Supabase vs Firebase: The Complete Guide

Supabase vs Firebase: The Complete Comparison

Both are Backend-as-a-Service platforms, but with fundamental differences in approach.

The Core Difference

Supabase: PostgreSQL-based, open source, SQL Firebase: NoSQL (Firestore), Google-owned, proprietary

Feature Comparison

| Feature | Supabase | Firebase | |---------|----------|----------| | Database | PostgreSQL | Firestore (NoSQL) | | Auth | ✅ Social, email, etc. | ✅ Social, email, etc. | | Real-time | ✅ Subscriptions | ✅ Real-time DB | | Storage | ✅ S3-compatible | ✅ Cloud Storage | | Functions | Edge Functions | Cloud Functions | | Hosting | No (use Vercel, etc.) | ✅ Hosting included | | Analytics | No (use external) | ✅ Built-in | | Open source | ✅ Yes | ❌ No |

Database: SQL vs NoSQL

Supabase (PostgreSQL)

• Full SQL power (joins, views, transactions)
• Row-level security policies
• Foreign keys and relationships
• Mature, battle-tested

Best for: Complex queries, relational data, data integrity

Firebase (Firestore)

• Document-based NoSQL
• Real-time by default
• Simple queries only
• No joins (denormalize data)

Best for: Simple data, real-time apps, rapid prototyping

Pricing Comparison

Supabase

• Free: 500MB database, 2 projects
• Pro: $25/mo (8GB database, more compute)
• Predictable pricing, no surprise bills

Firebase

• Free: Generous but limited
• Pay-as-you-go: Complex pricing
• Can spike unexpectedly with reads/writes

Verdict: Supabase pricing is simpler. Firebase can get expensive.

Developer Experience

Supabase

• Clean, modern dashboard
• Great documentation
• SQL knowledge helpful
• REST + GraphQL APIs
• Type generation

Firebase

• Feature-rich console
• Extensive documentation
• NoSQL learning curve
• Strong mobile SDKs
• Google ecosystem integration

When to Choose Supabase

• You know SQL or want to learn
• Data has complex relationships
• You want open source (no lock-in)
• Predictable pricing matters
• Building SaaS or web apps

When to Choose Firebase

• Building mobile apps (iOS/Android)
• Already in Google Cloud ecosystem
• Simple data structures
• Need hosting + analytics bundled
• Real-time is critical

Migration Considerations

Supabase → Firebase: Difficult

• SQL to NoSQL is a major change
• Data restructuring required

Firebase → Supabase: Moderate

• NoSQL to SQL is easier
• Tools exist for migration

With Spawned

Spawned uses Supabase by default because:

• SQL is more powerful for apps
• Open source aligns with our values
• Predictable pricing for builders
• Great developer experience

When you build on Spawned, Supabase is automatically configured with:

• Database tables
• Row-level security
• Authentication
• API endpoints

The Bottom Line

Supabase for: Web apps, SaaS, complex data, SQL lovers Firebase for: Mobile apps, real-time, Google ecosystem

Both are excellent. Supabase is the modern choice for most web applications.