best local-first databases for offline-ready apps in 2025

the local-first shift

For years, "offline support" meant caching API responses and showing a sad cloud icon when the network dropped. Local-first flips that: the client device is the primary source of truth, the database runs locally, and sync to the cloud happens in the background. The result is 0ms reads, instant UI updates, and apps that work whether you're on a subway or a mountain.1

The biggest enabler? Full databases now run directly in the browser via WebAssembly. SQLite in WASM, IndexedDB-backed sync engines, and CRDT-based conflict resolution have turned the browser into a first-class database runtime.2

the landscape: three categories

Not all local-first tools are the same. They fall into three buckets:

sync engines (Zero, PowerSync)

These sit on top of your existing Postgres database and handle the replication layer. You keep your current backend; they add real-time sync and local state management. Great for teams migrating an existing app to offline-first without rewriting the data layer.1

client databases (InstantDB, Turso)

These are databases designed from the ground up for local-first. Turso uses embedded SQLite replicas at the edge for 0ms reads. InstantDB is a relational Firebase alternative — schema-based, real-time, and offline by default. Best for greenfield projects.1

backend-as-a-service (PocketBase, Appwrite)

Full-stack backends that include built-in databases, auth, file storage, and real-time capabilities. PocketBase is a single Go binary with embedded SQLite. Appwrite is more feature-rich with a larger ecosystem. Both can serve as the sync backend for offline-capable apps.1

our picks

1. turso — edge-first sqlite with embedded replicas

Turso is built on libSQL (an open-source fork of SQLite) and designed for edge computing. The killer feature: you create embedded replicas that live on your users' devices or at the edge, giving you 0ms reads with automatic sync to the primary database. It's the gold standard for local-first SQLite replication.1

For apps that need real-time collaboration, Turso pairs well with CRDT-based sync strategies. Partial replication means you only sync the data each user actually needs — critical for performance at scale.1

Best for: Apps that need SQLite compatibility with edge deployment and offline reads.

2. pocketbase — simple sqlite backend

PocketBase is a single Go binary that gives you SQLite, real-time subscriptions, auth, and file storage — all in one file. It's absurdly simple to deploy (one binary, no dependencies) and the embedded SQLite database can be synced for offline use.1

The real-time subscriptions API makes it straightforward to build collaborative features. For indie developers and small teams who want a backend that "just works" and can be extended with custom Go code, PocketBase is hard to beat.1

Best for: Solo devs and small teams wanting a simple, self-hosted backend with real-time capabilities.

3. appwrite — full-featured open-source backend

Appwrite is a comprehensive open-source backend platform. It provides database, auth, storage, functions, and messaging — all the infrastructure you need for offline-capable apps. Its real-time API and built-in database make it a solid choice for teams that want a managed-feel backend they can self-host.1

Appwrite's database supports relationships, indexes, and permissions, giving you more structure than PocketBase's SQLite. The trade-off is more complexity and resource usage.1

Best for: Teams that need a full backend platform with auth, storage, and structured data.

why this matters: crdts, wasm sqlite, and partial replication

Three technologies make local-first practical in 2025:

• CRDTs (Conflict-free Replicated Data Types) let multiple clients edit the same data concurrently and merge changes automatically — no "last writer wins" data loss.1
• WASM-based SQLite (PGlite, libSQL) runs a full SQL database inside the browser. No server round-trip for reads.2
• Partial replication ensures devices only sync the subset of data they need. Without it, a mobile app syncing a 10GB database becomes unusable.1

the bottom line

If you're starting fresh, Turso gives you the best local-first SQLite experience with edge deployment. If you want a simple self-hosted backend, PocketBase is a delight. For teams needing a full platform, Appwrite delivers. And if you already have Postgres and need to add sync, watch the Zero and PowerSync space — that's where the ecosystem is heading.1

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