Introducing Astryx by Meta: an open source design system built for how we build now

Open source is how the best ideas in our industry travel. The tools we reach for every day, like React, StyleX, PyTorch, got better because someone decided to share them, and a community made them stronger. Today, we're adding one more.

We're excited to introduce Astryx by Meta, an open source design system that's AI fluent and fully customizable without dependencies. It's a complete, production-ready (and growing) toolkit with 150+ accessible components, brand-level theming, dark mode, ready-to-ship templates, and a CLI – all as one cohesive system, built on React and StyleX.

Astryx has matured within Meta for the last eight years and powers over 13,000 apps. It's shaped by the designers, engineers, and product teams who depend on it every day and now, it's yours, too.

Start anywhere, change anything, and ship faster

Most design systems make you choose. Adopt a big company system and you inherit its brand – your app ends up looking like someone else's product. Reach for copy/paste component collections and you get freedom, but every project forks its own snippets with no shared coherence, no upstream fixes, no upgrade path, and accessibility quietly becomes your problem.

Astryx is built to end that trade-off. The system controls behavior, accessibility, and quality, while themes control how it looks. You customize at the token level (color, typography, radius, motion), so that you can make it unmistakably yours without starting from scratch and without rewrites. Builders can stop reinventing the basics and start shipping ideas faster.

Built for people and the agents building alongside them

The way we build software is changing, and Astryx is designed for people and the agents building alongside them. Design systems have historically been designed for human consumption but as more code is written by agents, we have to rethink how design systems are structured and the role that they play. Astryx was built ground-up to be AI-operable, opposed to retrofitting existing design systems to play nicely with agent behaviors. It's an open source design system built for how we build in this new world.

Astryx is in Beta and ready for you to build with today. Check out the components, the docs, and the project on GitHub to get started.