PurposeWith the rapid growth of the Internet and the wide acceptance of e-commerce, online impulse buying is rising; however, the consumer motivation to buy impulsively within the digital setting calls for continuous exploration. Through the lens of cognitive appraisal theory, the authors aim to explore the relevance of web quality factors (cognitive processes) and hedonism (emotional response) for online impulse buying in the cross-cultural context of India and Croatia. The study also attempts to investigate the varying effects of sales promotion and payment options (cognitive processes) on the relationship between hedonism and online impulse buying.Design/methodology/approachThe researchers in the present study have adapted the refined eTailQ scale along with factors like hedonism, sales promotion and payment options determining impulse buying—the measurement instrument comprised of a highly structured questionnaire covering consumers' attitudes and opinions regarding the explored concepts. A total of 526 responses were generated in the data collection process, wherein 264 were from India and 262 were from Croatia.FindingsThe results reveal that not all web quality determinants affect impulse buying similarly. Web informativeness significantly, but negatively, impacts impulse buying only regarding Croatian consumers, while customer service influences impulse buying in the Indian market. Web layout and privacy do not influence impulse buying. However, besides hedonism's direct impact on impulse buying in both countries, the results show that the influences of web layout and privacy on impulse buying are mediated via hedonism. Given the varying effects, this study shows that, unlike the payment options, only sales promotion represents a significant moderator that enhances the relationship between hedonism and impulse buying in both countries.Originality/valueThis study utilises cognitive appraisal theory to compare the effects in two countries through cognitive appraisals, emotional responses, and situational factors for explaining online impulse buying behaviour. The study also offers practical managerial implications.