Duply

What is Duply

Duply is a design-system library for people building websites, apps, and SaaS products with AI coding tools. It turns real product interfaces into practical DESIGN.md files that describe how a design system actually feels and works—from typography, spacing, colors, components, layout patterns, and interaction rhythm to the overall visual direction. Instead of making your AI agent invent a style from a vague prompt, you can choose a reference from the Duply library, copy the DESIGN.md, and use it as a clear design guide inside your workflow. This helps AI-generated interfaces look more consistent, polished, and intentional from the first build.

How to use Duply

1. Browse the library of over 312 real-world design systems (e.g., Stripe, Linear, Vercel, Notion, Anthropic, Supabase, and many more).
2. Filter by style, industry, surface, color, and typeface to find a design you love.
3. Copy the DESIGN.md file for that design system.
4. Hand the file to your AI coding agent as a clear design guide.
5. Your AI agent builds interfaces in that visual language accurately.

Features of Duply

• Real-world design systems: Over 312 design systems decoded from actual product interfaces.
• DESIGN.md files: Each design system is documented as a ready-to-use markdown file covering typography, spacing, colors, components, layout patterns, interaction rhythm, and visual direction.
• Filterable library: Browse and filter designs by style, industry, surface, color, and typeface.
• Free to browse: No cost to explore the library.
• New designs weekly: The library is updated regularly with new design systems.
• AI-agent ready: DESIGN.md files are formatted to be directly used by AI coding tools.

Use Cases of Duply

• Founders and developers: Quickly give your AI agent a consistent visual language for your product without manual design work.
• Designers: Use real-world design references as inspiration or starting points for new projects.
• AI builders and vibe coders: Reduce random design choices and back-and-forth prompt tweaking by providing a clear design guide.
• SaaS product teams: Ensure AI-generated interfaces match a polished, intentional design system from the first build.

Pricing

Duply is free to browse. The library is accessible at no cost.

FAQ

What is a DESIGN.md file? A DESIGN.md file is a markdown document that describes a design system's typography, spacing, colors, components, layout patterns, interaction rhythm, and overall visual direction. It is formatted to be used directly by AI coding agents.

How many design systems are available? The library currently contains 312 design systems, with new designs added weekly.

Can I request a design system? Yes, you can request a design by emailing contact@duply.ai with the subject "Design request".

Is Duply free? Yes, browsing the library is free.

Who is Duply for? Duply is for founders, developers, designers, AI builders, and vibe coders who want faster UI direction, fewer random design choices, and less back-and-forth prompt tweaking.