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LangSmith vs Phoenix
Side-by-side comparison of features, pricing, and ratings
Pricing
Freemium
Freemium
Plans
$0/seat/month
$39/seat/month
Custom pricing
$0/mo (open-source)
$0/mo (managed cloud)
Custom
Popularity
6.4k views
7.0k views
Skill Level
Intermediate
Intermediate
API Available
Platforms
WebAPI
WebAPICLI
Categories
💻 Code & Development📊 Data & Analytics🤖 Automation & Agents
💻 Code & Development📊 Data & Analytics
Features
Agent tracing with step-by-step execution visibility
Real-time monitoring dashboards with latency and cost tracking
Online LLM-as-judge and code evaluations
Automated topic clustering and error analysis insights
Purpose-built SmithDB for sub-second trace queries
Self-hosted deployment for data residency compliance
Mult-turn conversation threading for chat interactions
Alerts via webhook and PagerDuty
Cost breakdowns by model and tool invocation
Trace filtering by JSON key-path, full-text search
Support for Python, TypeScript, Go, Java SDKs
OpenTelemetry integration for existing pipelines
Agent tracing: prompts, retrievals, tool calls, outputs
LLM-as-judge evaluations for scoring outputs
Annotation workflows with human review
Dataset creation from traces
Experiment runner for hypothesis testing
Prompt IDE for iterative prompt optimization
Evaluation on cost, latency, and performance
Self-hosting on Docker or Kubernetes
Cloud instances with no infrastructure setup
Vendor-agnostic: support for any model or framework
OpenTelemetry native support
Integrations
OpenAI SDK
Anthropic SDK
Vercel AI SDK
LlamaIndex
LangChain
LangGraph
OpenTelemetry
PagerDuty
NVIDIA NeMo Agent Toolkit
Docker
Kubernetes