These tools competes with
LangfusevsWeights & Biases
OSS LLM engineering platform (acquired by ClickHouse, Jan 2026) versus ML experiment tracking and LLM evaluation
Compare interactively in Explore →Choose Langfuse when…
- •You want open-source LLM observability
- •Self-hosting your tracing stack is important
- •You need cost tracking across models and users
Choose Weights & Biases when…
- •You're running ML experiments alongside LLM work
- •Model training tracking and artifact management are needed
- •You're a data scientist who uses Weights & Biases already
Side-by-side comparison
Field
Langfuse
Weights & Biases
Category
Observability
Observability
Type
Open Source
Commercial
Free Tier
✓ Yes
✓ Yes
Pricing Plans
Cloud: $59/mo
Teams: $50/user/mo
GitHub Stars
⭐ 7,000
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Health
●95 — Active
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Langfuse
Open-source platform for tracing, evaluations, and prompt management. Self-hostable alternative to LangSmith with broad framework support. Acquired by ClickHouse in January 2026; OSS core continues with deeper ClickHouse-backed analytics.
Weights & Biases
Industry-standard ML experiment tracking platform with LLM-specific tools for prompt evaluation, fine-tuning monitoring, and dataset versioning.
Shared Connections1 tools both integrate with
Only Langfuse (30)
Claude CodeCrewAICursorLangGraphLangChainOpenHandsAutoGenLlamaIndexDifyMastra
Only Weights & Biases (1)
Langfuse
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See how Langfuse and Weights & Biases fit into the bigger picture — 235 tools, 543 relationships, all mapped.