Clerk vs. Firebase Authentication for Expo

Expo's integration with authentication providers like Clerk and Firebase presents a nuanced landscape for developers, particularly with the release of Expo SDK 53 which affected Firebase's compatibility due to Metro bundler changes. Clerk, an Expo-first SDK, offers a streamlined setup with prebuilt UI components, passkeys, and organizational tools, focusing solely on authentication. In contrast, Firebase is part of Google's broader backend-as-a-service ecosystem, providing a more general suite of services with less emphasis on authentication. This difference in focus becomes apparent in the need for Firebase's manual configuration for persistence and custom UI development. Firebase's two-path SDK—JS SDK for basic features and React Native Firebase for comprehensive native features—adds complexity, especially in maintaining compatibility with Expo's frequent updates. While Firebase requires workaround configurations for recent Expo SDK releases, Clerk's stability and native integration make it appealing for those prioritizing robust auth features in new projects. However, Firebase's broader ecosystem and established infrastructure might still be preferable for those deeply embedded in Google's services. Ultimately, the choice between Clerk and Firebase hinges on the specific needs of a project, including the importance of prebuilt features, organizational support, and ease of integration with existing systems.