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Helicone vs LangSmith
Side-by-side comparison of features, pricing, and ratings
Pricing
Freemium
Freemium
Plans
$0/mo
$79/mo
$799/mo
Custom
$0/seat/month
$39/seat/month
Custom
Popularity
2.6k views
6.4k views
Skill Level
Intermediate
Intermediate
API Available
Platforms
WebAPI
WebAPI
Categories
⚙️ Developer Infrastructure
⚙️ Developer Infrastructure
Features
AI Gateway routing to 100+ models
Per-request LLM observability logging
Rate limiting and cost alerts
Playground for testing prompts with reasoning effort control
Visual thinking display for thinking models
Datasets for versioning prompt data
HQL (Helicone Query Language) for log analytics
Sessions and users tracking
Passthrough billing with 0% markup
Caching, rate limits, automatic fallbacks
MCP (Model Context Protocol) compatibility
1M context window support (Claude Sonnet 4/4.5)
Prompt Management V2 with version control
Embedded observability via OpenAI API
Country-based request filtering
Trace agent executions step by step
Monitor real-time dashboards with cost tracking
Online LLM-as-judge evals for quality scoring
Automated insights with unsupervised topic clustering
SmithDB purpose-built for agent traces
Sub-second query performance across millions of traces
Full-text search with inverted index
JSON key-path filtering and trajectory queries
Self-host SmithDB inside your VPC
LangSmith Engine for autonomous issue detection and fixes
Deploy and scale agents with LangSmith Deployment
Sandboxes for safe agent-generated code execution
Fleet agents for no-code agent creation
Supports Python, TypeScript, Go, Java SDKs
OpenTelemetry support
Integrations
OpenAI
Anthropic
Azure
LiteLLM
Anyscale
Together AI
OpenRouter
n8n
OpenAI SDK
Anthropic SDK
Vercel AI SDK
LlamaIndex
LangChain
LangGraph
Deep Agents
PagerDuty
OpenTelemetry