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Spindle

a full-featured, type-safe web framework for OCaml 5

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Spindle is a multicore-by-design, eio-native web framework for modern OCaml.Its central idea is to provide an expressive, type-driven API and derive the rest: codecs, request validation, OpenAPI spec and frontend schemas (Zod and Melange). This keeps contracts in sync between server and client without maintaining separate definitions.The framework includes an RFC-strict HTTP server, composable dependencies, WebSockets, SSE and high-level primitives for building MCP servers. It also provides production-ready essentials like distributed tracing, OT-compatible metrics, logging and other features you would expect. Speed was never the goal but the benchmarks show it running x2 faster than NestJS and x5 faster than FastAPI on a single core.Give it a try.Documentation: https://hyphatech.github.io/spindle/

HN · launched Nov 5, 2026 · 64 upvotes (top 17%) · 0 views

Niche: software development frameworks · 154 launches, 2 in the last 7 days ▼ -89% · Explore this niche →

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

Visit website ↗ Source listing ↗

More like this: all 154 launches in software development frameworks →

Could you build this?

Partial The HTTP layer and code generation can be built iteratively with AI help, but a type-driven framework with derived codecs, OpenAPI, and Zod/Melange output depends on deep OCaml, effects, and type-system expertise that vibe coding will struggle to get right.

What it would actually take: The stack is OCaml 5 with eio for concurrency, a ppx or type-level derivation layer for codecs and validation, and generators for OpenAPI, Zod, and Melange frontend schemas. The hard parts are designing a sound type-driven API that derives all artifacts without drift and keeping the multicore/eio runtime correct under load. Building it requires experienced OCaml systems engineers who understand ppx tooling, effect handlers, and the OpenAPI and Zod specs.

Discussion

8 comments analyzed.

Concerns raised: Website has an AI-generated look, No deployed real-world example to evaluate

Feature requests: Use Eio.Path.open_subtree in static file serving to prevent symlink escapes

Competitors

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

Attention rank: #49 of 264 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 372 days after the earliest competitor.

Related data

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