LangSmithObservability and evals for LLM agentsLangSmith Developer plan: free for one seat with 5,000 traces a monthLangSmith's Developer plan is $0 for one seat and includes up to 5,000 base traces a month for tracing and evaluating LLM apps.Free planOfficialFreeUnverifiedView dealfor LangSmith (opens provider site in a new tab)