LangWatch

LangWatch is a developer-first platform designed to help teams build, evaluate, and deploy reliable AI agents and LLM applications at scale. It streamlines the entire AI development lifecycle through structured testing, simulation, and monitoring. Agent Simulations – Convert production traces into evaluations, run thousands of synthetic conversations across scenarios and edge cases, and simulate end-to-end agentic systems Comprehensive Evaluations – Create custom evals to measure quality specific to your product, with automatic execution of test suites and real-time hallucination detection Prompt & Model Management – Version, compare, and deploy prompt and model changes with full traceability and feature-flag-style controls LLM Observability – Search and inspect any LLM interaction across environments, debug failures, and investigate incidents with complete visibility Batch Testing & Experiments – Track the impact of every change across prompts and agent pipelines directly from the platform or your code Production Monitoring – Monitor essential metrics and catch issues before they reach users Join thousands of AI developers using LangWatch to ship complex AI reliably. The platform addresses the critical challenge of AI reliability—preventing model degradation, prompt regressions, and multi-step agent failures through automated evaluations and simulations rather than manual checks alone. Deployment Options: Cloud or self-hosted