Several different elements can be customized on the TrialKit mobile app so color scheme matches that of the sponsor. In other words, the users on your studies can use both a website and mobile app that is customized for your organization. 

Unlike the website, the mobile app can only be customized for the account as a whole and will remain the same for all studies under that account.

This customization for the app must be done on Clinical Studio, and can be found here:

The default TrialKit theme colors are as follows: