Contrast widget
A simple widget you can add to your bookmarks to check a site’s text contrast. The minimum requirements according to WCAG 2.0:
- minimum of 3:1 for large text
- minimum of 4.5:1 for body text
(contrast ratio is a scale from 1 to 21)
Note that web accessibility is not only for those with poor sight. Proper contrast also helps when e.g. viewing screens outside or dimmed screens.