Kyushu
A self-hostable WASM sandbox for JavaScript workers
Details
- External ID
- 48432722
- Source
- HN
- Company
- —
- Product
- Kyushu
- Website domain
- kyushu.dev
- Launched
- June 7, 2026
- Cohort
- —
- Upvotes
- 89
- Upvotes percentile
- 0.9036885245901639
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Enrichment
- Theme
- systems tools and desktop utilities
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- self-hostable wasm sandbox for javascript workers
- Manually corrected
- False
Could you build this?
No Developing a secure, self-hostable WebAssembly sandbox for executing isolated JavaScript workers demands deep expertise in systems programming, compiler/runtime runtimes, and low-level virtualization.
What it would actually take: Built with Rust using Wasmtime or Wasmer embedded with a lightweight JS engine like QuickJS or SpiderMonkey compiled to WebAssembly. The hard part involves designing strict deterministic memory limits, CPU cycle metering, secure capability-based POSIX/WASI virtualization, and thread pooling under high concurrency without sandbox escapes.
Discussion
20 comments analyzed.
Competitors mentioned: Cloudflare Workers (V8 isolates), Firecracker virtual machines, Service Workers, StackBlitz, iframe sandboxing
Concerns raised: Startup latency compared to Cloudflare Workers, Performance overhead from QuickJS layer, Sandboxing not as strong as Firecracker, Early and experimental stage, Untrusted code execution risks in plugin systems
Feature requests: Live reload for kyu dev, Migration path from Cloudflare Workers, Hybrid backup support for Cloudflare failover
Competitors
Other products that read as similar to this one — 1338 launches clear the similarity bar, closest 8 shown.
Attention rank: #144 of 1339 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 219 days after the earliest competitor.
- Blast · hn · 2026-08-28 · 11 upvotes · similarity 0.65
- container · github · 2026-09-23 · 11 upvotes · similarity 0.64
- moejs · github · 2026-09-24 · 8 upvotes · similarity 0.64
- Endo Familiar, an O-cap based JavaScript agent sandbox · hn · 2026-04-23 · 13 upvotes · similarity 0.62
- mistatic · github · 2026-09-11 · 7 upvotes · similarity 0.61
- Self-host open-source LLMs on AWS with scale-to-zero · hn · 2026-09-09 · 7 upvotes · similarity 0.59
- Forge · hn · 2026-07-04 · 5 upvotes · similarity 0.58
- nsl · github · 2026-09-26 · 65 upvotes · similarity 0.58
Other launches for this product
- No other launches for this product.
Same idea, different domain
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