MongoDB Realm's deprecation has led developers to seek alternatives that support offline-first and real-time sync capabilities in their apps. Supabase offers several tools and integrations for this purpose, including Legend-State, a local-first state management solution; WatermelonDB, a high-performance offline database for React Native apps; PowerSync, an offline-first Supabase integration with intelligent conflict handling; Replicache, which enhances real-time syncing capabilities; and ElectricSQL, a tool that simplifies automatic sync for offline-first applications. These options can help developers transition from MongoDB Realm while maintaining performance and consistency during network outages.