# Color contrast ratio

> Color contrast ratio requirements for UiPath Apps, including minimum ratios for standard and large-scale text per WCAG 2.2 accessibility standards.

Color contrast ratios represent the difference in brightness of the colors in your app when represented on a computer display. Selecting an adequate contrast ratio makes your app interface more readable, especially to users with moderately low vision acuity.

* The color contrast ratio between text color and background color in your app must be at least 4.5:1.
* Large-scale text, or images containing large-scale text must have a contrast ratio of at least 3:1.
* For more details on accessibility standards concerning color contrast, refer to [WCAG 2.2](https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html).