Developing an application for several platforms can be time consuming because each platform has its own operating system and different developing language. Cross-platform development makes it possible to develop an ap-plication that will work on several platforms. This report will evaluate this kind of development by doing a case study for the company CGI. The case study will evaluate which cross-platform methodology is the preferred choice for this specific vacation booking application I developed for CGI. The different methodologies I studied were web, hybrid, interpreted and cross-compiled. The preferred methodology for this vacation booking application I developed was in this case the hybrid alternative. When selecting this methodology I also chose two different tools and those two were Icenium and jQuery Mobile. The purpose of this report was to find out if cross-platform development can be a substitute to native programming and by evaluating and developing cross-platform I found out that it can be a substitute if the application is not to complex. In this specific case I also believe that hybrid development is a good substitute to native development for this kind of applications.