Looking for an open-source alternative to Firebase Realtime Database? Below are 2 community-built tools that offer similar functionality — all free, open source, and ready to use or self-host. Ranked by GitHub stars.
SpacetimeDB is a high-performance multiplayer database designed for real-time game and application development, enabling low-latency synchronization and seamless state sharing between clients.
Liveblocks provides customizable, real-time collaborative features—presence, comments, storage, and AI-powered workflows—to turn your app into a multiplayer experience. Designed for modern apps needing real-time collaboration and seamless user interaction, Liveblocks enables developers to easily integrate collaborative and AI-ready features without overhauling their product roadmap.
The top picks from this list are SpacetimeDB, Liveblocks — all maintained, free to use, and self-hostable.
Yes. Every tool listed here is open source and free to use. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Most of the alternatives listed are self-hostable. Check each tool's page for hosting details, system requirements, and licensing terms.
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