Written explanations of the problems our tools solve — why a PDF pastes with a line break on every line, what a JWT actually contains, how sales tax works backwards. Every guide ends at the tool that does the job for you.
10 guides, linked to the 45 free tools that run in your browser.
Compliance & Accessibility
It is a luminance ratio weighted heavily towards green, which is why it says nothing about hue and nothing about colour blindness. The thresholds, and the four things the number does not tell you.
Tool: Colour Contrast Checker
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Reasonable. The guides exist for when something is behaving strangely and you need to know why. When you just need it fixed, go straight to the tool.