Supabase vs Firebase: differences and when to choose each one

Published on 2026-10-17 by frfrand

Comparación técnica y sencilla de Supabase y Firebase para elegir backend según datos, autenticación, precios y necesidades.

Supabase and Firebase often come up together when someone asks “what backend should I use for my new app?”. Both can save you a lot of work, but they are not built around the same decisions.

The best-known difference is that Supabase relies on PostgreSQL, a relational database, while Firebase offers several options, including Cloud Firestore, which is document-based. That difference conditions how you model data, queries, and relationships. But it’s not the only one.

First: what do they have in common?

Both ecosystems offer services to identify users, access information from an app, and resolve common functions without having to manage all components from scratch.

In both you can build a prototype quickly. In both you can also make security mistakes if you misconfigure permissions. Neither automatically writes a correct architecture for you.

Difference 1: the database

Supabase: each project includes PostgreSQL. If you have customers, orders, products, and related payments, you can model them with tables, keys, and SQL queries.

Firebase: Cloud Firestore uses documents and collections, something that can be convenient for certain schemas and synchronization patterns. Firebase also has other database products, so it’s worth comparing the specific service and not assuming that all of Firebase works the same way.

A simple example: you want to find a customer’s orders and group them by product. In a relational model, queries and joins between tables are part of the system. In a document model, you often design the schema around how you will query the data and the product’s capabilities.

Difference 2: users and permissions

Supabase Auth integrates with PostgreSQL’s RLS policies. Firebase Authentication identifies users and is usually combined with security rules or other checks depending on the data service.

In both cases, logging in does not automatically grant secure access to all records. Rules matter as much as the login form.

Difference 3: hosting and control

Supabase offers self-hosting options, although managing them requires maintaining several services, backups, security, and updates.

Firebase is integrated into Google Cloud’s managed ecosystem. Some of its pieces have alternatives or export mechanisms, but that is not the same as downloading all of Firebase and running it as a single official identical installation on your VPS.

If portability is a priority, this point deserves attention from day one.

Difference 4: real-time and files

Both ecosystems can solve data synchronization and file storage, but the products, security mechanisms, limits, and costs are different.

Don’t choose based on the phrase “it has real-time.” Ask yourself how many users will be connected, what data will be updated, and how much work each change requires.

Which one costs less?

There is no universal winner. It depends on operations, transfer, storage, functions, actual usage, and contracted plans. A fair comparison is made with the same app example and consumption data. Quotas change; it would make no sense to promise here that one is always cheaper.

Which one would I choose in three situations?

An application with many data relationships: I would start by evaluating Supabase and PostgreSQL.

An application highly integrated with Google services: I would evaluate Firebase and its specific products.

A system with complex business rules and a team that already masters its backend: I would consider a custom database and backend before adding a full platform.

All three are reasonable decisions if they fit the project.

What does this have to do with ArduMaker?

ArduMaker offers VPS environments and databases that allow running more customized architectures. It can be an option when you want to control your infrastructure, but that also means managing aspects that Supabase or Firebase can handle as a service.

In summary: don’t just ask «which is better?». Ask «what data do I have, what rules do I need, how much control do I want, and what can I maintain?». The answer often appears long before comparing logos.

Sources: Supabase and Firebase.