PromptLayer

PromptLayer is a prompt management and observability platform for teams building on large language models. It centralizes how organizations design, version, test, and deploy prompts across multiple LLM providers, so prompts become trackable assets instead of scattered snippets in code. Developers can log every request and response, capture metadata such as model, parameters, and user context, and replay or compare prompts over time.

The platform supports A/B testing of prompt variants, structured evaluations using human or AI-based judges, and custom scoring metrics to identify the best-performing configurations before rollout. PromptLayer also provides production-grade observability, including request traces, latency monitoring, error tracking, and cost analytics by model, project, or environment.