When deciding which platform to cater to, consider factors like target audience, market share, development costs, and monetization potential. Creating an iPhone app involves using Apple's development tools and programming languages, such as Swift or Objective-C. You'll need a macOS device, access to Xcode (Apple's integrated development environment), and an Apple Developer account. Focus on adhering to Apple's Human Interface Guidelines to ensure a seamless user experience and a higher chance of approval when submitting your app to the App Store. On the other hand, developing an Android app requires using Java or Kotlin as programming languages, along with Android Studio, Google's official development environment. Android app development offers more flexibility in design and customization but can be more challenging due to the variety of devices and screen sizes. Google's Material Design guidelines can help you create an app that meets user expectations and fits well within the Android ecosystem. Alternatively, you can consider cross-platform development tools like React Native or Flutter, which allow you to create a single codebase that runs on both iOS and Android, potentially saving time and resources.