Bi-directional sync between Postgres and SQLite

In plain words

PowerSync is a bi-directional sync engine that synchronizes data between Postgres databases and SQLite instances, enabling offline-first application architectures. It supports Flutter, React Native, and web applications using WebAssembly SQLite, with additional client SDKs in development. The product evolved from a sync system used in production since 2009 and is designed to work independently of application stack choices.

written from the facts on this page · September 2026

From the sources

Automatically sync Postgres, MongoDB, MySQL, SQL Server, or Azure DocumentDB (alpha) with in-app SQLite.

Automatically sync your backend database with in-app SQLite. Avoid the complexities of using APIs to move app state over the network. PowerSync is a sync engine that consists of two components: a service that enables high-scalability partial data syncing and a set of client SDKs that manage client-side persistence, consistency, reactivity and syncing write operations back. Connect the most capable open database technologies: Postgres, MySQL, MongoDB or SQL Server on the backend and SQLite on the client-side. ‍ PowerSync itself is also open-source and source-available . Syncing apps provide an unmatched user experience: app interactions are instant, data updates fan out to all users in…from powersync.com

In the maker’s words, at launch

Hi HN, Today we’re launching PowerSync, a Postgres<>SQLite bi-directional sync engine that enables an offline-first app architecture. It currently supports Flutter, React Native and web (JavaScript) using Wasm SQLite in the browser, with more client SDKs on the way. Conrad and I (Ralf) have been working on our sync…

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  ElectricSQL, Postgres to SQLite active-active sync for local-first apps2023 · electric-sql.com · ▲617

  Hi HN, James, Valter, Sam and the team from ElectricSQL here. We're really excited to be sharing ElectricSQL with you today. It's an open source, local-first sync layer that can be used to build reactive, realtime, offline-capable apps directly on Postgres with two way active-active sync to SQLite (including with WASM in the browser). Electric comprises a sync layer (built with Elixir) placed in front of your Postgres database and a type safe client that allows you to bidirectionally sync data from your Postgres to local SQLite databases. This sync is CRDT-based, resilient to conflicting…

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  Postgres-SQLite sync engine source code released under FSL2024 · github.com · ▲16

  PowerSync Service is the server-side component of the PowerSync sync engine. - powersync-ja/powersync-service

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  Replicate App-Embedded DuckDBs into PostgreSQL with SyncLite OSS2024 · github.com · ▲73

  Hi HN, We have been building SyncLite, an open-source platform to simplify offline-first application development. If your application uses SQLite or DuckDB, SyncLite lets it continue using the local database as usual while synchronization happens in the background. For SQL-based applications, SyncLite records transactions into transactionally consistent .sqlog files using SQLite as an open replication format. A background consolidator replays those transactions, derives row-level CDC and schema changes, and applies them transactionally to destination databases like PostgreSQL. The same…

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  Offline-first SQL sync with Typescript and Rust cores - syncular/syncular

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  Local-first collaboration SDK for React, Vue, and Svelte. Batteries-included: Rich text, undo/redo, cursors, and presence. - Dancode-188/synckit

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