From the version 2.2 our mobile apps support options to present and set Deal tile color options. If you have set tile colors in web version they will be presenting in your mobile app as well:

Also if you wish to apply the color on a Deal tile in your mobile app, in iOS app you would click on "+" icon in the right hand side of that deal and the popup dialog that presents will show color palette at the top. Just tap the color you wish and it will apply.

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