WebAIM Contrast Checker vs APCA Contrast Calculator: catalog facts
 WebAIM Contrast Checker |  APCA Contrast Calculator |
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Free Free to use. |
Free Free to use in the browser. |
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Web |
Web |
- Separate results for normal text, large text and UI components
- Alpha and lightness controls for adjusting colors
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- Polarity aware, handling dark mode separately
- Shows contrast relative to font size and weight
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- Checks one color pair at a time
- Does not scan a live page
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- APCA is not yet a published WCAG requirement
- Results are not the same as WCAG 2 contrast ratios
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Web application |
Web application |
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Closed source |
Closed source |
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License not stated |
License not stated |
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No account needed |
No account needed |
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Not stated if it works offline |
Needs internet |
Checked September 23, 2026 | Checked October 1, 2026 |
Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.
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