Manual color selection

If customizing colors through individual selection, follow the 1.4.3 Contrast (Minimum) guideline. The contrast between text and background should be greater than or equal to a 3:1 ratio for large text and graphics, and 4.5:1 for regular text.

• Large text: 14pt / 18px bold and above; 18pt / 24px normal weight and above

• Regular text: everything else

Several online tools can help verify color contrast ratios:

• Siege Media Contrast Ratio

• WebAIM Contrast Checker

• Tanaguru Contrast Finder

• Directed Edges Contrast Grid

• ColorZilla is a Chrome and Firefox plug-in that can extract colors from a web page or screenshot.

For desktop tools:

• Vispero Color Contrast Analyzer (CCA)

• Color Oracle

Shared theme

For customers who already have an accessible theme or who want to set one at the organization level, ArcGIS Online and ArcGIS Enterprise allow you to set up a shared theme. This theme can then be inherited by other apps.

Related criteria

The Web Content Accessibility Guidelines tied to this topic are as follows:

• 1.4.1 Use of Color

• 1.4.3 Contrast (Minimum)