For most iOS-only apps, Core Data is the stronger long-term choice because it plugs directly into CloudKit and SwiftUI without extra glue code, while Realm stays the faster starting point when the same codebase also needs to run on Android or other platforms. MongoDB acquired Realm in 2019 for $39 million and kept it as an open-source object database, while Core Data has shipped as Apple's native persistence framework on iOS since 2009.
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