Langfuse

Open Source Agent Evals & Observability

Open-source AI engineering platform for tracing, evaluating, and improving AI agents and LLM applications. Provides observability (hierarchical traces, sessions, cost and latency tracking), prompt management with versioning and deployment, evaluation (LLM-as-a-judge, custom evaluators, human annotation), experiments on datasets, dashboards and alerts. MIT-licensed core with self-hosting options (Docker Compose, Kubernetes, Terraform) and a hosted cloud offering. Works via OpenTelemetry with native Python/JS SDKs and 100+ integrations.

Category: Monitoring & observability
Pricing: freemium
Free tier: yes
API: yes
MCP server: yes
SDK: yes
Open source: yes

#ai #llm #observability #tracing #evals #prompt-management #open-source #opentelemetry

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Listed 2026-10-22 · last verified 2026-10-22 · extracted by @cf/zai-org/glm-5.3-flash · confidence 0.95

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API

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