Comparison
Accessibility auditvsContrast ratio
Accessibility audit
the automated check found the missing labels and the contrast failures, and nothing about whether the flow made sense.
An automated scan of rendered output against machine-checkable accessibility rules, runnable in a component test or a browser test. It reliably catches missing names, bad contrast, invalid ARIA and duplicate ids, which is a meaningful share of real defects. It cannot judge focus order, announcement quality or whether an interaction is usable, so it narrows manual testing rather than replacing it.
Full entry →Contrast ratio
the grey-on-white caption looked fine on your monitor and failed the check at 3.1 to 1.
The measured luminance ratio between foreground and background, with WCAG requiring 4.5:1 for normal text, 3:1 for large text and for meaningful non-text elements. It is a computation, not a judgement, which makes it one of the few accessibility criteria that can be enforced automatically. Light grey secondary text and placeholder colours are where nearly every design system fails it.
Full entry →