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Build interface colour scales with shade curves and contrast targets.

Edit one colour across familiar web formats and wide-gamut OKLCH.

Generate five-colour palettes while keeping selected colours fixed.

Search plants by name, habitat and documented uses

Inspect colour values and CSS examples, then browse community palettes.

Use colour schemes and colour-space operations in D3 projects.

Compare colour references, build complements and convert colour data.

Compare camera images in original and simulated colour-vision views.

Browse named web colours, related swatches and downloadable colour icons.

Generate a chosen number of shades and copy their values.

Create related palettes and CSS gradients from existing colour values.

Publication and authorship details for vascular-plant names

Five-colour palettes drawn from named paintings and their artists

Compare market-structure measurements with their historical outcomes

Explore crypto derivatives and purchase selected historical datasets

Build browser colour grades with reusable exports and shared review.

Add a configurable colour and opacity picker through a web input attribute.

Convert colour values and collect palettes for design or code.

Turn a text description or photograph into a colour palette.

Model paint-like colour mixing in a JavaScript application.

Use versioned colour scales designed for accurate data communication.

Pick a physical screen pixel and paste a colour value in your code style

Historical images with context, free downloads and detailed rights labels

Convert colour spaces and model perception-related transformations in Python.