Smartphones have become integral to communication and entertainment, leading developers to create a wide range of apps tailored for either Android or iOS operating systems. This development can be approached in two ways: native, which focuses on a specific operating system, and cross-platform, which targets multiple systems from a single codebase. Native apps often deliver superior performance, security, and user experience as they are optimized for specific platforms using languages like Java, Kotlin, Objective-C, or Swift. However, they can be costly and time-consuming due to the need for separate development teams. Cross-platform apps, using frameworks like React Native, Flutter, and .NET MAUI, offer cost-effectiveness and quicker development by allowing code reuse across platforms but may suffer from lower performance and delayed access to new platform features. The decision between native and cross-platform development should consider factors such as audience, budget, timeline, performance, and security needs. While cross-platform apps are ideal for rapid market entry, native apps are preferable for applications requiring high security and performance. Ultimately, the choice depends on the specific requirements and future plans of the mobile app project.