About Color Contrast Checker
A focused website for one practical task.
Purpose
Check foreground and background contrast while designing interfaces. Enter 3- or 6-digit hex colors; also test real components, focus states, and the relevant accessibility requirements.
The tool is intended to work without accounts. In this starter version, calculations run in the browser and there is no form-submission backend.
Accuracy and limitations
This is a numeric contrast aid, not a complete accessibility audit.
Formulas and assumptions are shown so visitors can review the result; no particular outcome is guaranteed.