Color Contrast Checker in CC?

[Citizen-and-Saint]

Is there a color contrast checker available within Illustrator, Photoshop, etc.? This would be an extremely helpful tool for graphic/web designers to ensure their color designs are accessible without having to leave CC to use a third-party app.

[Monika Gause]

There is the colorblindness preview option.

But no built in color contrast checker.

For Photoshop there is an extension available:https://exchange.adobe.com/creativecloud.details.12170.check-contrast-ratio.html