LangSmith
Platform client for monitoring, evaluating and debugging LLM applications.
Prompts, structured output and evals PyPI MIT
Used in agent projects
23
0.2% of 12,697 public repos built with AI coding agents
Rank in prompts, structured output and evals
#4 of 4
by use in those projects
Downloads
19.3M
PyPI, last 7 days, langsmith
GitHub stars
1,072
last push Oct 9, 2026
How LangSmith is used
LangSmith is a dependency in 23 of the 12,697 public GitHub projects set up for AI coding agents that we scanned (0.2%), #4 of 4 in prompts, structured output and evals. The most used alternative there is Ultracite. Projects that use it most often also use LangChain (Python) (87.0%), Pydantic (87.0%), LangGraph (78.3%).
Often used with LangSmith
| LangChain (Python) | 87.0% of LangSmith projects · 78.3× more than average |
|---|---|
| Pydantic | 87.0% of LangSmith projects · 17.0× more than average |
| LangGraph | 78.3% of LangSmith projects · 121.2× more than average |
| python-dotenv | 78.3% of LangSmith projects · 12.0× more than average |
| OpenAI Python Library | 73.9% of LangSmith projects · 38.5× more than average |
| AnyIO | 69.6% of LangSmith projects · 47.5× more than average |
| FastAPI | 69.6% of LangSmith projects · 16.4× more than average |
| Pydantic Settings | 69.6% of LangSmith projects · 35.2× more than average |
By coding agent
| Claude Code | 0.3% of projects set up for it |
|---|---|
| GitHub Copilot | 0.3% of projects set up for it |
| Cursor | 0.3% of projects set up for it |
Share of public repos configured for each agent that list LangSmith as a dependency.
Install
| Package | pip install langsmith |
|---|---|
| Main stacks | Python (21), Next.js (2) |
| Example projects | ManojINaik/manimAnimationAgent |
Alternatives to LangSmith
| Tool | Used in agent projects | Downloads / wk | GitHub stars | License |
|---|---|---|---|---|
| Ultracite npm AI-ready code formatter that helps write and generate code faster. |
69 (0.5%) | 1.2M | 3,317 | MIT |
| tiktoken pypi Fast BPE tokenizer for OpenAI models enabling accurate token counting and text splitting. |
60 (0.5%) | 46.1M | 19.4K | — |
| tokenizers pypi Fast NLP tokenizer library by Hugging Face for text processing. |
32 (0.3%) | 43.7M | 11.2K | — |