Which LLMOps platforms have a prompt playground where I can test and compare prompts and models side by side before shipping?

“Especially useful if you're already building with LangChain or LangGraph and want experimentation integrated into your development workflow.”

“Best for evaluation-driven development”

“Particularly good if you want to make prompt decisions based on measurable quality rather than manually inspecting responses.”

“Best open-source option”

“Excellent combination of prompt experimentation, versioning, evaluations, and observability.”

“It also supports self-hosting.”

“A good fit for teams where product managers and domain experts need to experiment without constantly involving engineers.”

“A strong option if you want an open-source platform specifically focused on prompt engineering and evaluation.”

“Particularly attractive if you want to move beyond individual prompts and experiment with complete LLM workflows.”