Innovation is currently considered a fundamental factor in business development, particularly in the retail sector, which is undergoing dynamic changes resulting from evolving consumer preferences. The aim of the research is to verify the level of customer acceptance of self-checkout and mobile applications (their use in everyday shopping). Additionally, an attempt was made to determine the impact of these innovations on the perception of retail outlets’ competitiveness (their attractiveness and willingness to purchase again), taking into account consumer demographics. The study was conducted as an online survey on social media groups of retail customers. 241 respondents participated, diverse in terms of gender, age, and income. The results indicate that innovations such as self-checkout and mobile apps are enjoying significant consumer interest. Over half of respondents use them very frequently, while the remaining, though less frequently, are also regular users. Younger, lower-income individuals demonstrate greater openness to self-checkout. Mobile apps, on the other hand, are popular across all social groups. Importantly, retail establishments implementing modern solutions are perceived as more competitive, regardless of the respondents’ demographic characteristics.