LangSmith vs Helicone
Detailed side-by-side comparison to help you choose the right tool
LangSmith
🔴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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FreeHelicone
🔴DeveloperBusiness Analytics
Open-source LLM observability platform and API gateway that provides cost analytics, request logging, caching, and rate limiting through a simple proxy-based integration requiring only a base URL change.
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FreeFeature Comparison
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LangSmith - Pros & Cons
Pros
- ✓Comprehensive observability with detailed trace visualization
- ✓Native MCP support for universal agent tool deployment
- ✓Generous free tier for individual developers and small projects
- ✓No-code Agent Builder reduces technical barriers
- ✓Managed deployment infrastructure with production-ready scaling
- ✓Strong integration with entire LangChain ecosystem
Cons
- ✗Primarily designed for LangChain applications (limited framework support)
- ✗Steep pricing jump from Plus to Enterprise tier
- ✗Pay-as-you-go model can become expensive for high-volume applications
- ✗Enterprise features require annual contracts
- ✗14-day retention on base traces may be insufficient for some use cases
Helicone - Pros & Cons
Pros
- ✓Proxy-based integration requires only a base URL change — genuinely zero-code setup for OpenAI and Anthropic users
- ✓Real-time cost analytics with per-user, per-feature, and per-model breakdowns are best-in-class for LLM spend management
- ✓Gateway-level request caching can reduce API costs 20-50% for applications with repetitive queries
- ✓Open-source with self-hosted option gives full data control for security-conscious teams
- ✓Built-in rate limiting and retry logic at the proxy layer eliminates operational code from your application
Cons
- ✗Proxy architecture adds 20-50ms latency per request, which compounds in latency-sensitive agent loops
- ✗Individual request-level visibility doesn't capture multi-step agent workflows or retrieval pipeline context natively
- ✗Session and trace grouping features are less mature than Langfuse or LangSmith's dedicated tracing capabilities
- ✗Free tier limited to 10,000 requests/month — production applications will quickly need the $20/seat/month Pro plan
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