Editorial note: Product capabilities, licenses, cloud credits, hosting costs, and plan limits change frequently. Verify current details directly before making a purchasing or architecture decision.
Overview
LangSmith helps teams observe, evaluate, debug, test, monitor, and deploy AI agents and language-model applications. It can be used with LangChain or other frameworks.
Best for
AI engineering teams that need tracing, evaluations, monitoring, debugging, and production oversight for agents and LLM applications
Key features
- Distributed tracing
- Agent observability
- Evaluation datasets
- Prompt and application testing
- Production monitoring
- Deployment support
Pricing
LangSmith provides a free tier and paid plans that scale with seats, traces, retention, evaluation usage, and enterprise requirements. Verify current allowances directly.
Check current official pricing
Pros
- Framework agnostic
- Strong debugging workflow
- Useful evaluation tooling
- Works closely with LangChain
Cons and cautions
- Trace costs can grow
- Requires instrumentation
- Enterprise needs may require custom plans
- Does not replace application monitoring entirely
Frequently asked questions
Is LangSmith free?
LangSmith offers a free tier for development and smaller workloads, with paid plans for higher usage.
Does LangSmith only work with LangChain?
No. LangSmith is designed to be framework agnostic.
What does LangSmith monitor?
It can trace, evaluate, and monitor model and agent behavior across development and production.
Before you choose
- Verify licensing and hosted-service terms
- Estimate model, storage, execution, and infrastructure costs
- Test the tool on a representative workload
- Plan monitoring, security, backups, and failure handling
- Compare at least one relevant alternative
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