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Hiraeth

AWS Emulator

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With the recent changes around Localstack pricing/licensing I've been hunting for alternatives. I decided that it might be a fun experiment to try rolling my own. SQS is a service I use heavily so I chose that as the first service to implement. I have more services planned and in development.A few things I think are cool:4MB Docker Image SizeInstant StartupAWS Sigv4 AuthenticationA little admin UI that can be helpful for development/troubleshootingMost of the SQS API implemented, the rest will soon follow :)

HN · launched Apr 16, 2026 · 40 upvotes (top 18%) · 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 ↗

More like this: all 114 launches in software and system emulators →

Could you build this?

Partial Emulating a subset of a single service like SQS is straightforward, but building a usable AWS emulator requires accurately reproducing complex distributed system semantics, XML/JSON protocols, and edge-case compatibility across multiple AWS APIs.

What it would actually take: A working system requires an HTTP server implementing AWS Signature v4 auth and the exact wire protocols (XML/JSON/query protocols) of AWS services. The backend needs in-memory or embedded database state engines mimicking message visibility timeouts, deduplication windows, FIFO ordering, and DLQ semantics. While AI can write standard CRUD mock handlers, ensuring behavioral fidelity against official AWS SDKs and integration suites requires tedious manual protocol reverse engineering and deep distributed systems debugging.

Discussion

13 comments analyzed.

Competitors mentioned: LocalStack, SmoothMQ

Concerns raised: Request validation gaps still need work, Response formats and codes are best effort, Why not test on real AWS with smaller instances instead

Feature requests: ECS/Fargate emulator that runs actual Docker containers locally, Simulated billing/cost explorer

Competitors

Other products that read as similar to this one : 119 launches clear the similarity bar, closest 8 shown.

Attention rank: #26 of 120 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 168 days after the earliest competitor.

Related data

The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.