Credits

cssints is MIT. It stands on other people's work; this is what we took, from whom, and under which license. A package that copies data or code carries the upstream notice (a Credits or Licenses section of its README, or THIRD_PARTY_NOTICES.md).

Data and code that ships

Where	What	From	License
@cssints/tokens	the Open Props, Radix Colors, Flexoki and Reasonable Colors sets	Open Props (Adam Argyle), Radix Colors, Flexoki (Steph Ango), Reasonable Colors (Matthew Howell)	MIT, notices in its README
@cssints/css-grammar	the CSS syntax strings (src/mdn.ts, keywords.ts, functions.ts), also in the types of cssints	mdn-data; the numeric ranges it omits from @webref/css	CC0-1.0; MIT (W3C)
@cssints/css-grammar	browser support warnings, read from the package (not copied)	@mdn/browser-compat-data	CC0-1.0
@cssints/fonts	the latin character weights and the metrics of Arial, Times New Roman and Courier New	Capsize (SEEK)	MIT, notice in its README
@cssints/icons	nothing: the collections are your dependency	Iconify @iconify-json/*	each collection's own
tools/ai-automation/vendor	lint rules, not published	dmmulroy/anti-slop (Dillon Mulroy)	MIT, LICENSE and UPSTREAM.md
apps/sky	layout and token values; Inter; Phosphor icons	Mu and @bsky.app/alf (Bluesky Social PBC), Inter, Phosphor	MIT; OFL-1.1; MIT
apps/demo	Material Design Icons (@iconify-json/mdi)	Pictogrammers	Apache-2.0

Ideas and designs

No code is copied from these; each package README says which part follows which.

• Plugin packages. Every Layout and smolcss (layout), nytimes/text-balancer and react-wrap-balancer (balance), fluid-tailwind (fluid), postcss-easing-gradients (gradient), tailwindcss-motion and tailwindcss-animate (motion), the supersonic plugin and lax.js (reveal), sync-skeleton (skeleton), bramus/sticky-observer (stuck), unpic-placeholder and ThumbHash (placeholder), nutelch and Leonardo (ramp), the resets of Josh Comeau, Jake Lazaroff, Vale and Andy Bell (reset), Mise en Mode and its Mode Contract (mise-en-mode), brendonovich/vite-plugin-opencode (the prompt box of devtools).
• The engine. The comparisons in docs/research record what we took from StyleX, vanilla-extract, Tailwind CSS, Tokenami, SugarCube and the React Spectrum style macros; the first spark was Haz's post on a CSS framework in TypeScript. Tokens follow the Design Tokens Community Group format.
• apps/sky follows the look of Mu and the hue slider of Witchsky.

Built on

Effect, Vite and Vite+, OXC, LightningCSS (MPL-2.0; its wasm build runs in the playground), culori, TypeScript and TypeScript Go, Bun, Solid, OpenTUI, Shiki, Monaco Editor, Playwright, fast-check, Quint, atcute, and Beans for the tickets. Phosphor icons (MIT) are on this site through @iconify-json/ph. Every dependency keeps its own license; none is copied into the repository.