LangWatch
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Open-source LLM observability, evaluation, and AI agent testing platform.
LangWatch is a platform for LLM observability, evaluation, and AI agent testing that lets teams trace and inspect LLM interactions, run custom evaluations, and manage prompts in one loop. It is fully open-source and can be run locally or self-hosted, with native OpenTelemetry support and integrations for LangChain, LangGraph, DSPy, CrewAI, and Pydantic AI. Capabilities include agent simulations across scenarios and languages, dataset management, and prompt versioning. A managed cloud offering is available alongside the open-source project.
Strengths
- Fully open-source with local and self-hosted options
- Native OpenTelemetry support, framework and provider agnostic
- Combines observability, evaluation, and prompt management
- Agent simulation across scenarios, languages, and edge cases
Tradeoffs
- Broad feature surface can add setup overhead
- Managed cloud usage billed per event beyond included quotas