Langfuse

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Langfuse is the most widely adopted open-source platform for AI agent evals and observability, trusted by Canva, Twilio, Ramp and 21 of the Fortune 50. Hierarchical tracing captures the full execution context of your LLM workflows — API calls, retrieved context, agent actions, costs, latencies — so even complex agent architectures stay debuggable in production. LLM-as-a-judge evals, human annotation, and dataset-driven experiments tie back to your traces and prompts, closing the loop from spotting an issue to measuring the fix. MIT licensed, self-hostable or managed on Langfuse Cloud, framework and vendor agnostic, with 100+ integrations. Get started at langfuse.com — generous free tier, no credit card required.