Fintech mobile is a different beast from consumer mobile. PCI scope, biometric auth, certificate pinning, jailbreak detection and tightly audited dependency trees all matter — and the choice of cross-platform framework changes how easy each one is. Here’s the honest comparison from building both.
Native module surface
React Native has the broader ecosystem of fintech-grade native modules (Plaid SDK, Stripe Identity, biometric auth wrappers). Flutter is catching up but you’ll still write more platform-channel code for less common SDKs.
Secure storage and key management
Both wrap iOS Keychain / Android Keystore well. Flutter’s `flutter_secure_storage` is simpler; React Native’s `react-native-keychain` is more configurable. Either way, never store secrets in `AsyncStorage` / `SharedPreferences`.
Performance and binary size
Flutter wins on raw scroll/animation performance and consistent rendering across devices. React Native (with the new architecture) has closed most of the gap and ships smaller binaries — important for emerging-market users on low-storage devices.
Compliance and audit-ability
Auditors care about your dependency tree. React Native’s npm-based supply chain is wider but better tooled for SCA scans (Snyk, Socket). Flutter’s pub.dev is smaller but less familiar to most security teams.
Our default recommendation
For fintech, we default to React Native unless the app is animation-heavy or design-system-driven from day one — then Flutter wins. Either way, talk to us before locking in the stack.