The paper “The application development project Personal Organizer” presents the steps of the application’s development and the tools and technologies that were used in order to make it. The goal of the application is to provide an always present mobile phone organizer which includes numerous features for everyday use. This application would mostly benefit people who have a tough time remembering important scheduled appointments. That is why the application includes functions such as an advanced alarm which offers a considerable number of opportunities for adjustment. The application also includes notes, checklists and other features that are usually used on a daily basis. The application MobOrg, which is an acronym of the words Mobile and Organizer, was planned as a simple dynamic application – simple because of its minimalistic and simple interface and also for its simple navigation; dynamic because the data for the interface development ‘is drawn’ from the data base within the application in order to load data in any given moment so the user can have a fast and clear view. Further in the paper, the development environment in which the application was made is presented. What is also presented is the steps of testing the application’s integrity, the development technologies used, the application specifications and the appearance of the application itself and how it was made. Each part of the application is explained in detail with pictures of the application as reference. The development technologies as well as the development environment used in the making of the application are described in a separate chapter. Parts of the code shown in the paper are from the application MobOrg itself. The code is checked for its correctness and it is functional