Watch: Ben Crompton interview

Your browser’s own zoom and text-size settings still work, and stack with this.

Not one switch: more contrast helps some readers, less helps others.

Following your device: default contrast.

Black text on a white page is the harshest combination there is. A tint takes the glare off without making the text harder to read.

Pulls apart colours that are easily confused. Pick the one matching the colours you find hard to tell apart — the preview below changes with it.

This changes how colours look — it can’t rescue anything we’ve shown by colour alone. If you find something you can’t tell apart, please report it and we’ll fix the page.