LangSmith vs Vellum
Detailed side-by-side comparison to help you choose the right tool
LangSmith
đ´DeveloperBusiness Analytics
LangSmith lets you trace, analyze, and evaluate LLM applications and agents with deep observability into every model call, chain step, and tool invocation.
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Starting Price
FreeVellum
đ´DeveloperAI Developer Tools
LLM development platform for prompt engineering, evaluation, workflow orchestration, and deployment of production AI applications. Helps engineering teams build, test, and ship LLM-powered features with version control and observability.
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FreeFeature Comparison
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đĄ Our Take
Choose Vellum if you want an integrated prompt-to-deployment platform with visual workflow building and managed infrastructure. Choose LangSmith if your stack is built on LangChain and you need deep tracing and observability for LangChain-specific constructs. Vellum offers a broader development lifecycle; LangSmith offers tighter LangChain integration.
LangSmith - Pros & Cons
Pros
- âComprehensive observability with detailed trace visualization
- âNative MCP support for universal agent tool deployment
- âGenerous free tier for individual developers and small projects
- âNo-code Agent Builder reduces technical barriers
- âManaged deployment infrastructure with production-ready scaling
- âStrong integration with entire LangChain ecosystem
Cons
- âPrimarily designed for LangChain applications (limited framework support)
- âSteep pricing jump from Plus to Enterprise tier
- âPay-as-you-go model can become expensive for high-volume applications
- âEnterprise features require annual contracts
- â14-day retention on base traces may be insufficient for some use cases
Vellum - Pros & Cons
Pros
- âComplete LLM development lifecycle in one platform â from prompt engineering through production monitoring
- âAutomated evaluation pipelines catch prompt regressions before they reach users
- âVisual workflow builder enables complex AI pipelines without orchestration code
- âModel-agnostic approach supports OpenAI, Anthropic, Google, and other providers side by side
- âSOC 2 Type II certified with HIPAA compliance available for regulated industries
- âStrong API and SDK support (Python, TypeScript) for CI/CD integration
Cons
- âLearning curve for teams new to structured LLM development practices
- âPro tier at $89/seat/month is higher than some competitors, and Enterprise requires custom sales engagement
- âAdds a dependency layer between your application and LLM providers
- âWorkflow builder may be less flexible than code-first orchestration for very complex pipelines
- âEvaluation framework effectiveness depends on teams defining good test criteria
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