Laminar | AgentStack

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

Observability

8 Best LangSmith Alternatives in 2026, Including Open Source

Abstract amber trace path branching away from a fading grey trace path on a dark navy background

The 8 best LangSmith alternatives for 2026, compared on self-hosting, licence, tracing, evals, and price, with a same-workload cost table and a step-by-step plan to migrate off LangSmith.

AgentStack Observability Desk
October 11, 2026

Tag Laminar

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

8 Best LangSmith Alternatives in 2026, Including Open Source

TOPICS

COMPANY

LEGAL