Newly built mobile apps often support only two proprietary platforms, further feeding an unhealthy duopoly. Yet, a vast majority of mobile apps could also be built platform-independent as a ProgressiveWebApp (PWA). PWAs run almost anywhere - but is this technology really a suitable alternative? At Bingen UAS, our students implemented DigiZiege - a PWA for goat farmers that provides photo-based weight assessment, various horde management functions and run fully offline. In this talk, we reflect on our experience and report lessons learned.