LangWatch key facts
Last updated- Legal entity
- Reasoning Engine B.V.
- Headquarters
- Netherlands (NL)
- Ownership
- Independent
- Deployment
- SaaS
- Open source
- No
- US Cloud Act exposure
- Low (no US parent)
- Replaces
- Humanloop, LangSmith (LangChain), Langfuse, Braintrust
About LangWatch
LangWatch, operated by Reasoning Engine B.V., is an LLM engineering platform specifically designed to move AI applications from prototype to reliable production. It provides deep observability, automated evaluations, and systematic testing for AI agents. The platform is built to handle the complexities of multi-turn conversations and context engineering, making it suitable for large enterprises in regulated sectors such as fintech and insurance. The service differentiates itself through its flexibility, offering framework-agnostic integrations and self-hosted options. This allows engineering teams to maintain control over their AI workflows while utilizing enterprise-grade monitoring. LangWatch also maintains an open-source footprint through its LangEvals library, which helps developers perform LLM testing within their existing development environments like notebooks or pytest.
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