This thesis concerns the development and evaluation of Chattitude, whose purpose it is to influence textual conversations. To achieve this, modern Natural-Language-Processing(NLP) systems are integrated into Chattitude. The results of these analysis approaches, namely the emotional and profane contents of a message are then visualized in the user-interface, so that users are encouraged to reflect over the content they are about to send. Through a user study the user experience of Chattitude and the effect of its signature features, the visualizations of the integrated analysis systems, is evaluated. The results show that the user experience of Chattitude is sufficient enough to have no negative influence on the study. In one metric it even closes the gap between it and other commonly used applications. The effect of the signature features is not significant on the user experience of Chattitude, but improvements and fine-tuning is still needed to achieve a notable positive influence on conversations.