PromptLayer
Log every LLM request, version prompts, and run A/B tests. Provides a visual interface for prompt engineering teams to iterate collaboratively.
Humanloop
Humanloop is a platform for managing prompts, running experiments, and evaluating LLM outputs in production. It provides a prompt editor, version history, A/B testing across models, and human plus automated eval workflows — keeping your prompts in sync with your code.