Here’s one for the web designers: a contrast checker for HTML colours.

Working on your big-screen, perfectly calibrated monitor you probably have no idea of how readers view your site. Or perhaps can’t view your site.

Not everyone has top of the range equipment and many may have visual impairments that make it hard for them to distinguish the various pieces on your cleverly designed website with subtle colour variations. Colour Contrast Checker is an easy-to-use tool to test out various colours against one another to make sure they are suitably contrasted for easy reading.

It’s pretty obvious how to use Colour Constraster: plug in your chosen hexadecimal codes and tweak the set-up with the sliders.

Although designed mostly to help designers cater for visually impaired users Colour Contrast Checker is just as useful for any time you need to set up the colour scheme for any new website.