A developer switched from Firebase to Supabase, driven by a need for a robust PostgreSQL database and more affordable real-time capabilities. The author found Firebase's NoSQL document store limiting for complex data relations, while Supabase offered a full relational database instance for free on its basic tier.

The cost structure was the deciding factor. Firebase's pay-per-read model creates unpredictable bills, especially for apps with high user engagement. Supabase charges for bandwidth instead of operations, making it roughly 75% cheaper for medium-sized apps. Its real-time features, powered by PostgreSQL's Write-Ahead Log, offer event subscriptions without the same cost penalties.

Beyond pricing, Supabase's open-source nature eliminates vendor lock-in. Developers can self-host their PostgreSQL database if they leave the platform, unlike with Google's closed Firebase ecosystem. For projects requiring relational data, predictable billing, and scalable real-time features, Supabase presents a compelling alternative to the industry standard.