Try ten directions. Commit to one.
Your riskiest weeks are the ones spent building the wrong thing. On this canvas you describe an idea and get a working version in minutes, so you can put three takes in front of users tonight and commit with evidence. The agent you already subscribe to does the building.
Validate the day you have the idea
Describe the screen and a running version appears. What you learn is real because the prototype is.
Put three takes in front of users tonight
Branching costs a sentence. Keep the one people actually use.
Demo the product, not the deck
Investors and early users click a working slice, typed input and all.
No engineering hire to test demand
Claude Code, Codex, or Cursor builds on your canvas, on the subscription you already pay for.
The validated prototype becomes the product
Real React from day one. When something wins, you keep building on it instead of rebuilding it.
Frequently asked questions
- I have no technical cofounder. Can I use this?
- Yes. You describe what you want in plain language and steer by pointing at what comes back. The agent handles the code. Founders ship working slices here without writing any.
- Is the output real code or a demo toy?
- Real React, running in the browser. The code behind your prototype is the same code you would take to production, and you can hand it to an engineer or an agent to keep going.
- What does it cost to run the agent?
- Prototyper is free to start. The building is done by the agent subscription you already have, Claude Code, Codex, or Cursor, connected over MCP. No separate API bill.
See it with your own work
Free to start, no credit card. Bring the agent you already have.