iTwinUI
Design system from Bentley Systems with a React component library, CSS and design-token packages.
itwinui.bentley.comrepositorydocs
iTwinUI is a design system from Bentley Systems for web interfaces in Bentley and iTwin.js applications. It comes as three npm packages: CSS for every component, CSS variables for the design tokens, and a React component library that builds on the CSS. The documentation covers the React package, which is installed with npm.
Worth knowing
The README says iTwinUI is in maintenance mode, with StrataKit replacing it as the primary design system. A migration guide and a theme bridge for running both libraries side by side are linked from the README.
Identity
Rendering and deploy
- Install with
- npm3
Releases
Adoption
Sources
- 2026-10-27: links
itwinui.bentley.com/ - 2026-10-27: links, GitHub stars
api.github.com/repos/iTwin/iTwinUI - 2026-10-27: links, Install with
github.com/iTwin/iTwinUI/blob/main/apps/website/src/content/docs/index.mdx - 2026-10-27: First release
registry.npmjs.org/@itwin/itwinui-react - 2026-10-27: Maintainer, Maintained by, License
github.com/iTwin/iTwinUI/blob/main/LICENSE.md - 2026-10-27: Written in
api.github.com/repos/iTwin/iTwinUI/languages - 2026-10-27: Categories
github.com/iTwin/iTwinUI/blob/main/README.md - 2026-10-27: Built on
github.com/iTwin/iTwinUI/blob/main/packages/itwinui-react/README.md - 2026-10-27: Current major version, Last release
github.com/iTwin/iTwinUI/releases/tag/%40itwin%2Fitwinui-react%403.22.0 - 2026-10-27: Contributors
api.github.com/repos/iTwin/iTwinUI/contributors - 2026-10-28: npm downloads a week
api.npmjs.org/downloads/range/2026-09-28:2026-10-04/@itwin/itwinui-react - 2026-10-27: Dependent packages, Dependent repositories
packages.ecosyste.ms/api/v1/registries/npmjs.org/packages/@itwin%2Fitwinui-react