Capturing positive and negative emotions while applying technology is a complex, but profitable subject. Positive emotions improve the desirability of a product and lead to an enhanced probability of purchase and recommendation (positive UX). Today, we rely predominantly on data obtained from subjective questionnaires (e. g. How did you feel about this product? How are you feeling right now?) - even though much of what we do is processed unconsciously and our responses to such questions can be biased due to social desirability. The consideration of physiological information of users is a promising field to orient future product developments to their end users and thus to be able to design them according to their needs.