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LangWatch

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"LangWatch is the open-source (Apache-2.0) platform for teams shipping AI agents to production. Agent simulations test multi-turn and voice agents before release: a user simulator drives realistic conversations while a judge agent scores every turn, running locally, in CI, or no-code. In production, the same evaluators score live traffic in real time, guardrails protect against PII leaks and prompt injection, and OpenTelemetry-native tracing makes multi-agent systems legible. An AI gateway governs every model, key, and tool across the organization. Self-hosted, hybrid, or cloud (EU/US/UK/APAC), ISO 27001 certified and GDPR compliant. Built in Amsterdam, trusted by enterprises in banking and payments including Deloitte, Backbase, and PagBank.

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