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Head-to-head · Mobile Databases

Firebase Realtime Database vs ObjectBox

  • Updated Oct 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score Firebase Realtime Database #5 in Mobile Databases 8.8/10 Free plan Free plan✓ 1 of 1 features Visit Firebase
ObjectBox #7 in Mobile Databases 8.5/10 Free plan Free plan✓ 0 of 1 features Visit ObjectBox

Firebase Realtime Database leads on 0 checks, ObjectBox on 0, and 2 are even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreFirebase Realtime Database · 8.8/10
  • Free planboth
  • Most featuresFirebase Realtime Database · 1 of 1

Firebase Realtime Database scores higher on our rubric for mobile databases: 8.8 against 8.5 out of 10; our editors rank them #5 and #7.

Firebase Realtime Database is the better fit for real-time Firebase mobile applications. ObjectBox is the better fit for cross-platform apps needing local sync and vectors.

  • Firebase Realtime Database fits best

    Real-time Firebase mobile applications

  • ObjectBox fits best

    Cross-platform apps needing local sync and vectors

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Side by side

Feature Firebase Realtime Database 8.8/10 Visit ↗ ObjectBox 8.5/10 Visit ↗
At a glance
Editor score 8.8 8.5
Ranking #5 in Mobile Databases #7 in Mobile Databases
Best for Real-time Firebase mobile applications Cross-platform apps needing local sync and vectors
Pricing model Free plan + paid Free plan + paid
Starting price — Free plan
Free plan ✓ ✓
Free trial — —
Deployment Cloud Cloud, Self-hosted, Desktop, Mobile
Platforms Web, iOS, Android Windows, macOS, Linux, iOS, Android
Support Email, Tickets, Community, Docs Email, Community, Docs
Integrations 2 integrations 1 integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Firebase Realtime Database 1/1 · ObjectBox 0/1
Offline mode ✓ (best) Not checked yet
Specs
Data synchronization Bidirectional Not checked yet
Mobile platforms iOS and Android Not checked yet
Conflict resolution Automatic Not checked yet
SDK languages Apple platforms, Android, Flutter, JavaScript, Unity, C++ Not checked yet
Monthly sync limit Not checked yet Not checked yet
Our review
Pros
  • Real-time bidirectional JSON synchronization across connected clients
  • Offline caching, queued writes and automatic conflict merging
  • SDKs, REST access, Security Rules and Cloud Functions integration
  • Offline-first persistence with bidirectional synchronization
  • On-device vector search alongside reactive queries and transactions
  • Native APIs across mobile, desktop, and server environments
Cons
  • Spark limits usage to 1 GB stored data and 100 simultaneous connections
  • Blaze uses usage-based billing rather than a fixed subscription
  • Web offline persistence does not continue beyond the session
  • ObjectBox Sync is priced by project and usage
  • The default C/C++ database limit is 1 GB
  • Its integration list includes MongoDB rather than a broad ecosystem
Our verdict

Firebase Realtime Database is a cloud-hosted NoSQL database for mobile and web applications that stores data as JSON and synchronizes updates across connected clients in real time. It is designed for developers building Firebase…

Read the review →

ObjectBox is an embedded, object-oriented database for mobile, IoT, edge, desktop, and server applications. It is designed for applications that need local data persistence, offline-first operation, and optional synchronization across…

Read the review →
  1. Firebase Realtime DatabaseMobile Databases 8.8Free plan
  2. ObjectBoxMobile Databases 8.5Free plan

Strengths and trade-offs

  • Firebase Realtime Database — where it wins

    • Real-time bidirectional JSON synchronization across connected clients
    • Offline caching, queued writes and automatic conflict merging
    • SDKs, REST access, Security Rules and Cloud Functions integration

    Where it doesn't

    • Spark limits usage to 1 GB stored data and 100 simultaneous connections
    • Blaze uses usage-based billing rather than a fixed subscription
    • Web offline persistence does not continue beyond the session

  • ObjectBox — where it wins

    • Offline-first persistence with bidirectional synchronization
    • On-device vector search alongside reactive queries and transactions
    • Native APIs across mobile, desktop, and server environments

    Where it doesn't

    • ObjectBox Sync is priced by project and usage
    • The default C/C++ database limit is 1 GB
    • Its integration list includes MongoDB rather than a broad ecosystem
  • Firebase Realtime Database8.8/10 · Free plan

    A strong fit for Firebase apps that need real-time sync and offline mobile access.

    Visit FirebaseFull verdict →
  • ObjectBox8.5/10 · Free plan

    A flexible local-first database for cross-platform apps that need sync and on-device vectors.

    Visit ObjectBoxFull verdict →

More comparisons

All mobile databases comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update