Alloy — DevPost "About the project"
Inspiration
Every product team we've worked with has the same bottleneck: the gap between having an idea and having something clickable to test it with. Designers mock static screens, PMs write specs nobody reads, and engineers build the wrong thing before anyone realizes the flow doesn't work. We built Alloy because prototyping should take minutes, not sprints — and because AI has finally made that possible.
What it does
Alloy is an AI prototyping tool for product teams. Describe a feature in plain language, or capture an existing product with our Chrome extension, and Alloy generates a live, interactive prototype you can click through, share, and iterate on — no design tool learning curve.
Key capabilities:
- Clone any web page and prompt — turn a feature idea into a working interactive prototype in minutes
- Chrome extension capture — snapshot real product screens and remix them into new flows, so prototypes start from your actual UI instead of a blank canvas
- Design-to-code export — prototypes aren't dead ends; export clean code that engineers can take into real codebases
- Instant sharing — send a link and stakeholders can click through the prototype directly, which is how teams get alignment before a line of production code is written
Product managers use Alloy to pressure-test flows before writing specs. Designers use it to explore directions faster than static mockups allow. Founders use it to put something tangible in front of users and investors.
How we built it
Alloy is built on frontier LLMs orchestrated with a custom generation pipeline that produces real, structured UI code rather than images — which is what makes prototypes interactive and exportable. The Chrome extension does high-fidelity DOM capture so the AI works from your genuine product context. The stack is a modern TypeScript/React codebase with a small team of four shipping continuously.
Challenges we ran into
The hardest problem in AI prototyping isn't generating a screen — it's generating your screen. Getting capture reliability right across the messy reality of production web apps, and making AI edits respect an existing design system instead of hallucinating a new one, took far more iteration than the core generation loop.
Accomplishments that we're proud of
Alloy is backed by Y Combinator, Blackbird, and Bain Capital Ventures, and is used daily by product teams who've replaced their old mockup-first workflow with prototype-first. Our favorite signal: PMs sharing Alloy prototypes internally has become our strongest organic growth loop — the product spreads because the prototypes themselves are the pitch.
What we learned
Users don't want a "website builder" or a "design tool" — they want to prototype. The language teams actually use, in call after call, is "can I prototype this?" That insight shaped the entire product: Alloy is purpose-built for AI prototyping, not general-purpose site generation.
What's next for Alloy
Infinite canvas, better support for websites, a more intelligent agent, and a few things that are secret!
Try it at alloy.app — the fastest way for product teams to go from idea to interactive prototype.
