Show HN: PrismCat – Local transparent proxy and debugging console for LLM APIs

Category: devtools

Tags: llm-proxy, debugging-tool, observability

Score: 7.8/10 (Innovation: 7, Technical: 8, Documentation: 9, Utility: 7)

PrismCat is a self-hosted transparent proxy and debugging console for LLM APIs that lets you inspect, replay, and modify requests and responses without modifying your application code. It uses subdomain routing for zero-friction integration, captures streaming data, and provides a full dashboard for observability and debugging. Its innovative combination of local-first privacy, LLM-specific features like Base64 folding and SSE merging, and replay capabilities fills a clear gap for developers debugging LLM integrations.

Target audience: backend devs

Repository: https://github.com/paopaoandlingyia/PrismCat · TypeScript · MIT · 64 stars

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