Developing a retail app like Walmart involves a detailed process, including market research, feature integration, and design. Costs range from $50,000 to $300,000 or more, depending on complexity, platform (iOS, Android, or both), and additional features like AI recommendations or payment gateways. Factors like development team expertise, geographic location, and timelines also influence pricing. Investing in robust technology ensures scalability, offering a seamless shopping experience akin to Walmart's massive retail platform.