L
LangSmith
44
Stack Score
Editorial pick✓ Verified working
LangSmith
Observability + evals for LLM apps.
Try LangSmith✓ Free trial available
Best for
Best for AI engineering teams building production LLM apps.
At a glance
- Pricing
- freemium
- Setup time
- 20 minutes
- Learning curve
- moderate
- Last verified
- 5/26/2026
What we love
- ✓Best LLM-app observability
- ✓Tight LangChain integration
- ✓Generous free tier
Where it falls short
- −Per-trace pricing climbs
- −Best inside LangChain ecosystem
- −Self-host requires Plus+
Pricing
✓ Pricing verified Jun 21, 20263 tiers
Developer
$0
per month
- ✓5K traces
Plus
$39
per user/month
- ✓More traces
- ✓Datasets
Enterprise
Custom
annual
- ✓Self-host
Overview
LangSmith is LangChain's production LLM observability platform — traces, evals, prompt tracking, datasets. Works with any LLM stack, not just LangChain.
Key features
- ●LLM call tracing
- ●Eval datasets
- ●Prompt versioning
- ●Production monitoring
- ●Works with any LLM stack
Best use cases
LLM app debugging
Trace + debug complex LLM pipelines including agents and RAG.
Production eval pipeline
Run regression evals on every deploy to catch model regressions.
Integrations
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