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Firenook

Firebase emulators in Rust: 40× faster writes, 10× less RAM

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Hi HN, we have been developing with Firebase for a long time, and the only way Firebase developers can build apps without directly costing them is using the official Firebase Emulator Suite.However, the issue with this suite is, it's dependent and running on Java with a old Console UI (not updated in years), that was not built to support tons and millions of data and has pretty bad developer experience. For a long time, we were hitting Out of Memory on even high specs laptop while developing and the worst part is while this happens all the persists data keep getting lost.We were honestly frustrated with this, and thought what if we built the Firebase Emulator Suite the right way, as it always should have been.Introducing Firenook, a faster drop-in replacement for Firebase Emulator Suite for Firebase developers. It's 40x faster writes and needs 10x less RAM to run it. We took the right approach of first building it Rust as a single engine, so that there will be no Java dependencies and built from scratch a new Console UI using modern web stacks.The result is, now we were able to run 2 millions datas loaded to Firenook with only taking around 2GB ram compared to 22GB of the official suite. Things are way faster and rebuilt Console UI gives best developer experience from logging Firebase Functions, to editing Firestore documents in JSON and many more.We developed this throughly for around 2 months now and ran this internally for a month before we decided it's time to release it to public so that other devs can make use of Firenook and also contribute it to make it better.Firenook is still new and I'm sure it misses things. So please try it our on your project and let us if there are any issues.Thank you.

HN · launched Nov 5, 2026 · 172 upvotes (top 7%) · 0 views

Niche: software and system emulators · 114 launches, 3 in the last 7 days ▼ -70% · Explore this niche →

Category and tags

  • Horizontal
  • Dev tools
  • Developer
  • Not AI
  • Hobby / open-source project

Visit website ↗ Source listing ↗

Could you build this?

Partial The UI, CLI, and packaging are vibe-codeable, but a real drop-in replacement must faithfully emulate Firestore, Realtime Database, Auth, and security rules behavior. Matching the SDKs' wire protocols and edge-case semantics is the hard part.

What it would actually take: The stack would be a Rust or Node server that speaks the same gRPC and WebSocket protocols the Firebase SDKs use, plus a security-rules evaluator and a persistent storage layer. The hard parts are protocol-level compatibility and matching Firestore's query and consistency semantics, verified against the official SDK test suites. This needs someone who knows Firebase internals and distributed-database semantics, not just app-building.

Discussion

3 comments analyzed.

Competitors mentioned: Firebase Emulator Suite

Feature requests: replace cloud production services

Competitors

Other products that read as similar to this one : 263 launches clear the similarity bar, closest 8 shown.

Attention rank: #32 of 264 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 369 days after the earliest competitor.

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