PostgreSQL vs Supabase vs Firebase vs MongoDB: Use Cases for 2026 Web Development Kashaf Abdullah · 3 min read · Jan 13, 2026 Use Cases for 2026 Web Development PostgreSQL, Supabase, and Firebase serve distinct roles in modern web apps, with PostgreSQL offering robust relational capabilities, Supabase providing a Firebase-like BaaS on PostgreSQL, and Firebase enabling quick NoSQL real-time setups. These choices align well with MERN stack projects, complementing MongoDB for flexible schemas while adding SQL power for complex queries. Include MongoDB for comparison, as it's popular for scalable, document-based apps like your OLX clones. Core Features PostgreSQL excels in ACID compliance, complex SQL queries with joins, and rich data types like JSONB for hybrid use. Supabase builds on PostgreSQL with real-time subscriptions, built-in auth, and edge functions, offering open-source flexibility without vendor lock-in.…