Make every bug perfectly reproducible
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We are building a VM that helps you simulate realistic production conditions, model latencies, different interleaving, user requests, and find bugs.Every non-deterministic property is turned into a knob you or a coding agent can control. We have helped teams perfectly reproduce support incidents and found bugs in some of the world's most well tested software (including a database).
HN · launched Jun 20, 2026 · 13 upvotes (top 33%) · 0 views
Niche: automated software testing tools · 185 launches, 12 in the last 7 days · Explore this niche →
Category and tags
- Horizontal
- Dev tools
- Developer
- Not AI
- Commercial product
Visit website ↗ Source listing ↗
More like this: all 185 launches in automated software testing tools →
Could you build this?
No Building a deterministic hypervisor or virtual machine that captures, replays, and controls every source of non-determinism (thread interleavings, memory access, syscalls, clock interrupts) is deep systems engineering research on par with Antithesis or rr.
What it would actually take: This requires hypervisor-level virtualization or kernel-level tracing (e.g., modified QEMU/KVM, eBPF, or ptrace-based record-replay engines like rr). The core challenge is eliminating non-determinism across multi-core execution, memory fences, asynchronous I/O, and CPU timer interrupts while maintaining reasonable performance overhead. Developing this requires world-class systems software engineers, deep low-level OS kernel knowledge, and specialized formal verification expertise.
Discussion
2 comments analyzed.
Concerns raised: Documentation and homepage are rushed and unclear, Unclear how to get started - what's the actual setup process, Homepage doesn't clearly explain whether library integration or OpenTelemetry instrumentation is needed, Ambiguous about data sources - unclear if it reads logs or requires other inputs
Feature requests: Clearer quickstart guide with concrete setup instructions, Better homepage explaining prerequisites and integration methods
Competitors
Other products that read as similar to this one : 191 launches clear the similarity bar, closest 8 shown.
Attention rank: #88 of 192 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 231 days after the earliest competitor.
- FixBugs · hn · 2026-07-13 · 43 upvotes · similarity 0.56
- Breken · ph · 2026-11-12 · 2 upvotes · similarity 0.46
- heal.dev · ph · 2026-10-22 · 195 upvotes · similarity 0.45
- AxonFlow, governing LLM and agent workflows · hn · 2026-01-20 · 11 upvotes · similarity 0.44
- ToolStorm · ph · 2026-09-24 · 1 upvotes · similarity 0.44
- ClientCoded · ph · 2026-10-22 · 1 upvotes · similarity 0.43
- Agent Rehearsal · ph · 2026-09-26 · 1 upvotes · similarity 0.43
- Buggo · github · 2026-09-22 · 13 upvotes · similarity 0.41
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