Purpose. The research aims to conduct a comparative analysis of digital consumer behavior in the United States and Ukraine to identify the necessary strategic adjustments for digital brand adaptation. The study focuses on how differences in technological infrastructure, socio-economic contexts, and cultural dimensions dictate the choice of marketing tools and communication channels when a brand operates in these two distinct environments. Methods. The study uses a comparative analysis of 2023–2025 statistical data from Statista, the NBU, and global digital reports. The approach integrates G. Hofstede’s dimensions with metrics like mobile-to-desktop ratios and e-commerce penetration to identify "technological leapfrogging" in Ukraine versus U.S. "legacy maturity". Results. The research reveals fundamental divergences: the U.S. market is characterized by a "desktop-significant" consumption model where email marketing remains the primary tool for conversion and long-term loyalty. Conversely, the Ukrainian market demonstrates a "mobile-only" dominance, where the consumer journey is centered around messenger ecosystems (Telegram, Viber). Statistical processing indicates that while U.S. consumers prioritize data privacy and brand history, Ukrainian consumers exhibit significantly higher fintech- flexibility (over 90% contactless payment adoption) and evaluate brands based on their "civic position" and wartime social responsibility. The study highlights that the U.S. consumer responds better to individualistic, self-service digital experiences, whereas the Ukrainian consumer relies heavily on community-based social proof and real-time interaction with the brand. Conclusions. Effective brand adaptation between the U.S. and Ukraine requires a total reconfiguration of the digital funnel. For the U.S. market, brands must emphasize official web presence and formal CRM systems. For Ukraine, the strategy must prioritize "messenger-commerce," high-speed mobile interfaces, and a clear socio-political stance. The research concludes that digital adaptation has moved beyond linguistic translation toward a deep alignment with the local consumer’s technological lifestyle and ethical expectations.