In the rapidly evolving landscape of mobile app development, cross-platform app development has emerged as a crucial strategy for businesses and developers aiming to efficiently reach both Android and iOS users. This approach, which allows developers to build applications using a single codebase that runs across multiple operating systems, offers significant advantages such as reduced costs, faster time to market, and simplified maintenance. Frameworks like Flutter and React Native have become popular choices due to their ability to deliver near-native user experiences and facilitate rapid prototyping. Despite the benefits, developers face challenges like performance bottlenecks, security issues, and platform-specific graphic optimization when adopting cross-platform development. Ultimately, the decision between native and cross-platform development hinges on factors such as app complexity, performance requirements, development speed, and budget, with cross-platform development offering a compelling option for expanding app reach and ensuring consistent user experience across devices.