LangSmith
Evaluation & observability · Freemium
About
LangChain's platform for tracing, evaluating and monitoring LLM apps, with a prompt hub and playground.
Key features
- Detailed run traces
- Datasets and evaluators
- Prompt hub and playground
- Production monitoring
Best for
- — LangChain and LangGraph users
- — Dataset-based evaluation
- Pricing
- Freemium
- Platforms
- Web, API
- Works with
- LangChain, OpenAI
- Last checked
- 2026-10-29
- Status
- Listed, not yet tested
Our take
Deep tooling, especially inside the LangChain ecosystem. Less compelling if you don't use LangChain.
Features and pricing change often — confirm on langchain.com before you commit.
Alternatives to LangSmith
| Tool | Type | Pricing | Best for |
|---|---|---|---|
| LangSmith (this) | Evaluation & observability | Freemium | LangChain and LangGraph users |
| Langfuse | Evaluation & observability | Open source | Tracing LLM apps in production |
| Braintrust | Evaluation & observability | Freemium | Systematic evals before shipping |
| Arize Phoenix | Evaluation & observability | Open source | Local debugging of LLM traces |
| W&B Weave | Evaluation & observability | Freemium | Teams already on Weights & Biases |
| Helicone | Evaluation & observability | Freemium | Quick cost and usage visibility |
| promptfoo | Evaluation & observability | Open source | Prompt regression tests in CI |