AI observability platform for monitoring LLM applications, tracing requests, tracking costs, and improving AI reliability.
Cost / License
- Paid
- Proprietary
Since
- Since 2026
AI observability platform for monitoring LLM applications, tracing requests, tracking costs, and improving AI reliability.
Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more.




Helicone is the open-source LLM observability platform for developers to monitor, debug, and improve production-ready applications.


Opik is an open-source platform for evaluating, testing and monitoring LLM applications. Built by Comet.

The agentic analyst for your agents. Your observability tool only tells you what happened. TwoTail figures out why, and what you should change.

Proxy that logs every LLM prompt, response and tool call to an encrypted audit trail, and blocks or flags requests carrying PII, secrets or policy violations before they reach the provider.
