LangWatch
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Introduction
AI agent testing and evaluation platform with simulations, evals, observability, and governance.
Listed on
July 23, 2026
What is LangWatch?
LangWatch is an LLM engineering platform for teams that ship AI to production. It provides agent simulation testing, LLM evaluation, observability, AI governance, and prompt management. The platform helps turn unpredictable agents into reliable production systems.
How to use LangWatch?
- Start free in 5 minutes, no credit card required. Instrument your LLM calls with SDKs (Python, TypeScript, Go) or OpenTelemetry. Create scenarios to simulate user interactions, run evaluations, and monitor traces. Deploy in cloud, self-hosted, or hybrid environments.
Core features of LangWatch
- Agent simulation testing with realistic user scenarios
- LLM evaluation with LLM-as-a-judge and custom evals
- LLM observability with full trace history and cost tracking
- AI governance with virtual keys, budgets, and audit trails
- Prompt management with versioning and GitHub sync
- Voice AI testing and red-teaming
- OpenTelemetry native support
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