Resources
Curated external resources for designers and developers — color theory references, accessibility tools, CSS documentation, design systems and learning materials.
These are external resources we find genuinely useful and reference ourselves. We have no affiliation with most of them — they are here because they are excellent, not because anyone paid for placement.
Color Theory & Education
Interaction of Color — Josef Albers
The foundational book on color perception. Albers's exploration of how color behaves in context is still the best introduction to color relativity.
View book →The Elements of Color — Johannes Itten
Classic Bauhaus treatment of color theory. Dense but rigorous — the source of most "color wheel" and "color harmony" terminology in modern design.
View book →Color: A Course in Mastering the Art of Mixing Colors — Betty Edwards
Practical introduction to color mixing for painters and artists. Excellent for understanding subtractive color deeply.
View book →Color Science
W3C CSS Color Module Level 4
The definitive specification for CSS colors. Authoritative reference for anyone implementing color systems.
Read spec →Colorimetry: Understanding the CIE System
Technical reference for colorimetry. Covers the science behind color spaces like sRGB, Lab, and XYZ.
View book →Accessibility
WCAG 2.2
The current Web Content Accessibility Guidelines. Success criterion 1.4.3 and 1.4.6 define color contrast requirements.
Read WCAG →WebAIM Contrast Checker
A well-established independent WCAG contrast checker. Good for cross-verification with our tool.
Open tool →The A11Y Project
Community-driven accessibility resources. Practical checklists and guidance for implementing accessibility.
Visit →CSS & Web Development
MDN Web Docs
The best reference for CSS, JavaScript, DOM and web APIs. Continuously updated and community-maintained.
Visit MDN →Can I Use
Check browser support for any CSS or JavaScript feature. Essential before using newer color functions like OKLCH.
Check →CSS-Tricks
Practical CSS articles and tutorials. Their gradients and color syntax guides are excellent references.
Visit →Design Systems
Material Design
Google's design system. Extensive documentation on color tokens, semantic colors and accessibility.
Visit →Tailwind CSS
Utility-first CSS framework with a well-designed color palette. Reference for our Tailwind color tool.
Visit →Learning & Practice
Smashing Magazine
In-depth articles on design, development and accessibility. Quality over quantity.
Visit →A List Apart
Long-form articles about web standards and design practice. Essential reading since 1998.
Visit →Content Policy Note
This page includes external links that we believe are genuinely useful. We do not use affiliate links, and none of the links on this page generate revenue for OmniColor. If you find a link is broken or the resource has changed, please let us know.
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