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

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

Build an eleven-step scale and export variables for a web project.

Edit a colour system in perceptual coordinates and copy design tokens.

Preview webpage colours through eight simulation modes in Chrome.

Control gradient colour positions and the transitions between them.

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

Build CSS gradients while exploring different colour spaces.

Choose colours with saturation scaled to the available RGB range.

Choose numbered shades whose separation indicates minimum contrast.

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.

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

Adjust CSS colour pairs and inspect their changing contrast ratio.

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

Convert colours between spaces and control their CSS output.

Find replacement colours that meet a chosen contrast target.

Choose a starting colour and explore a related scheme.

Preview colour-vision differences through a screen filter or phone camera.

Substrate account watchlists, Telegram transfer alerts and indexed data