For several decades, market fragmentation caused by different operating systems has been complicating and overpricing the process of creating new applications. Unified development for multiple platforms does not only save time and expenses, but also enables to reach a far wider audience. This work presents the topic of a cross-platform mobile development and analyzes the development of the market for currently the two most prevalent operating systems – Android and iOS. The results of the analysis are used to design and create a multiplatform tool intended to monitor immunopathologic reactions. The work also includes a marketing plan and expected economic valuation once the developed application is introduced to the market.

Rapid growth in mobile technologies since the 2000s is reflected in continued smartphone adoption and the expansion of mobile health (mHealth) smartphone applications for pain assessment. Yet there exists a lack of research-based pain assessment apps for endometriosis, a prevalent yet underrepresented disorder where pain management plays a vital role. The predominance of the iOS and Android smartphone operating systems has previously required developers to maintain two separate codebases and development environments in order to access a combined 99% market share. Since 2015, cross-platform development softwares have allowed for maintenance of a single codebase and environment. This thesis explores the development of a cross-platform smartphone app for endometriosis pelvic pain assessment where design decisions are informed by endometriosis and pain assessment research as well as engineering particularities of the React Native framework. The completed prototype along with this thesis’ design discussion indicate that research findings into endometriosis pain assessment can be successfully adapted via React Native into a visual, gesture- guided functionality for the self-assessment of endometriosis related pelvic pain. / Den snabba tillväxten inom mobilteknik sedan 2000-talet återspeglas i en fortsatt ökning av smartphone-användare samt utvidgningen av mobilhälsoapplikationer (mHealth) för smärtbedömning. Ändå finns det en brist på forskningsbaserade smärtbedömningsappar för endometrios, en vanlig men underrepresenterad sjukdom där smärtlindring spelar en viktig roll. Övervägande av operativsystemen iOS och Android har tidigare krävt att utvecklare underhåller två separata kodbaser och utvecklingsmiljöer för att få tillgång 99% av marknaden. Sedan 2015 har mjukvaror för plattformsoberoende utveckling av mobilapplikationer möjliggjort underhåll av en enda kodbas och miljö. Denna avhandling undersöker utvecklingen av en plattformsoberoende applikation för smarttelefoner för utvärdering av bäckenvärk relaterade till endometrios, där designbeslut baseras på forskning om endometrios och smärtbedömning samt tekniska särdrag i React Native-ramverket. Den färdiga prototypen tillsammans med avhandlingens designdiskussion indikerar att forskningsresultat kring bedömning av smärta i endometrios kan anpassas via React Native till en visuell, geststyrd funktionalitet för självbedömning av endometriosrelaterad bäckenvärk.