Adjust contrast

The contrast settings of some websites may be difficult to see for people with low vision or may cause eyestrain. This feature allows the user to choose preferred contrast settings.

Discussion by Disabilities (Benefits & Preferred Behaviors)

Low Vision

Adjustable contrast settings allow people with low vision to personalize contrast settings so that colors are distinct and easy to see.

Existing Products

Please note that these products are not necessarily endorsed by RtF, but represent the range of available options.

Open Source and free

These products are free and their source code may be modified with few restrictions.

Free, not necessarily open source

These products are free to use, but may have strict restrictions on viewing and modifying source code.

Commercial, with free trial

These products are free to try for a limited period of time or with limited functionality. They must be purchased for full functionality.

Commercial, no free trial

These products must be purchased to be used, and did not offer free trials at the time of posting.


by jonathantneal

Check CSS for WCAG color contrast compliance


by Asqatasun

Firefox extension to ease use of Asqatasun Contrast-Finder


by Asqatasun

Contrast-Finder finds correct color contrasts (background / foreground) for web accessibility (a11y, WCAG, RGAA).


by Qambar

An accessibility checker tool for validating the color contrast based on WCAG 2.0 standard.


by johnotander

Get the contrast ratio and WCAG score between common CSS color types in order to ensure accessibility


by PitPik

Advanced javaScript color picker and color conversion / calculation (rgb, hsv, hsl, hex, cmyk, cmy, XYZ, Lab, alpha, WCAG 2.0, ...)


by Tanaguru

Find valid background / foreground color contrast for accessibility (a11y, WCAG)


by tmcw

WCAG contrast ratio measurement and scoring


by mkdynamic

Calculate the WCAG contrast ratio between 2 colors.