The framework question comes up early in almost every mobile project, and it gets asked before the more important question: what does this specific app actually need to do. Framework choice should follow from the product requirements, not the other way around. Here is how the three main options actually compare.
React Native
React Native gives you access to the largest mobile developer talent pool, since it is built on JavaScript and shares patterns with web React development. It delivers platform-authentic UIs and has matured considerably, with its newer architecture now standard in current builds. It tends to be the faster starting point for consumer-facing apps with familiar UI patterns.
Flutter
Flutter uses Dart, a language most teams have less existing familiarity with, but it delivers pixel-perfect visual consistency across iOS and Android and strong animation performance. It tends to suit business applications where a single, tightly controlled visual design matters more than platform-native look and feel.
Fully Native (Swift and Kotlin)
Native development, separate codebases for iOS and Android, remains the right choice when an app depends heavily on the camera, AR, complex device sensors, or bleeding-edge platform features the day they ship. It is also the most expensive path, since two codebases roughly double the ongoing engineering surface area compared to a single cross-platform codebase.
What This Actually Costs
Both cross-platform frameworks typically save 30% to 60% compared to building separate native codebases for iOS and Android, largely by avoiding duplicated engineering work across two platforms. That savings narrows somewhat at the individual developer-rate level, since senior Flutter and React Native talent both command competitive rates, but the codebase-duplication savings still dominate the total project cost for most apps.
How to Actually Decide
Choose native only if your app genuinely depends on hardware access or platform features that a cross-platform layer cannot reliably reach. Choose Flutter when a single, consistent visual design across both platforms matters more than platform-native conventions, common for internal business tools and branded consumer apps. Choose React Native when you want the widest available talent pool and a UI that should feel native to each platform's own conventions. For most business apps without extreme hardware demands, either cross-platform option outperforms native on total cost and time to launch.