
Your LLM tests, without the provider
LLM Test Server is a local, deterministic stand-in for 13 LLM provider APIs. Your app keeps its official SDK and points it at namespaced routes like /openai/v1; answers, tool calls, streams and failures come from fixtures your test sets up. The dashboard shows where every token goes: system prompt, tool schemas, conversation turns, prompt-cache reads and writes. Built forNET and Aspire, and shipped as a Docker image so any stack can use it. Free and open source.
LLM Test Server is an open-source tool that simulates 13 LLM provider APIs locally, allowing developers to test their applications without relying on external services. It provides a dashboard for tracking token usage and is compatible with any stack via a Docker image.
A source that found nothing is a measurement. A source that has not run is a gap. Neither means the launch lacks the thing.