Google Firebase Realtime Database
by Google
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What Google Firebase Realtime Database is
Google Firebase Realtime Database is a database service for web, iOS, Android, and API-based applications. It keeps data synchronized in both directions and can continue operating in offline mode on iOS and Android. When updates conflict, the service resolves them automatically. Developers can connect through SDKs for Apple platforms, Android, Flutter, JavaScript, Unity, and C++. Firebase uses a freemium model with a free Spark plan and a paid-usage Blaze plan. Spark is a no-cost plan with 1 GB of storage, 10 GB of monthly downloads, and 100 simultaneous connections. Blaze includes 1 GB of storage, approximately 10 GB of monthly downloads, and 200,000 simultaneous connections per database; usage beyond its no-cost quotas is billed. The combination of offline operation, automatic conflict handling, and bidirectional synchronization suits applications that share changing data across supported clients.
Who it suits
It suits developers building web or mobile apps that need shared, synchronized data. It is also relevant to teams wanting offline operation and SDK options across the listed development environments.
What it does well
- Bidirectional data synchronization
- Offline mode on iOS and Android
- Automatic conflict resolution
- Free Spark plan available
- SDKs for multiple languages and platforms
What to know first
- Blaze usage beyond quotas is billed
- Spark allows 100 simultaneous connections
- No plan prices are listed
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Spark | No-cost plan · 1 GB storage · 10 GB/month downloads · 100 simultaneous connections | On request |
| Blaze | Pay as you go; billed for usage beyond no-cost quotas · 1 GB included storage · Approximately 10 GB/month included downloads · 200K simultaneous connections per database | On request |
As firebase.google.com lists them, read 21 Sept 2026. The maker's own page has the final word.
Verdict
Google Firebase Realtime Database combines synchronized data, offline support, and automatic conflict handling across web and mobile clients. Its free starting plan and broad SDK coverage make it suitable when those capabilities match an application's needs.
Where Google Firebase Realtime Database stands on Freedom251
- Mobile Databases#27 of 27