Best Usage & Audit Logging Software

Helicone is an open-source LLM observability platform for developers to log, monitor, debug, and optimize generative AI applications with features like caching, retries, and an AI Gateway.

Portkey is an enterprise AI gateway providing unified access to 1600+ LLMs, observability, governance, guardrails, and MCP support for production AI apps.

LangSmith is a unified platform for developing, debugging, testing, evaluating, and monitoring LLM applications with tracing, observability, and deployment tools.