Content is clear without relying on color alone
What this criterion checks
This criterion maps to 1.4.1 Use of Color. A detailed plain-language description is maintained in the WebLens criteria catalogue; the WCAG sub-test breakdown below describes exactly what the agent checks and what it does not.
How it's assessed
WebLens walks each user journey, captures a screenshot at every step, and an agent reasons over that evidence. See the how WebLens works for the full pipeline and the deterministic checks layered in for accessibility.
Sub-test coverage
1.4.1 Use of Color is broken into 4 sub-tests. Coverage is honest about where the agent is reliable, where it only partially checks the requirement, and where a human reviewer is still needed.
1 partial3 not covered
- Links are distinguishable without colorPartial
Our tool checks that links within text blocks have either a distinct visual style (underline, font styling, border, or background) that does not rely on color, or a contrast ratio of at least 3:1 with surrounding text. When only contrast is present (no distinct non-color style), it flags the link for manual verification of focus/hover styling.
- Charts and graphs use non-color distinctionsNot covered
Determining whether charts and graphs rely solely on color to distinguish data series requires human visual inspection. Not automatable.
- Color is not the only indicator for actionsNot covered
Determining whether action states (active, selected, enabled) rely solely on color requires human visual inspection. Not automatable.
- Color is not the only indicator of informationNot covered
Our tool does not detect general cases where color is the sole indicator of information (e.g., color-coded error messages, status indicators, categorization). The only 1.4.1 check is for links within text blocks (see below). Requires human judgment.
How reliable it is
This criterion is still building up testing data, so confirm its findings as you review. See Accuracy & confidence for how the confidence tags are set.