The increasing diffusion of digital platforms has transformed smart home technologies into complex platform ecosystems in which value is generated through interactions among devices, services, and users. In this setting, platform openness has emerged as a key design and governance principle shaping interoperability, innovation, and user experience. However, existing research has primarily examined platform openness from a firm-level and ecosystem governance perspective, while its implications for consumer perceived value remain underexplored, particularly in cross-national contexts. This study investigates how platform openness influences consumer perceived value in smart home ecosystems. Rather than conceptualizing openness as a single attribute, the study adopts a multidimensional perspective, capturing how openness affects consumers’ interactions with data, interfaces, complementary services, and market offerings.