LangFuse
FreemiumOpen-source LLM engineering platform for tracing, evals, and analytics.
Tool Info
Overview
LangFuse provides observability for LLM applications including traces, scores, and prompt versioning.
Self-hostable or available as managed cloud.
Pricing
Pros
- Open source
- Full tracing pipeline
- Eval integration
Best For
When NOT to Use
- Self-hosting requires infra
- Learning curve
Community Insights
Real implementation experiences shared by AI practitioners.
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Related Tools
Alternatives
Tags
Related Guides
- AI Observability
Production observability for LLM systems — traces with prompt/completion/tool spans, cost and latency attribution, quality proxies, and PII-safe instrumentation.
- AI Evaluation
Hub guide to evaluating AI systems — four eval layers, golden sets, LLM-as-judge, CI gates, and why public benchmarks are not product readiness.
- Agent Evaluation
Evaluate AI agents on task success, trajectory quality, tool-call accuracy, groundedness, safety, latency, cost, and production traces.
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