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LangWatch

Testing and evaluation platform for AI agents, using simulations, evals, observability and governance to make agents reliable in production.

PricingFreemium
Free planYes
UrduLimited / no

Best for: Teams shipping AI agents to production

Visit LangWatch

LangWatch helps teams test AI agents properly before and after they go live. Instead of checking agents by hand, you can run simulations of realistic conversations, set up evaluations and experiments, and inspect traces to find where things break.

It also offers observability and governance features for agents already in production. Teams can self-host it quickly or book a demo, and there is a free option for getting started.

Key features

  • Simulation-based agent testing
  • Evals and experiments
  • Tracing and observability
  • Self-hosting option

Prices and features change often; check the official website for the latest plans. Last updated September 24, 2026.

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