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Measure displays, generate colour-correction tables and verify the result.

View text contrast through different vision and lighting simulations.

Compare a text and background pair with editable colour values.

Attach a dependency-free colour popup to a page element.

Inspect a full-screen colour-vision simulation across applications.

AI chatbots and conversational interfaces for offline commerce businesses

A portable canvas for arranging visual references

Find US park and historic-place information before planning a visit

Engineering calculations documented in natural notation

Create colourful background images from several visual generators.

A practical reference of interface-design principles and effects

Compare text contrast with its size, weight and colour direction in view.

Icelandic weather, observations and natural-hazard information

Research Polish regions, cities and natural or cultural attractions.

North American bird identification and life-history reference

Public-domain small-scale map data

Scholar-written reference articles on philosophy

Browse named CSS colours beside their values and aliases.

Check colour pairs, sample an image and collect results for a PDF.

Computational queries across mathematics and factual topics

Draw on a phone or tablet with brush tools and translucent photo reference

Artist-owned stock photos and footage with tiered licences

Medical reference with professional and consumer versions

Houseplant care with a particular focus on light