As for the new version of CCA, I found some user interface problems that could be improved.
- "Contrast Ratio" is unexpectedly unnoticeable since it is displayed far from "WCAG 2.1 results".
- The color swatch display (background fill) in the "Foreground colour/Background colour" area may have too much visual impact for some values, making the "Sample preview" less visible.
- In the "Sample preview", an example of the non-text is a teacup icon. Maybe it's better to use icons and graphics that are common in web content as examples. And if possible, it would be nicer to be able to insert arbitrary SVG or icon font as preference.
- The success/failure decision for "WCAG 2.1 results" is a bit confusing. Especially in the case of conditional OK (when both a green check mark and a red x mark are displayed), we have to read carefully the description adjacent to the green check mark/red x mark. It is a bit troublesome for non-native English speaker.
I just made an improved user interface sketch. I will be glad if it helps. :)

As for the new version of CCA, I found some user interface problems that could be improved.
I just made an improved user interface sketch. I will be glad if it helps. :)