Developer
Free
Free tier with 5,000 traces/mo
- Traces
- 5,000 traces included per month
- Seats
- 1 seat
- Prompt playground
- Included
LangSmith
● Identity checkedCode · Vendor site 2026-10-04
LangSmith is an enterprise LLM observability, evaluation, and monitoring platform built by LangChain.
- Category
- Code
- Free access
- Developer plan includes 5,000 free trace events per month with 1 user seat and full tracing access.
- API access
- Native Python and TypeScript SDKs, REST APIs, and seamless zero-configuration integration with LangChain and LlamaIndex via environment variables.
Is LangSmith right for you?
A good fit for
Developers and engineering teams building LLM-powered applications and agents who need debugging, prompt optimization, latency tracking, and quality evaluation.
Before you choose
Free tier limited to 1 user and 5k monthly traces; additional trace volume billed at $0.005 per trace on paid tiers.
Platform summary
LangSmith is a specialized DevOps and observability platform for generative AI, enabling developers to monitor LLM interactions, run evaluations on test datasets, and debug complex agent systems.
What it can do
Features & capabilities
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Observability | Provides detailed visual waterfall execution traces for multi-step agent chains, showing exact token counts, latency, and intermediate tool call payloads. | Facts sourced | 2026-10-04 |
Understand the total cost
LangSmith pricing & plans
Plus
$39.00 /mo
$39 per user / month plus trace usage
- Collaboration
- Team workspaces and role permissions
- Data retention
- Extended retention up to 400 days
- Included traces
- Usage-based billing beyond included allocation
Enterprise
Not listed
Custom contract with volume discounts
- Deployment
- Self-hosted / hybrid VPC deployment
- Security
- SSO, RBAC, and SOC 2 Type II compliance
Alternatives to LangSmith
View all ↗
Deno DeployPlans scale request quotas, egress, custom domains, and collaboration features for hobby projects through enterprise deployments.
Explore tool
Context.devContext.dev is a web data API for AI agents and LLMs to scrape pages into Markdown, crawl sites, map domains, run batches, research the web, monitor changes, and retrieve brand data through one REST platform with SDKs and MCP support.
Explore tool
BubbleBubble is a visual no-code platform for building web and mobile applications with databases, workflows, design tools, and AI-assisted development in a hosted workspace.
Explore toolThe practical questions
Frequently asked questions
What is LangSmith used for?
LangSmith is an enterprise LLM observability, evaluation, and monitoring platform built by LangChain.
Does LangSmith have a free plan?
Developer plan includes 5,000 free trace events per month with 1 user seat and full tracing access.. This record lists ongoing free access; check the plan limits before starting.
How much does LangSmith cost?
The listed monthly price is $39.00 USD at monthly billing. See the plan cards for entitlements, billing commitments and seat minimums.
Can I use LangSmith through an API?
Native Python and TypeScript SDKs, REST APIs, and seamless zero-configuration integration with LangChain and LlamaIndex via environment variables.. API access and subscription access may have different terms; consult the linked sources.
What should I check before choosing it?
Free tier limited to 1 user and 5k monthly traces; additional trace volume billed at $0.005 per trace on paid tiers.
Price history
No retained pricing changes yet. A current price alone does not establish a historical trend.
How this profile is supported
Identity and profile
Reviewed vendor source
Read original source ↗Facts apply to the named version and check date. Send a sourced correction if something changed.