The ever-growing number of applications in online stores makes mobile development one of the most dynamic and competitive sectors. However, the average user retention rate of mobile apps was only 38% in 2018 (for comparison, it was 38% and 37% in 2016 and 2017 respectively). How to make the app a success? UI design of the app strongly enhances UX which is the main component that ensures the success of the app. In order to improve analytics, we decided to understand the design trends of mobile development for 2019.