Supabase MCP vs Firebase MCP: Which Backend Server Should You Use?

Both Supabase and Firebase have official MCP servers that let your AI assistant talk directly to your backend. But they serve different developer profiles -- one is lean and SQL-powered, the other is broad and service-rich. This guide compares them side by side so you can pick the right one for your project.

graph TD
    A{What backend?} -->|Supabase / PostgreSQL| B[Supabase MCP]
    A -->|Firebase / Firestore| C[Firebase MCP]
    A -->|Need SQL & migrations| B
    A -->|Need Crashlytics / FCM| C
    A -->|Both platforms| D[Run both -- use Firebase --only flag]
    A -->|Choosing a new backend| E{Priority?}
    E -->|Database control| B
    E -->|Service breadth| C

Setup

Supabase MCP

One env var. Generate token from your Supabase dashboard.

{
  "mcpServers": {
    "supabase": {
      "command": "npx",
      "args": ["-y", "@supabase/mcp-server-supabase"],
      "env": {
        "SUPABASE_ACCESS_TOKEN": "your-access-token"
      }
    }
  }
}

Firebase MCP

Requires Firebase CLI login. Optionally scope with --only to limit tools.

{
  "mcpServers": {
    "firebase": {
      "command": "npx",
      "args": ["-y", "firebase-tools@latest", "mcp"]
    }
  }
}

Limit to specific services: add "--only", "firestore,auth,storage" to args.

Token Budget

Supabase MCP: ~12,875 tokens (25 tools). Firebase MCP: ~25,000+ tokens (50+ tools). Firebase is roughly double the cost.

Running Supabase + GitHub + Stripe together: ~33,000 tokens. Swap Supabase for Firebase: ~45,000+. Firebase's --only flag helps -- if you only need Firestore and Auth, the overhead drops significantly. Supabase does not offer selective loading.

What Supabase MCP Does Better

• SQL and migrations -- run raw queries, create migrations, manage schema. Firebase is NoSQL, so this entire category does not exist.
• Database branching -- create dev branches, test migrations, merge when ready. No Firebase equivalent.
• Simplicity -- one env var, 25 focused tools, predictable token cost.
• Postgres power -- complex joins, CTEs, window functions, full-text search.

What Firebase MCP Does Better

• Service breadth -- Firestore, Auth, Storage, Cloud Messaging, Crashlytics, Remote Config, App Hosting, Data Connect, Cloud Functions in one server.
• Crashlytics -- ask "what are the top crashes this week?" and get answers inline.
• Cloud Messaging -- compose and send push notifications from your editor.
• Selective loading -- --only flag lets you run a lean server with just the tools you use.

Which One?

Choose Supabase MCP if: you use Postgres, want migration-driven development, value lower token overhead, or want a focused tool set.

Choose Firebase MCP if: you are already on Firebase, need mobile features like Crashlytics or FCM, or want broad Google Cloud integration.

Use both if: your project uses Supabase for the database and Firebase for auth or push notifications. Run Firebase with --only to limit overlap. Combined: ~38,000 tokens -- workable on a 200K window.

The Bottom Line

Supabase MCP is lean, SQL-powered, and built for direct database control. Firebase MCP is broad, service-rich, and built for the Google ecosystem. For new projects optimizing for AI-assisted development, Supabase MCP currently offers the tighter integration -- SQL queries, migrations, and database branching through your assistant is a workflow Firebase's NoSQL model cannot match.

Related Posts

• How to Use the Supabase MCP Server -- deep dive on Supabase MCP
• Postgres MCP vs SQLite MCP vs MySQL MCP -- database server comparison
• Best MCP Servers for Backend Developers -- full backend stack
• Best MCP Servers for Indie Hackers -- lean startup stack
• Best MCP Servers for Fullstack Developers -- end-to-end development
• Best MCP Servers for NextJS + Supabase -- Supabase-specific stack
• Best MCP Servers for React + Firebase -- Firebase-specific stack
• Cut Your MCP Token Costs -- keep your context window lean