kitio.aiAdded Oct 28, 2026
LangSmith
Freemium · $39/moTracing, evaluation and deployment platform for LLM agents
What is LangSmith?
LangSmith is LangChain's platform for tracing, debugging, evaluating and deploying LLM applications and agents. It works with or without LangChain and LangGraph, and teams use it to see each step an agent takes and test changes before release.
Traces show prompts, tool calls, latency and cost for every run, and datasets plus evaluators let you score outputs with code, LLM judges or human review. A prompt hub manages versions, and deployment hosts LangGraph agents.
A free Developer plan covers a single user with a monthly trace allowance. Plus adds team seats and higher limits, and Enterprise offers self-hosting and hybrid deployment.
Features
- Agent tracing
- Datasets and evaluators
- Prompt hub
- Agent deployment
- Online monitoring
Tags
Releases
+ Submit new release- Listed
LangSmith was added to the directory.
Organization
LangChain
🇺🇸 United States
Listed by kitio.ai · unverified owner
Pricing
- Pricing model
- Freemium
- Paid options from
- $39/mo
- Billing frequency
- Monthly
LangSmith plans
Developer
Free
- 1 seat
- 5k base traces / month, then pay as you go
- Community support
Plus
$39/mo
- Per seat
- 10k base traces / month, then pay as you go
- Access to Deployment and Engine
- Unlimited seats
Enterprise
Custom
- Self-hosted and hybrid deployment
- Custom SSO, ABAC and RBAC
- Support SLA
Prices in USD, checked Oct 28, 2026. Plans change often, so confirm on the LangSmith site.Official pricing
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Pros and cons
Pros
- Detailed agent traces
- Strong LangGraph integration
- Works with any framework
Cons
- Per-seat pricing adds up
- Trace retention costs extra
- Self-hosting is enterprise-only
Prompts & results
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Reviews
Q&A
What is LangSmith?
LangSmith is LangChain's platform for tracing, debugging, evaluating and deploying LLM applications and agents. It works with or without LangChain and LangGraph, and teams use it to see each step an agent takes and test changes before release.
How much does LangSmith cost?
LangSmith is freemium, with paid plans from $39/mo.
Is there a free version of LangSmith?
Yes. LangSmith has a free plan, and paid plans add more usage and features.
What are the main features of LangSmith?
Agent tracing, Datasets and evaluators, Prompt hub, Agent deployment, Online monitoring.
Who makes LangSmith?
LangSmith is made by LangChain.
What are the best alternatives to LangSmith?
Popular alternatives include Arthur, AgentOps, Weights & Biases.