Not specifically. Ultimately, ComfyUI would build prompts/API calls, which I tend to do in Python scripts.

I tend to use Mikupad or Open Web UI for more general testing.

There are some neat tools with ‘lower level’ integration into LLM engines, like SGlang (which leverages caching and constrained decoding) to do things one can’t do over standard APIs: docs.sglang.ai/frontend/frontend.html