Conference, congress and symposium management systems are generally developed as Web applications.The increasing use of mobile devices day by day necessitates that such systems can be used easily in portable devices. Most of systems try to solve this necessity with developing responsive page designs or mobile specific pages. However, mobile devices are constantly on the move and can not always have a reliable internet connection. As an expected result of the mentioned situations, it can be said that they require a client-side application enabling offline review and editing. In this paper, a client application developed for the Android operating system is integrated with the conference management system web application offering a simple level API. While the user tries to log-in to the system by application, necessary information are copied to local database. Logged-in user can access and edit the information in the local database even if the internet connection is lost. The changes are synchronized immediately with the remote server if there is an internet connection. Otherwise, they are stored in the local database for updating remote server when the internet connection is established. By applying this type of mechanism, it is guaranteed that users can utilize from the developed system both online and off-line.