Research on Color Design of Human-computer Interaction Interface of Mobile App

In the era of mobile Internet, the design effect of human-computer interaction interface of mobile App is not only closely related to brand image and functional value, but also directly related to the quality of user experience. As a bridge between App and users, the interface design's internal layout, background, icons, buttons and colors all carry the function of information transmission. Among them, color, as the most intuitive and emotional element in interface design, plays a vital role in the aesthetics, ease of use and emotional response of users. In this regard, this paper deeply discusses the principles, technical links and practical application of color design in the human-computer interaction interface of mobile App, aiming at improving the user's experience and satisfaction through reasonable color matching and application. Practice has proved that developers can better complete the color design and collocation of the interactive interface under the Flutter framework, thus ensuring that the overall visual effect of the App matches the brand image and target audience. At the same time, by collecting and analyzing the data of evaluation indicators such as user satisfaction, operational efficiency, retention rate and activity, it also proves the effectiveness of the color design scheme of App human-computer interaction interface in improving user experience and brand value.