Build Apps and Games in the Playground Without Writing a Single Line of Code

The FastRouter text Playground now supports artifacts. Ask it to build something — a web page, a game, a dashboard, a calculator — and the result renders directly inside the Playground as a working, interactive output.

No copying code into a separate environment. No pasting into CodePen. The thing you asked for appears, and you can use it immediately.

What this looks like in practice

Ask the Playground to build a tic tac toe game. Within seconds, a playable tic tac toe game appears in the output panel. Click the squares. It works.

Ask for a simple expense tracker and get a form where you can add items, see totals, and delete entries. Ask for a landing page for a developer tool and get a rendered HTML page with layout, typography, and buttons.

Why this matters for product and engineering teams

For product managers, this means being able to prototype an idea in the Playground and show it to a team without involving an engineer. For engineers, it means evaluating whether a model actually produces working code without a manual round trip through a development environment.

Reading a code block and inferring whether it will work is unreliable. A layout bug caused by a flexbox issue is invisible in the source but immediately obvious when rendered. Artifacts make the output real, not theoretical.

Comparing models on what they actually build

Different models produce meaningfully different results on the same artifact prompt. One model might build a clean, functional interface. Another might add features nobody asked for. A third might produce code that looks tidy but breaks on render.

In the Playground, running the same prompt across multiple models shows these differences immediately in the rendered output — not in a code review, not in a staging environment, right there in the comparison view.

FastRouter's text Playground with artifact support is available now. Try it at FastRouter.ai.