Supabase vs Firebase: Open Source Postgres or Google Ecosystem?

Your database model decides everything. Supabase brings PostgreSQL power with Row Level Security; Firebase excels at offline-first NoSQL sync for mobile apps.

Supabase and Firebase serve similar use cases but with fundamentally different approaches. Supabase builds on PostgreSQL, offering the power of a full relational database with SQL, joins, transactions, and stored procedures. Row Level Security at database level provides a robust security model and the open-source architecture guarantees full control over your data. The built-in pgvector extension also makes Supabase suitable for AI applications with vector search. Firebase excels at real-time synchronization and offline support for mobile apps, with automatic conflict resolution and native SDKs for Flutter and React Native. The Google Cloud ecosystem offers supplementary services like crashlytics, A/B testing, and performance monitoring. The choice depends on your data model and deployment requirements: relational with SQL and self-hosting points to Supabase, document-based with offline-first and Google Cloud integration points to Firebase.

Supabase and Firebase backend platforms compared

Background

The Supabase vs Firebase decision is one of the most frequently asked questions when starting a new project in 2026. Both platforms offer authentication, storage, real-time functionality, and serverless functions, but their fundamental architectural differences determine which platform best fits your project. Supabase has rapidly grown to become the most popular open-source BaaS platform with over 75,000 GitHub stars and an active community. Firebase has the advantage of years of stability, Google's infrastructure, and a complete mobile development platform. The rise of AI applications strengthens Supabase's position thanks to native pgvector integration, while Firebase offers similar capabilities via Vertex AI. For teams choosing a BaaS, the question is increasingly not if but when they switch to Supabase.

Supabase

An open-source Backend-as-a-Service built on PostgreSQL that has rapidly grown to become the most popular alternative to Firebase. Supabase provides a full relational database with Row Level Security, real-time subscriptions via PostgreSQL CDC, Deno-based edge functions, and an auto-generated REST and GraphQL API via PostgREST. The platform is fully self-hostable via Docker, has over 75,000 GitHub stars, and offers built-in authentication, storage, and vector embeddings for AI applications. Supabase is supported by a growing ecosystem of client libraries for JavaScript, Flutter, Python, and Swift.

Firebase

Google's fully managed Backend-as-a-Service platform featuring Firestore as a NoSQL document database, native real-time synchronization with automatic offline caching, Authentication, Cloud Functions (Node.js and Python), Firebase Hosting, and App Check for security validation. Firebase is deeply integrated into the Google Cloud ecosystem and is used by millions of applications worldwide. The platform offers excellent support for mobile development via Flutter and React Native, with crashlytics, performance monitoring, and A/B testing as supplementary services that make it a complete platform for app development.

What are the key differences between Supabase and Firebase?

Feature	Supabase	Firebase
Database type	PostgreSQL (relational, SQL) with full SQL support, joins, transactions, and stored procedures	Firestore (NoSQL document model) with hierarchical collections, automatic indexing, and offline caching
Real-time	Real-time subscriptions via PostgreSQL CDC (Change Data Capture) with broadcast and presence channels	Native real-time synchronization with automatic offline caching and conflict resolution for mobile apps
Authentication	Built-in auth with RLS integration, 30+ OAuth providers, magic links, and phone verification	Firebase Auth with email, phone, social login, anonymous auth, and multi-factor authentication
Self-hosting	Fully self-hostable via Docker Compose, providing complete control over data and compliance	Only available as a managed service via Google Cloud, no self-hosting option available
Security model	Row Level Security at PostgreSQL level with SQL policies enforced directly in the database	Firestore Security Rules with a custom rule language evaluated on every read and write operation
Pricing	Free tier with 500 MB database and 1 GB storage, then predictable pay-as-you-go per resource	Spark plan free with limits, Blaze plan based on consumption per operation which can make costs unpredictable
Serverless functions	Deno-based edge functions with TypeScript, deployed across 30+ regions via Deno Deploy	Cloud Functions on Node.js or Python, integrated with the full Google Cloud Functions platform
AI and vector search	Built-in pgvector extension for vector embeddings and similarity search directly in PostgreSQL	Via Firebase Extensions and Vertex AI integration, but no native vector database support

When to choose which?

Choose Supabase when...

Choose Supabase when your project requires complex data relationships needing SQL queries, joins, and transactions. Supabase is ideal when you want full control over your data through self-hosting for compliance and GDPR requirements. Choose Supabase when Row Level Security at database level is essential for your security architecture. The built-in pgvector extension makes Supabase the right choice for AI applications with vector embeddings and similarity search. Choose Supabase when you want to avoid vendor lock-in and value the flexibility of an open-source platform.

Choose Firebase when...

Choose Firebase when your application requires offline-first functionality with seamless real-time synchronization and automatic conflict resolution, particularly for mobile apps. Firebase is the stronger choice when you need deep integration with the Google Cloud ecosystem, including Cloud Functions, BigQuery, Google Analytics, and Vertex AI. Choose Firebase for cross-platform mobile development with Flutter or React Native where native SDKs and supplementary services like crashlytics and A/B testing provide a complete platform. Firebase is also suitable when minimal operational management is a priority.

What is the verdict on Supabase vs Firebase?

Which option does MG Software recommend?

At MG Software, we use Supabase as our primary Backend-as-a-Service and it is deeply integrated into our development workflow. The combination of PostgreSQL, Row Level Security, and the open-source architecture aligns perfectly with our vision on data sovereignty and long-term flexibility. We build applications with Supabase edge functions for serverless logic, real-time subscriptions for live data updates, and pgvector for AI-powered features. The auto-generated REST API via PostgREST significantly accelerates our development. For clients with existing Firebase projects, we offer migration paths to Supabase, restructuring Firestore documents into relational tables and unlocking the benefits of SQL and RLS without sacrificing development speed.

Migrating: what to consider?

Migrating from Firebase to Supabase requires restructuring your data model from Firestore documents to relational PostgreSQL tables with proper schema design. Plan the migration in phases: start by designing your relational schema, then migrate authentication users via export/import, and convert Firestore Security Rules to PostgreSQL Row Level Security policies. Cloud Functions need to be rewritten as Supabase edge functions in Deno/TypeScript. Test real-time functionality thoroughly, as Supabase CDC works differently from Firestore's native synchronization. The auto-generated REST API can replace existing API calls.

Frequently asked questions

Yes, Supabase is the most popular open-source alternative to Firebase with over 75,000 GitHub stars. It offers comparable functionality such as authentication, real-time subscriptions, storage, and serverless functions, but built on PostgreSQL instead of NoSQL. This makes it particularly suitable for projects requiring complex queries, joins, and transactions. The open-source architecture additionally offers self-hosting options for full data control and GDPR compliance.

Yes, migration is possible but requires planning and restructuring your data model. Firestore documents need to be converted to relational PostgreSQL tables with proper schema design. Authentication users can be exported and imported. Firestore Security Rules must be rewritten as PostgreSQL Row Level Security policies. Cloud Functions are replaced by Supabase edge functions. Plan a phased approach and start with schema design before migrating data.

Both platforms offer generous free tiers. Supabase provides 500 MB database, 1 GB storage, and 50,000 monthly active users for free. Firebase offers 1 GiB Firestore storage and 50,000 daily reads for free. For small projects, costs are comparable. As you scale, Supabase can be more cost-effective because costs are calculated per resource rather than per operation, which can cause unpredictable costs with Firebase at high read volumes.

Row Level Security (RLS) is a PostgreSQL feature that lets you control at the row level which users can read, write, or delete data using SQL policies. In Supabase, RLS policies are enforced directly in the database, meaning security rules cannot be bypassed regardless of how data is accessed. This is more robust than Firestore Security Rules which are evaluated at the application level. RLS is essential for multi-tenant applications and projects with strict security requirements.

Supabase does not offer native offline synchronization like Firebase Firestore does. Firestore caches data automatically locally and synchronizes changes when the connection is restored. For Supabase, you can implement client-side caching with libraries like TanStack Query or SWR, but this requires more manual work. If offline-first functionality is a core requirement for your mobile app, Firebase is the better choice for this specific use case.

Yes, Supabase offers native support for vector embeddings via the pgvector extension in PostgreSQL. You can store embeddings and perform similarity search directly in your database without a separate vector database like Pinecone or Weaviate. This makes Supabase suitable for RAG (Retrieval Augmented Generation) applications, semantic search, and recommendation systems. Firebase offers similar functionality via Vertex AI integration but without native vector database support in Firestore.

Supabase is fully self-hostable via Docker Compose, providing complete control over data, compliance, and infrastructure. This is ideal for organizations with GDPR requirements or those needing to store data in specific regions. The managed service at supabase.com is the recommended choice for most projects, as Supabase handles updates, backups, monitoring, and scaling automatically. Self-hosting requires DevOps expertise and ongoing maintenance of the PostgreSQL database, edge functions, and other services.

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