PearlDiary is a mobile application developed for an external client with the goal of digitaliz-ing the process of documenting and logging information when dealing with a severe disease. This report will focus on cancer and specifically children with cancer. Documenting and handling the information given by hospitals can be overwhelming to the patient, or the parents of the patient, and therefore PearlDiary was developed to explore the possibilities of documenting the process in a more modern way. In this thesis report a comparison be-tween the methods used today and the application developed in the project is made, as well as an evaluation of the developed application. PearlDiary was developed as a web applica-tion in HTML5, which is able to run on most modern mobile platforms. The comparison is done by testing the application with the help of a closed test group consisting of users previously experienced with the methods used today. The result shows that the test group was overall positive to use PearlDiary as a substitute or as a complement to the methods they're already using and that PearlDiary was easy to use as a method of documenting their treatment