Convex vs Firebase — The Database That Codes vs The Kitchen Sink

Convex gives you a reactive database with TypeScript-first functions. Firebase is Google's everything-but-the-kitchen-sink platform. One's a scalpel, the other's a Swiss Army knife.

Different Philosophies, Different Weight Classes

Convex is a reactive backend-as-a-service built around a single, consistent database with built-in real-time sync and serverless functions. It's designed for developers who want to write full-stack TypeScript without managing infrastructure. Firebase is a suite of 18+ products (Firestore, Auth, Cloud Functions, etc.) glued together by Google's ecosystem. Convex is a precision tool for data-heavy apps; Firebase is a platform trying to be everything to everyone.

If you're building a real-time dashboard, chat app, or collaborative tool, Convex feels like magic. If you need authentication, file storage, analytics, and ML APIs out of the box, Firebase has you covered—but you'll pay in complexity and vendor lock-in.

Where Convex Wins

Convex's killer feature is its reactive queries. You define a query in a server function, and the client automatically gets updates when the data changes—no manual subscription management. It's like React for your database. Pricing is straightforward: $25/month for the Pro tier (unlimited functions, 10GB database), with a generous free tier that includes 1M function calls/month.

Its TypeScript-first approach means you get end-to-end type safety from database schema to client. You write functions that feel like local code, and Convex handles deployment, scaling, and real-time sync. For real-time apps, it cuts development time in half compared to Firebase's piecemeal setup.

Where Firebase Holds Its Own

Firebase's strength is its ecosystem breadth. Need authentication? Use Firebase Auth with 10+ providers. File storage? Cloud Storage with CDN. Analytics? It's built in. The free Spark plan is generous (1GB database, 10GB storage), and the Blaze plan is pay-as-you-go, which can be cheaper for low-traffic apps.

Firestore (Firebase's database) has a massive user base and deep Google Cloud integration. If you're already using Google services or need non-real-time features like ML APIs, Firebase is hard to beat. Its real-time capabilities are solid, but they require manual setup—you're managing listeners and handling connection states yourself.

The Gotcha: Switching Costs and Lock-In

With Firebase, you're locked into Google's ecosystem. Migrating off Firestore is a nightmare because of its proprietary query language and data model. Convex uses a SQLite-compatible database, so you can export your data and run it anywhere. But Convex's real-time magic is proprietary—if you leave, you lose the automatic sync.

Firebase's pricing can explode unexpectedly on the Blaze plan if you get a traffic spike. Convex's Pro tier is flat-rate, so you know your costs upfront. However, Convex is newer and has fewer third-party integrations—you won't find a Zapier connector here.

If You're Starting Today...

If you're building a real-time app with complex data relationships (think multiplayer game, trading platform, or collaborative editor), choose Convex. Write your schema in TypeScript, deploy functions with npx convex deploy, and watch data sync automatically. Use its built-in scheduling and cron jobs for background tasks.

If you need authentication, file storage, and analytics from day one, and real-time is a secondary feature, go with Firebase. Start with the Spark plan, use Firestore for data, and add Cloud Functions for server logic. But be prepared to write more boilerplate for real-time updates.

What Most Comparisons Get Wrong

Most reviews treat these as direct competitors—they're not. Convex is a database that codes, designed for real-time sync first. Firebase is a platform that includes a database. The real question isn't which is better, but what's the core of your app?

If it's real-time data, Convex's reactive model saves weeks of development. If it's a mix of features (auth + storage + analytics), Firebase's suite makes sense. But don't choose Firebase just for real-time—you'll end up writing more code than with Convex.

Quick Comparison

Factor	Convex	Firebase
Database Type	SQLite-compatible with real-time sync	NoSQL (Firestore) with optional real-time
Pricing (First Paid Tier)	$25/month flat (Pro plan)	Pay-as-you-go (Blaze plan, ~$0.18/GB)
Free Tier	1M function calls/month, 1GB database	1GB database, 10GB storage (Spark plan)
Real-Time Setup	Automatic via reactive queries	Manual listeners & subscription management
Authentication	Third-party only (e.g., Clerk, Auth0)	Built-in (Firebase Auth)
Type Safety	End-to-end TypeScript	Partial (Firestore has basic typing)
File Storage	Not included (use S3 or similar)	Built-in (Cloud Storage)
Serverless Functions	Built-in, TypeScript-first	Cloud Functions (Node.js, Python, etc.)

The Verdict

Use Convex if: You're building a real-time app and want TypeScript end-to-end without managing infrastructure. Think collaborative tools, dashboards, or games.

Use Firebase if: You need authentication, file storage, and analytics out of the box, and real-time is a nice-to-have. Ideal for MVPs or apps tied to Google Cloud.

Consider: Supabase if you want PostgreSQL with real-time and built-in auth—it's like Convex and Firebase had a baby, but with SQL.

The Bottom Line

Convex wins

Convex wins because it makes real-time data feel like local state. You write TypeScript functions that automatically sync data to the client—no websocket wrangling, no manual subscriptions. Firebase's real-time is bolted on; Convex's is the foundation.

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