The diploma thesis deals to design and develop mobile application for sales promotion in retail chains. Mobile application is created on base of designed service for sales support, that subject and design is written in thesis too. Mobile application uses the most modern technologies, which are now available in mobile devices. This technologies ensuring identification of customer in store, share marketing information to customer and other possibilities gaining detailed information about shopping behavior of customer. Thanks to those data is possible analyze customer by different methods which are in thesis described too. Based on this analyses it can be streamlined sales, shopping and other retail processes. Main aim of thesis is make usable mobile application which promote sales in retail chain. Theoretical part of thesis deals to describe general marketing on which is based analytical marketing resp. Data-Driven Marketing. Next part of this chapters is defining of retail, explaining its specifics and showing interleave to modern technologies. Concrete possibilities of modern technologies is presented in last chapter of theoretical part which is primary focused on mobile application developing in IBM Worklight environment. Practical part of thesis is divided to two chapters where first chapter deals to description designing service for sales promotion. Description is built by architecture, data flows and design of communication interfaces. In second chapter is described design of mobile application based on the service, from user interface to technological architecture. In this part of thesis the mobile application is developed, provided as a OpenSource with all source codes and available online as a demo version. The main output of thesis is mentioned mobile application, which is detailed described in end of practical part. There is specified link to online available version of this application. Mobile application contains diverse functionality for customer and its aims to test usability of modern possibilities in real-life.