# PowerSync > PowerSync is a sync engine that keeps backend databases (Postgres, MongoDB, MySQL, MS SQL Server) in sync with embedded SQLite in mobile, desktop, and web clients. ## Benefits & Features - Offline-first by default: apps keep working with local SQLite data when connectivity is poor or unavailable. - Real-time sync: clients receive backend updates continuously for responsive, multi-user experiences. - Partial and authorized data sync: only relevant data is synced to each client. - Bidirectional flow: client-side writes are queued locally and synced back to backend systems. - Backend flexibility: works with existing Postgres, MongoDB, MySQL, and SQL Server databases. - Client SDKs across platforms: build local-first experiences for mobile, desktop, and web using familiar tools. ## Product - Website: https://powersync.com/ - Documentation: https://docs.powersync.com/ - Cloud signup: https://accounts.powersync.com/portal/powersync-signup - Dashboard: https://dashboard.powersync.com/ - Open source: https://powersync.com/open-source - Pricing: [PowerSync pricing (Markdown)](https://powersync.com/pricing.md) - GitHub: https://github.com/powersync-ja/ ## Learn - Blog: https://powersync.com/blog - Contact: https://powersync.com/contact ## Markdown for agents Append `.md` to a blog post, legal page, or the pricing page URL to get its markdown source. For example https://powersync.com/blog/.md and https://powersync.com/legal/.md. Pages that offer a markdown twin also advertise it with a `` tag. - All posts and legal pages in one file: https://powersync.com/llms-full.txt - Blog index (HTML): https://powersync.com/blog - Blog feed (RSS, all posts): https://powersync.com/blog/rss.xml ## Licensing & Terms - Licensing & Terms Overview: https://powersync.com/legal/licensing-terms - Privacy Policy: https://powersync.com/legal/privacy-policy