ObjectBox review
A cross-platform object database for offline-first apps, with sync and vector search.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
ObjectBox is an embedded, object-oriented database for mobile, IoT, edge, desktop, and server applications. It suits teams building applications that need local data persistence, offline-first operation, object relations, and native access across multiple platforms. Supported environments include Android, iOS, Linux, Windows, macOS, Raspberry Pi, and other POSIX-compatible systems. Native APIs are available for Java, Kotlin, Dart, Flutter, Go, C, C++, Swift, and Python.
The core database is free, while ObjectBox Sync is priced per project and usage with personalized quotes. Sync adds optional bidirectional synchronization across devices and cloud or on-premise servers, making it relevant for applications that must continue operating locally and synchronize data when connected. The database also provides ACID-compliant transactions, reactive data observers and queries, and on-device vector search. That combination gives ObjectBox a broader scope than local persistence alone, although teams should account for Sync as a separate paid capability.
Its cross-platform language coverage is a strong fit for products sharing a data layer across mobile, desktop, edge, and server targets. MongoDB is the listed integration, while the platform centers on its own embedded database APIs rather than a broad integration catalog. The default C/C++ database limit is 1 GB and can be changed through configuration. Choose ObjectBox when offline operation, native APIs, synchronization, relations, and on-device search are central requirements. Consider an alternative when a wider integration ecosystem or a fixed, publicly stated Sync price is more important than embedded, local-first storage.
ObjectBox pros and cons
- Where it wins
- Offline-first persistence with bidirectional synchronization
- On-device vector search and reactive queries
- Native APIs across mobile, desktop, IoT, and server environments
- Where it doesn't
- ObjectBox Sync pricing varies by project and usage
- Its listed integration is limited to MongoDB
- The default C/C++ database limit is 1 GB before configuration changes
ObjectBox fact sheet, pricing and score →
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