MLflow | AgentStack

Evals & Testing

10 Best AI Agent Evaluation Tools in 2026, Open Source and Paid

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The 10 best AI agent evaluation tools for 2026, compared on trajectory and tool-call scoring, online evals, CI gates, self-hosting, and price, with a same-workload cost table and a tested CI example.

AgentStack Agent Engineering Desk
October 12, 2026

Observability

8 Best LangSmith Alternatives in 2026, Including Open Source

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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 MLflow

10 Best AI Agent Evaluation Tools in 2026, Open Source and Paid

8 Best LangSmith Alternatives in 2026, Including Open Source

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