The 7 Best LLM Observability and Tracing Tools in 2026: Langfuse, LangSmith, Arize, Helicone, Braintrust, Weave, and TrueFoundry Compared
Langfuse, LangSmith, Arize AI, Helicone, Braintrust, Weights & Biases Weave, and TrueFoundry, ranked honestly on tracing depth, evaluation integration, pricing transparency, and deployment flexibility — with real pros and cons for each.