These tools competes with
Weights & BiasesvsLangSmith
ML experiment tracking and LLM evaluation versus LLM tracing, evaluation, and dataset management
Compare interactively in Explore →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
Choose LangSmith when…
- •You're already in the LangChain ecosystem
- •You want end-to-end tracing for LangChain apps
- •Dataset management and evals are part of your workflow
Side-by-side comparison
Field
Weights & Biases
LangSmith
Category
Prompt & Eval
LLM Infrastructure
Type
Commercial
Commercial
Free Tier
✓ Yes
✓ Yes
Pricing Plans
Teams: $50/user/mo
Plus: $39/mo
GitHub Stars
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Health
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Weights & Biases
Industry-standard ML experiment tracking platform with LLM-specific tools for prompt evaluation, fine-tuning monitoring, and dataset versioning.
LangSmith
LangChain's observability platform. Trace every LLM call, run evals on datasets, and manage prompts in production.
Shared Connections1 tools both integrate with
Only Weights & Biases (1)
LangSmith
Only LangSmith (8)
LangGraphLangChainCursorPydanticAIBraintrustHeliconeWeights & BiasesAgentOps
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See how Weights & Biases and LangSmith fit into the bigger picture — 207 tools, 452 relationships, all mapped.