LangSmith
LangSmith: A broad LLM observability platform with especially strong LangChain ecosystem fit. Ranked #6 of 26 in LLM Observability Tools by our editors (8.9/10); pricing: Free plan; best for langChain-centric teams needing an integrated platform.
At a glance
- Editor score8.9 / 10
- PricingFree plan
- Best forLangChain-centric teams needing an integrated platform
- Free planYes
- Paid from$39/seat/mo
- LLM tracingYes
- Founded2023 · San Francisco, California, United States
- Facts checked20 Sep 2026
Where it wins
- Tracing, evaluations, prompt management, datasets, and monitoring in one platform
- Agent and tool-call tracing alongside human feedback workflows
- Cloud, hybrid, and self-hosted deployment options
Where it doesn't
- Usage-based charges apply after included trace allowances
- Enterprise pricing is custom
- Named integrations are narrower than some alternatives
Our verdict on LangSmith
LangSmith is a commercial platform for developing, testing, monitoring, evaluating, and deploying LLM applications and agents. It is particularly suited to teams building with LangChain or LangGraph, while also supporting applications built with other frameworks. Its scope covers application tracing and trace inspection, online and offline evaluations, prompt versioning and testing, datasets, human feedback, production quality monitoring, and agent and tool-call tracing.
Pricing is structured around a free Developer plan, a Plus plan at $39 USD per seat per month billed monthly, and an Enterprise plan with custom pricing. Developer includes up to 5k base traces per month, then pay-as-you-go, one seat, and community support. Plus increases the allowance to 10k base traces per month, then pay-as-you-go, adds unlimited seats, and includes one free Serverless Small deployment. Enterprise adds self-hosted and hybrid deployment options, custom SSO, ABAC, and RBAC, plus a support SLA. Teams should account for usage-based charges beyond the included trace allowances.
The platform connects with LangChain, LangGraph, OpenAI, Anthropic, Google Gemini, AWS Bedrock, and OpenTelemetry, and is available through web, API, and self-hosted options. Prompt Hub, the Playground, LLM-as-a-judge and code evaluators, experiment comparison, and production monitoring give teams a connected workflow from development through operations. LangChain-centric teams that want tracing, evaluation, prompt management, and agent visibility together should find the product well aligned. Teams prioritizing a broader named integration ecosystem, or those seeking fixed usage costs beyond the included allowances, should compare alternatives. Enterprise buyers with hosting or access-control requirements have a path through the custom tier.
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LangSmith pricing
All 3 LangSmith plans and prices →
LangSmith fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $39/seat/mo |
| LLM tracing | Yes |
| LLM evaluations | Yes |
| Prompt management | Yes |
| Agent tracing | Yes |
| Retrieval tracing | Yes |
| Token cost tracking | Yes |
| Deployment options | Both |
| Deployment | Cloud, Self-hosted |
| Platforms | Web |
| Compliance & security | SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML |
| Support | Community, Email, Tickets, Docs · 24/7 |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 7 integrations: LangChain, LangGraph, OpenAI, Anthropic, Google Gemini, AWS Bedrock … |
| Pricing | Free plan (source) |
| Website | langchain.com |
| Facts checked | 20 Sep 2026 |
LangSmith integrations
LangSmith lists 7 integrations on its own site.
- LangChain
- LangGraph
- OpenAI
- Anthropic
- Google Gemini
- AWS Bedrock
- OpenTelemetry
Alternatives to LangSmith
- Arize AXBroad LLM observability with tracing, evaluations, prompts, agents, RAG, and cost tracking.9.4
- LangfuseA broad observability platform with open-source deployment and accessible paid tiers.9.3
- Arize PhoenixA free platform for tracing, evaluating, and improving LLM applications.9.2
See all LangSmith alternatives →
LangSmith vs the competition
- LangSmith vs Arize AX
- LangSmith vs Langfuse
- LangSmith vs Arize Phoenix
- LangSmith vs Opik
- LangSmith vs W&B Weave
- LangSmith vs LangWatch
Compare LangSmith with any tool side by side →
Also Ranked In
LangSmith is ranked in 13 of our directories; the 6 strongest besides LLM Observability Tools.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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