Tool
Langfuse
Open-source LLM observability with prompt management
About
Step-by-step guide to ingesting your first trace using OpenAI, LangChain, or the SDKs.
Session-level tracing, evals, and cost visibility for chat support and assistant experiences.
Trace, evaluate, and improve AI agents with one open platform. Use production data to understand behavior, collaborate on fixes, and ship better quality at lower cost and latency.
Langfuse connects tracing, monitoring, datasets, experiments, and evaluation in one continuous loop. Use production signals to understand behavior, test improvements, and ship better agents with confidence.
Features
- All product features MIT licensed
- Scales to billions of monthly events
- Fork, modify, contribute
- REST APIs for everything
- S3 blob storage export
- 35,000+ GitHub stars
- Pricing
- Open Source
- Pricing detail
- OSS + cloud Hobby/Core plans
- Platforms
- Web / Self-host
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