LangSmith is LangChain's proprietary observability platform. OpenLIT is framework-agnostic, fully open-source (Apache 2.0), and works with any LLM provider or orchestration framework.
| Feature | OpenLIT | LangSmith |
|---|---|---|
| Core Architecture | ||
| OpenTelemetry-native | ||
| Open Source | Apache 2.0 | |
| Self-hostable | Enterprise plan only | |
| Framework-agnostic | Best with LangChain; supports others via SDK | |
| Free self-hosted tier | ||
| LLM Monitoring | ||
| Token usage tracking | ||
| Cost per request | ||
| Latency / p95 metrics | ||
| Prompt & response logging | ||
| 60+ integrations (LLMs, frameworks, VectorDBs, GPUs) | Primarily via LangChain wrappers | |
| Infrastructure Monitoring | ||
| GPU monitoring (NVIDIA + AMD) | ||
| Vector DB tracing | ||
| Multi-environment tagging | ||
| Organisation management | ||
| Developer Tools | ||
| Prompt Hub (versioning) | ||
| Evaluations | ||
| Secrets Vault | ||
| Fleet Hub (multi-deployment) | ||
| Custom model pricing | ||
| Prompt playground | ||
| Dataset management for evals | ||
| Pricing | ||
| Free tier | Unlimited traces (self-hosted) | 5,000 traces/month |
| No credit card to start | ||
| Self-hosted free tier | ||
| Data ownership | Full (self-hosted) | LangChain cloud |
OpenLIT