Meet the renderer-independent framework bringing stylesheets, design tokens, and modern layout workflows to Unity UI.
FleXss
A renderer-independent framework that brings CSS, design tokens, and Flexbox-style layout to Unity UI.
- First renderer
- uGUI
- Stage
- Closed beta
- Focus
- Layout, styling & theming
One stylesheet for Unity UI
FleXss is a renderer-independent authoring layer for Unity UI. It sits above systems such as uGUI and UI Toolkit, giving teams one place to define layout, styles, themes, tokens, and reusable classes without tying the design system to a single renderer.
The first public release is centered on the production-tested uGUI implementation. It supports familiar stylesheet-driven workflows, stable Flexbox-style layout, programmatic animation, and editor tools that can help convert existing prefabs and scenes instead of forcing a rebuild.
FleXss has grown through more than a decade of Unity work across games, industrial applications, and VR. Early versions powered interface animation in Reliquary; the current system supports the cross-platform, accessible interface behind SkillSaige.
The core slice is now moving into a limited closed beta. Testers will help us pressure-test real project integration, layout edge cases, custom components, theme workflows, diagnostics, and documentation.
Read the introduction and beta details, or apply for the FleXss closed beta.
Latest updates
Building a UI-heavy Unity project?
Tell us where Unity UI slows your team down and what you would want FleXss to solve.