Design OS

Stop designing mockups that don't match reality

Design OS is the missing step between your product idea and your codebase.

Coming December 2025

Early sneak peeks available on X and Bluesky. Pro members have an early video walkthrough.

The Problem

AI coding tools are incredible at building fast. But the results often look... off. Inconsistent. Generic.

You describe what you want, the agent builds something, but it's not what you envisioned. That's because we're asking coding agents to do two jobs at once: figure out what to build and build it.

Design decisions get made on the fly, buried in code, impossible to change without starting over.

The Middle Ground

Right now, you have two options:

  • Vibe coding — Prompt your way from concept to app. Fast, but rough—then you spend just as long fixing it.
  • Hand-holding — Meticulously guide agents through every decision. It works, but it's exhausting.

Design OS is the middle ground: A structured, guided process.
You + AI.

  • Plan your product's vision, roadmap & architecture
  • Design perfectly tuned frontend screens
  • Export production-ready design components to hand off to your coding agent (or team)

Not Mockups—Actual Screens

You're not designing mockups that may or may not match the finished product. You're designing the actual screens of your app.

The components and assets you create in Design OS port directly into your codebase for implementation.

Who It's For

Technical builders who want full control over architecture and design decisions without doing all the legwork themselves. If you code, you can bring specific architectural and UX direction to every decision.

Non-technical product builders who have a strong vision for how their product should work and want to put their imprint on its systems—without needing a technical background to do it.

FAQ

What are the technical requirements?
What about the UI components and icons?
How does Design OS fit into my project?
What coding agents does it work with?
Do I need to know how to code?
How is this different from Figma?
Will Design OS be free and open source?

Get Notified

Design OS is coming in December 2025. Be the first to know when it launches, plus get early access and updates along the way.

Early sneak peeks available on X and Bluesky. Pro members have an early video walkthrough.

Builder Methods

Training & community for pro software developers building with AI.

Created by Brian Casel (that's me). I'm a career software developer, founder, and creator of Builder Methods and Agent OS, the system for spec-driven development with AI.

© 2025 CasJam Media, LLC / Builder Methods
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