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Show HN: Firenook – Firebase emulators in Rust: 40× faster writes, 10× less RAM

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 an

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Source record

Recorded metrics

points · 52 votes
2026-11-06 03:30:15.057Z
cumulative since publication

Research analysis

What changed

Source account: 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 an

Version & cost evidence

Source votes: 52 votes (Nov 6, 2026 UTC; cumulative since publication) Recent records to compare: “Show HN: I made a game where you have to think of answers others wouldn't give” (Show HN, Nov 6, 2026); “Show HN: HackerGit – Every GitHub repo shared on HN” (Show HN, Nov 5, 2026). Shared themes are navigation hints; they have not been verified as the same need or independent corroboration.

Who is affected

Identify the existing workflow this change affects before recommending an upgrade. Launch attention does not establish improvement; an API, pricing or availability change may instead create migration work.

Missing comparison points

Missing checks: old versus new behavior, affected plans and regions, availability date, compatibility, rollback path and cost under the same workload.

Migration check

Save the release or policy notice, run the same task on the old and new option, and compare outputs and the full bill. For retirement notices, verify the deadline before scheduling migration.