Blog · 10 November 2026
Supabase vs Firebase: Choosing a Backend for Your App
Supabase and Firebase compared on data model, pricing, lock-in and real-time features, and how we choose a backend for client portals and custom apps.
When a client needs more than a website, such as a customer portal, a booking system or an internal tool, it needs a backend. That means a database, user logins, file storage and server logic. Supabase and Firebase both give you all of that without running your own servers. They make very different trade-offs, though.
The short answer
- Supabase for most business apps: structured data with relationships (customers, orders, invoices), reporting, and a database you can take with you.
- Firebase for mobile-first apps that live inside Google’s ecosystem, need offline sync, or rely on push notifications and Google’s analytics.
The core difference: how your data is stored
| Supabase | Firebase | |
|---|---|---|
| Database | PostgreSQL (relational, SQL) | Firestore (document, NoSQL) |
| Relationships and reporting | Natural: joins and SQL | Harder: data is duplicated across documents |
| Access rules | Row-level security in the database | Security rules in Firebase |
| Real-time updates | Yes | Yes, plus strong offline sync on mobile |
| Pricing model | Mostly fixed monthly tiers | Mostly pay per read, write and download |
| Leaving later | Standard Postgres: export and move | Proprietary: a rewrite to move |
| Self-hosting | Possible (open source) | No |
Business data is usually relational. A customer has orders, an order has line items, and an invoice belongs to a customer. Postgres is built for exactly that, and anyone who knows SQL can query it. Firestore stores documents, which is fast and flexible for app screens but awkward when you need reports across your data.
Google has added a Postgres option to Firebase (Data Connect, built on Cloud SQL), which narrows the gap. It’s newer, though, and ties you to Google Cloud.
Cost: predictable or usage-based
Supabase charges a fixed monthly price per project, with usage limits, so costs are easy to predict. Firebase charges for each document read and write. That’s very cheap for small apps, but a busy app, or one inefficient screen that reads too much data, can produce a surprising bill.
Both have generous free tiers for prototypes. Check current limits before you launch.
When we pick Supabase
- Client portals and dashboards that show orders, projects or invoices.
- Apps that need reporting, or that feed data into a CRM or BI tool.
- Projects where the client wants to own their data and keep the option to move it.
- Automations: n8n and Make connect to Postgres directly.
When we pick Firebase
- Mobile apps that must work offline and sync later.
- Apps that depend on push notifications, Google sign-in and Google Analytics working together.
- Teams already invested in Google Cloud.
Next step
Planning a portal or custom app? Tell us what it needs to do and we’ll recommend a stack, or read about how we connect your systems.