Web Color Checker

A tool for checking accessibility properties of color schemes for the web.

Contrast ratios are calculated using the WCAG 2 algorithm assuming an sRGB color space. Target values for good readability are 4.5 or better, with 7 or better being ideal.

The various samples of color-blind appearances for colors are computed using the HCIRN color blindness simulation function, which is known to not be perfectly accurate but provides a reasonable approximation for designer purposes of what a person with that type of color blindness would see.

The HCIRN Color Blindness Simulation function is Copyright © 2000-2001 Matthew Wickline and the Human-Computer Interaction Resource Network, which is free for non-comercial use.

jQuery is copyright the JS Foundation and it's contributors and is used here under an MIT license.

Bootstrap is copyright Twitter Inc and the Bootstrap Authors, used here under an MIT license.

Arrive.js is copyright Uzair Farooq, used here under an MIT License.

All other code is Copyright © 2019 Austin S. Hemmelgarn and released under the MIT License