Open source Interface design
Bronto UI
CSS-first building blocks for developer tools, dashboards, and reports.
An interface system that gives different applications a consistent visual language without requiring another component runtime. It provides CSS tokens, semantic patterns, and optional behavior modules; the host application keeps ownership of data and logic.
Why it exists
Across services and tools, many interface problems repeat: navigation, tables, status, forms, and readable explanations of system behavior. Bronto UI turns those recurring decisions into a shared foundation.
HTML remains HTML, the styling is ordinary CSS, and JavaScript is opt-in where interaction needs it.
How it works
Bronto UI is organized around design tokens, a class vocabulary, and small framework-agnostic behavior modules. It supports application interfaces and extends into analytical presentation, provenance, and print-oriented layouts.
It ships with zero runtime dependencies and has CI-tested examples and visual regression fixtures. The project remains under active development.
More than one kind of interface
Other compositions built from the same foundation.
Static reports 
Theme playground Bronto UI is available under the MIT license.
Visit the project website