Both Supabase and Firebase offer compelling backend solutions. Here's how they stack up in 2026.
Database
Supabase uses PostgreSQL -- a full relational database with SQL, joins, and pgvector for AI embeddings. Firebase uses Firestore, a NoSQL document database.
Authentication
Both offer comprehensive auth solutions. Supabase supports Row Level Security for fine-grained access control. Firebase uses Security Rules.
Real-time
Both support real-time subscriptions. Firebase's real-time performance has a slight edge at scale.
Pricing
Supabase is generally cheaper for most use cases, especially with its generous free tier. Firebase can get expensive with high read/write volumes.
Our Verdict
Choose Supabase if you want SQL, pgvector, or open source. Choose Firebase if you're deeply invested in the Google Cloud ecosystem.