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FrançaisA mobile app needs a secure place to store data and perform actions that should not depend on code installed on a user’s phone. Firebase and a custom API can both support parts of that work, but they are different operating models. Firebase provides managed products and SDKs; with your own API, you choose and operate the backend and its components.
What Firebase handles
Firebase offers separate products such as Authentication, Firestore, Cloud Functions, Cloud Messaging and Storage. You can combine the ones your app needs. For example, Firestore is a managed NoSQL database with real-time and offline capabilities; Cloud Functions runs backend code in response to events or HTTPS requests. You do not install a virtual machine to operate those services. Check the Firebase products for Flutter and the terms for each product.
Managed does not mean security configures itself. You still need to design authentication, database rules, permissions, usage limits and project settings. App Check can help protect certain resources from abuse, but it does not replace authorization in your application.
What your own API gives you
You define routes, validation and business logic in a service you control. You choose languages and libraries, connect existing systems and select where the API and database run. That flexibility comes with operational work: deployment, updates, secrets, TLS, DNS, backups, monitoring and restore tests.
Projects can deploy compatible services from Git; it is not automatically a managed mobile database. A VPS gives you more control over software and configuration, but you operate the operating system and services yourself.
| Decision | Firebase | Your API |
|---|---|---|
| Runtime and managed services | Operated by Firebase for the selected products | Operated by your team or a contracted administrator |
| Data model | Choose among Firebase products and their models | Choose a database and operate or contract it separately |
| Security work | Configure rules, identities and limits | Implement and test authentication and authorization in the API |
| Cost | Depends on product, usage and current terms | Depends on server, data, traffic and operational work |
Choose Firebase when its managed features fit your data and your team wants to avoid operating servers. Choose your own API when you need custom business logic, existing integrations or control of a backend contract—and have a plan to maintain it. You can also combine Firebase Authentication with an API that verifies its tokens. Define which system is authoritative for each piece of data and avoid duplicate writes without a sync strategy.
If you build an API, define routes and permissions first, deploy it behind HTTPS, keep private credentials on the server, and test access with different users. Hostbrid can run a compatible backend through Projects or a self-managed VPS. It does not provide Firebase or automatically make a mobile app secure. See the mobile app API hosting guide, Flutter API setup and React Native API setup.
If you have decided to build your own API, compare Projects or a VPS for hosting it by runtime, database and who will maintain the server.