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Langfuse

Free tier

Open-source AI engineering platform to debug, monitor, and improve LLM applications and agents

Free tier available·Technical·API available·Open source
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Key strengths

Open-source (MIT) with full self-hosting supportEnd-to-end LLM observability with hierarchical tracingNative OpenTelemetry support with 80+ integrationsEnterprise-grade scale — 10B+ observations/month via ClickHouse backendUnified platform: tracing, prompt management, evals, and experiments in one place
Free tier + paid plans
Founded 2023
Self-hostable
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