Luka Kankaras
Product, Storylane
Alloy gives me fast prototypes that look exactly like my product - that's the big differentiator. My team instantly gets what I mean.
Prototype with your design system
Upload your codebase folder. Alloy extracts your components, tokens, and icons so every prototype is built from the system you already ship.
Free to start · Works with React, Vue, Svelte, and plain HTML & CSS
From folder to component library
No token pipelines, no registries, no plugin setup — the source code you already have is the integration.
1
Upload your folder
Point Alloy at your design-system or app folder. Files upload straight from your browser — no repository access or token export pipeline required.
2
Alloy learns your system
An AI agent reads the source and builds a library: every component with its real code and styles, your design tokens as ready-to-use CSS, your icons, and brand assets.
3
Prototype with real components
Start a session with the library attached. The AI reuses your actual components instead of inventing lookalikes, and you can @-mention any component to drop it into a prototype.
Everything your system contains, extracted
The analysis is exhaustive by design — a library holds the parts of your design system that matter when building new UI.
Components
Every public component, registered with its real source, co-located styles, and usage notes — plus a live preview card.
Design tokens
Colors, typography, spacing, and font faces extracted as ready-to-use CSS, so new UI starts from your values, not approximations.
Icons
Your full icon set, browsable by you and searchable by the AI while it designs.
Guidance
Conventions distilled from your code into instructions the AI follows whenever it builds something new.
Brand assets
Logos, wordmarks, and fonts carried over pixel-identical — nothing re-rendered.
Trusted by teams whose prototypes have to look like production.
Caden Ulanet
Product, Humanaut Health
With other tools, users would get lost. Alloy lets me prototype inside an interface that already feels familiar to them.
Caroline Gao
Director of Product, Pragma
Other tools rebuild your product from scratch and often get it wrong. With Alloy you capture the page and go. I use it almost every day.
Alejandro Alonso
Product Designer, CompanyCam
The Chrome extension gives me really high-fidelity screens - I never get that level of fidelity in other platforms. I hand them straight to engineers.
Ghadeer Essa
Product Designer, Contract
Alloy captures web screens in seconds - even pages behind a login. Most other tools can't do this.
Joyce Gorospe
Product Support Specialist, Applicaa
The screen capture copies the exact layout and UI of our system. And the select button is a lifesaver.
Your system, not a lookalike
Most AI prototyping tools approximate a design system from prompts and screenshots. Alloy reads the source, so generated UI is built from the components you actually ship.
| Capability | Generic AI prototyping | Alloy |
|---|---|---|
| Design system input | Paste a style guide into the prompt and hope it sticks | Upload the folder — an agent reads the actual source |
| Components | Regenerated lookalikes that drift from production | Your real components, reused with their original styles |
| Tokens and fonts | Plausible colors and type that are close but not yours | Exact tokens and font files extracted from your code |
| Team consistency | Every teammate re-explains the design system per prompt | Set a workspace default library once — every session uses it |
For the full landscape — token-sync pipelines and AI generation side by side — read our guide to design system to code tools.
Frequently asked questions
It means building prototypes from the components, tokens, and patterns your team already ships — instead of generic UI that gets restyled later. The prototype looks like your product on the first render, stakeholders react to something real, and engineers inherit work that already speaks the design system.
You upload a folder of your design-system or app source from your computer. An AI agent then reads the code and registers everything it finds into a library: components with their real source and styles, design tokens as CSS, icons, brand assets, and written guidance on how your UI is built. The agent is instructed to be exhaustive — every public component and icon, not a sample.
No. Libraries are created from a local folder upload straight from your browser — no repository permissions, CI setup, or token export pipeline. Pick the folder, watch the upload progress, and the analysis starts automatically.
The analysis reads TypeScript, JavaScript, React, Vue, Svelte, and Astro source, along with CSS, SCSS, Sass, Less, HTML, Markdown, SVG, images, and font files. Test files and build artifacts are filtered out automatically, and a single library can ingest up to 5,000 files.
When a library is attached to a session, its components, tokens, and assets travel with the prototype, and the AI is explicitly told to prefer your components over inventing new ones. You can also @-mention a specific component in chat to place it directly, with its original styling and design tokens intact.
Yes. Libraries can list the hostnames they belong to, and when you capture a page from one of those domains the matching library attaches automatically — so a captured screen and your component library end up in the same session, ready to prototype with.
Yes. While editing any prototype you can select an element and save it to a library as a component. Teams often start this way and upload the full design-system folder once the library proves useful.
Yes. Libraries belong to your workspace, and one library can be set as the workspace default so every new session uses it without anyone having to remember. Teammates can pick a different library — or none — per session.
Your upload is stored in Alloy’s secure storage and used to analyze and build your library. The analysis agent reads the source read-only, and irrelevant files like tests and build output are excluded before upload.
Token-sync tools keep values consistent between design files and code; they don't generate UI. Alloy solves the next problem: producing new screens that use your system rather than a lookalike. Our guide to design system to code tools compares both tiers, and the best AI prototyping tools roundup covers the wider landscape.