to hand off, because the artifact you designed is already the artifact engineering would have spent the next month rebuilding.
Built for taste, not for syntax
You do not write code here, and the point is not to teach you. You direct with sketches, selections, and plain words. The agent you connect, whether that is Claude Code, Codex, Cursor, or Copilot, does the construction on the subscription you already pay for. Your job stays what it always was: knowing what good looks like, and saying no until the screen gets there.
Your design system comes with you. Tokens and components live in the workspace, the agent composes with them, and output lands looking like your product rather than a template. Designers who read code can open any file and see exactly what their decisions became. Nothing requires it.
Where you will spend your time
Sketches, stickies, briefs, and running apps on one spatial surface.
Live previewEvery screen runs while you shape it. Critique the real thing from the first draft.
AgentsBring your own agent and direct it like a very fast, very literal builder.
CollaborationMultiplayer canvas, comments as stickies, free viewer seats for reviews.
When Prototyper is not your tool yet
Honesty helps you plan, so here is the line as it stands today. Brand work, illustration, print, and deep vector editing belong in a vector tool, and Prototyper does not try to be one. Org-scale static design libraries with thousands of documented components are still easier to govern in Figma.
The pattern that works: product screens and flows move here, brand and visual exploration stay where they live now, and the two meet when the agent composes your real tokens into running screens.
Frequently asked questions
- Do I need to code?
- No. You direct with sketches, selections, and words; the agent writes the code. Designers who read code can open it, but nothing requires it.
- Can I use my own design system?
- Yes. Bring tokens and components into the workspace and the agent composes with them, so output matches what your product already looks like.
- What happens to my Figma workflow?
- Many teams keep Figma for brand and explorations and move product screens here, where the prototype is the product. Nothing forces a switch on day one.
- What code does it produce?
- React and Tailwind, running in the browser while you design. It is the same kind of code your engineering team writes, so what leaves the canvas is a codebase, not an export that needs translation.
- Which agents can I bring?
- Claude Code, Codex, Cursor, or Copilot, connected over MCP on the subscription you already have. Prototyper is the workspace; the agent is yours.
See it with your own work.
Free to start, no credit card. Bring the agent you already have.