In recent days, InsurTech services and users are growing rapidly worldwide. InsurTech, a combination of 'insurance' and 'technology', as an area of Fintech has become an essential innovation strategy of insurance companies. Even if InsurTech services and users are prevalent, there is a lack of empirical research on determinants of user acceptance of InsurTech. The objective of this study is to explore factors determining user acceptance of digital insurance platform services most popular within InsurTech in South Korea. The research model was derived from mainly three theories: the unified theory of acceptance and use of technology (UTAUT), information systems success model (ISSM) and innovation diffusion theory (IDT) with service characteristic factors (system quality, information quality, and service quality) and user characteristic factors (personal innovativeness, self-efficacy, and perceived risk). 249 survey responses from South Korea were analysed. According to the results, information quality exhibited an effect on performance expectancy and effort expectancy whereas service quality was shown to affect only effort expectancy. Furthermore, personal innovativeness affected performance expectancy, effort expectancy, and social influence, self-efficacy exhibited an effect on performance expectancy, and perceived risk affected performance expectancy and effort expectancy.