Adapting a product to a foreign market does not simply mean translating its content into the target foreign language, but rather localizing the product in order to achieve customer loyalty and the feeling that the product was created specifically for that market. The problem with localization is that it should not add any new value to the product, and should be and remain unnoticed. Product localization is not a new user interface layout, but its adaptation using various user experience testing methods and user interface elements. Language, and thus culture, is the biggest obstacle to success in the desired market. In such cases, the user interface becomes one of the main elements of customization of the product itself. However, the success of adaptation will dictate an understanding of cultural and social differences. These differences are more difficult to apply when comparing American design practices of digital products with Croatian design practices, since the latter is largely based on the former (looking at the design process, but also the fact that most Croatian digital agencies work for the American market). When Eastern and Western cultures are placed in juxtaposition, cultural and social differences become more than apparent.