We compared the top embedded databases for mobile apps — Turso (Edge SQLite), SQLite, ObjectBox, Realm, and Couchbase Lite — across footprint, sync, data model, and AI/vector support. Turso takes the top spot for modern offline-first apps that need edge-cloud sync.
Modern mobile apps can't afford to be useless when the network drops. Embedded databases — databases that run inside your app process with no separate server — are the foundation of offline-first architecture. They cut latency to zero for local reads, protect user privacy by keeping data on-device, and make your app feel instant.3
The trade-off? You have to pick the right one. Relational vs NoSQL. Local-only vs sync. And increasingly: does it support on-device vector search for AI features?
Here's how the top contenders stack up.
Turso takes the #1 spot because it solves the hardest problem in mobile databases: keeping a local SQLite database in sync with the cloud, at the edge.1
Built on libSQL (an open-source fork of SQLite), Turso gives you full SQL compatibility locally while replicating to edge-hosted databases around the world. For mobile apps that need both offline capability and multi-device sync, this is the sweet spot.
SQLite is the most deployed database engine in the world — every smartphone ships with it.2 It's zero-dependency, serverless, and rock-solid for relational data. If your app's data model is well-structured and you don't need sync, SQLite is still the right call.
ObjectBox is a high-performance NoSQL database built specifically for edge devices. It stores objects directly (no ORM needed) and offers built-in vector search for on-device AI — think semantic search, recommendations, and image similarity on your phone.1
Realm (now under MongoDB) pioneered the object-oriented approach where your data model classes are the database schema. It's popular among mobile developers who want to avoid SQL boilerplate, though its sync story has evolved significantly since MongoDB's acquisition.2
Couchbase Lite is built for enterprise-grade offline-first apps that need robust peer-to-peer and central synchronization. It's heavier than the others but offers the most mature conflict resolution and replication engine.1
| If you need… | Pick… |
|---|---|
| Full SQL + edge-cloud sync | Turso |
| Simple, reliable local SQL | SQLite |
| NoSQL + on-device vector AI | ObjectBox |
| Object-oriented simplicity | Realm |
| Enterprise sync & conflict resolution | Couchbase Lite |
Embedded databases are no longer just about storing rows locally. The next generation — led by Turso — combines the reliability of SQLite with modern sync and edge capabilities. For most new mobile projects in 2025, start with Turso and fall back to SQLite if you don't need sync. If you're building AI features on-device, ObjectBox's native vector support is worth a serious look.
Disclosure: As an Amazon Associate and affiliate partner, we may earn from qualifying purchases. Our recommendations are based on technical merit, not commissions.
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