Tag LangWatch

Observability

8 Best Open Source LLM Observability Tools You Can Self-Host in 2026

Navy diagram of three self-host server racks sending amber traces into an open observability ring

Compare 8 open source LLM observability tools you can self-host in 2026, including Langfuse, Opik, Phoenix, Helicone, LangWatch, Agenta, Laminar, and OpenLIT, on license, OTel, Docker, and cost.

AgentStack Observability Desk
October 13, 2026

AgentStack is the operator’s manual for enterprise AI agents: sourced guides, comparisons and field notes for the AI, ops and product leaders who build, buy and run them.

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