Give Claude a place to design.

What Claude is genuinely good at

Credit first, because it is the reason this page exists. Claude's current models are unusually strong interface designers. Given a decent brief they produce layouts with sensible hierarchy, real spacing logic, and code quality that passes review: working React and Tailwind rather than approximations of it. They hold a design system in context and apply it consistently across screens. They take critique well, in the sense that a specific note usually produces a specific fix instead of a full rewrite.

None of that is our product. It is Anthropic's, and it would be strange to pretend otherwise. Prototyper's position is simpler: if the model is this good at design, the bottleneck has moved to the environment around it, and that environment is what we build.

What a transcript costs you

A chat window was never designed to be a design studio, and three frictions show up as soon as you use it as one.

The first is that designs scroll. Version three of your dashboard lives forty messages above version seven, and comparing them means scrolling, re-generating, or keeping screenshots in a folder. Spatial tools solved this decades ago: put the versions next to each other and look.

The second is steering by paragraph. When the only channel is text, “make the sidebar feel lighter” requires you to describe, in words, which sidebar, on which screen, in which version. Every correction re-pays context that a shared surface would hold for free. Pointing is the older and better interface for “this one, right here.”

The third is that a transcript is single-player. Design decisions are made by teams, and pasting screenshots of Claude output into Slack for opinions is not review, it is telephone.

There is also the matter of cost. Iterating on designs through metered API calls adds up quickly, which anyone who has run a long design loop against a per-token meter knows. Prototyper takes no position on your model bill because it does not have one: you bring your own agent, and Claude Code runs on the Claude subscription you already pay for. The canvas is the product; the model stays yours.

How designing with Claude works on the canvas

Here is the loop, end to end.

1. 01

   Connect Claude Code.

   One command registers Prototyper as an MCP server in Claude Code. The docs walk through it in about two minutes, and nothing about your Claude setup changes otherwise.

2. 02

   Give it the brief where it works.

   Drop your notes, references, and rough sketches on the canvas. Claude reads the surface, so the brief does not have to be re-typed into a prompt; it is already in the room.

3. 03

   Watch the design arrive running.

   Claude builds real components in a window on the canvas. Not a mockup of a settings page: a settings page, with a live preview you can click, type into, and resize while it is still being built.

4. 04

   Steer by pointing.

   Select the header that feels wrong. Leave a sticky note on the empty state. Claude sees the same surface you do, so “this one, smaller” finally works as an instruction. When words are still the right channel, the design prompting guides cover how to brief a model well.

5. 05

   Explore in parallel.

   Ask for three directions on the same screen and Claude lays them out side by side. Comparing beats remembering, and discarding a direction costs nothing.

6. 06

   Bring the team in.

   The canvas is multiplayer and viewers are always free. Your PM comments on the running screen, not on a screenshot of one, and the whole roster of agents can share the surface if your team uses more than one.

The result runs, which changes what a design review is. Instead of imagining how the mockup would behave, your team operates the actual screen and argues about real behavior. When the design wins the argument, there is no handoff. The React that Claude wrote on the canvas is the code you take toward production, the same pipeline described on our AI prototyping tool page.

Chat and canvas, honestly compared

The chat window is not a mistake. For a quick one-off component, a code question, or work that never needs a second pair of eyes, a transcript is a perfectly good place to meet Claude, and it requires zero setup. The canvas earns its keep when design becomes iterative, comparative, or collaborative, which describes most real product work.

If you sketch structure before asking for screens, the same canvas covers that end too: the AI wireframe generator workflow feeds directly into a Claude build.

Frequently asked questions

Can Claude design UI?

Yes, unusually well. Claude models produce strong layout decisions and clean, working interface code. What a chat window cannot give them is a place to run that code and a way for you to steer visually, which is what the canvas adds.

How do I connect Claude Code to Prototyper?

One command adds Prototyper as an MCP server to Claude Code. The docs walk through it in about two minutes, and your existing Claude Code setup is otherwise untouched.

Does this use my Claude subscription or a separate API key?

Your subscription. Prototyper is bring-your-own-agent: Claude Code connects over MCP and works on the plan you already pay for. Prototyper is the workspace, not the model.

Is Prototyper affiliated with Anthropic?

No. Prototyper is an independent product that works with Claude through MCP, an open protocol. Claude is a trademark of Anthropic, and we are not affiliated with or endorsed by them.

Can I use agents other than Claude?

Yes. Codex, Cursor, and Copilot connect the same way, and different teammates can bring different agents to the same canvas. This page is about Claude because Claude is exceptional at design work.

What happens to the designs Claude makes?

They stay on the canvas as running React apps, alongside the briefs and sketches that produced them. That is the quiet upside of Claude design work on a real surface: because the design is real code, taking it to production is a continuation, not a rebuild.