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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 engine since 2009, originally as part of a full-stack app platform. That version of the system is still used in production worldwide and we’ve learnt a lot from its use cases and scaling. About a year ago we started on spinning off PowerSync as a standalone product that is designed to be stack-agnostic.

If you’d like to see a simple demo, check out the pebbles widget on the landing page here: https://www.powersync.com/

We wrote about our architecture and design philosophy here: https://www.powersync.com/blog/introducing-powersync-v1-0-po...

This covers amongst other things how we designed the system for scalable dynamic partial replication, why we use a server authority architecture based on an event log instead of CRDTs for merging changes, and the approach to consistency.

Our docs can be found here: https://docs.powersync.com/

We would love to hear your feedback! - Ralf, Conrad, Kobie, Phillip and team