Color.review

About Color.review

Color.review is a web-based tool for checking the contrast between a foreground and background color, expressed as a numeric contrast ratio. Colors can be entered and adjusted using RGB, HSL, or CMYK values, and specific color pairs can be linked to directly via URL (e.g., color.review/check/293845-FFFFFF).

The tool evaluates contrast against the WCAG 2.1 accessibility standard, covering both the AA level (4.5 for normal text, 3 for large text/headlines) and the stricter AAA level (7 for normal text, 4.5 for large text). It also notes a minimum contrast of 3 for non-active interface elements like buttons and sliders.

The site is aimed at designers and developers working on accessible digital interfaces, referencing an estimate of 217 million people living with visual impairment as motivation for checking color contrast. It is made by Anton Robsarve, who was at the time soliciting interest in a version of the app with additional features such as swatches and an eyedropper tool, for OS X, Windows, iPhone, and Android.

Key features

• Calculates contrast ratio between foreground and background colors
• Checks contrast against WCAG 2.1 AA and AAA standards for text and headlines
• Supports color input in RGB, HSL, CMYK, and CSS hex formats
• Generates a direct shareable link for a given color pair
• Random color generator for testing contrast combinations

Frequently asked questions