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Use colour-science tables with explicit sampling, metadata and citations.

Find official colour-management specifications, registries and technical resources.

Preview webpage colours through eight simulation modes in Chrome.

Bring an existing set of colours together with a shared tint.

Tailwind components with JavaScript setup and framework guidance

Open-source interface design with CSS-based layouts

Choose colours with saturation scaled to the available RGB range.

Build measured colour profiles with a documented command-line toolkit.

Choose scientific colour maps to match the structure of your data.

Share colour configurations and transforms across visual production tools.

A source and web editor with built-in HTML preview, file tools and language-server support.

See curated palettes applied to page elements and copy their hex codes.

A Notion web clipper for capturing articles, highlights, and other web content.

Browse compact four-colour combinations with visible hex values

See how a colour pair performs for different text sizes.

CC0 photography with subject and colour browsing

Five-colour palettes drawn from named paintings and their artists

Find replacement colours that meet a chosen contrast target.

Recreate target images with CSS in scored challenges

Generate distinct colours for categories in a data visualization.

Choose a starting colour and explore a related scheme.

Map twelve-step colour scales to interface roles and light or dark themes.

Render HTML and CSS into PDF from a command line or Python

Publish XML and HTML documents using XSL-FO or CSS