Both frameworks let you build for iOS and Android from a single codebase, but they take meaningfully different approaches with different trade-offs.
Flutter compiles to native code and renders its own UI components, giving it more consistent performance and pixel-perfect design control across platforms. React Native uses native platform components under the hood, which can mean better platform-native feel but more variability between iOS and Android behavior.
React Native has the advantage of a JavaScript codebase, valuable for teams with existing web development expertise. Flutter's Dart language has a smaller talent pool but a more unified, predictable development experience.
Neither is objectively better — the right choice depends on your team's existing skills and how much platform-specific customization your app needs. Cantonet Technologies works in both and helps clients choose based on their actual situation.