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The open-source, local-first alternative to LangSmith.

opensmith

The open-source, local-first alternative to LangSmith.

opensmith is to LangSmith what Ollama is to OpenAI — the local-first, privacy-first alternative.

Why opensmith?

	LangSmith	opensmith
Setup	Cloud account required	pip install opensmith
Data privacy	Sends traces to cloud	100% local, SQLite only
Framework	Best with LangChain	Works with any Python code
Cost	Free tier then paid	Free forever, open source
Offline	No	Yes
Docker	No	No
Dashboard	Hosted	localhost:7823

Why opensmith

LangSmith is powerful, but it is built around cloud-hosted tracing and is most natural inside the LangChain ecosystem. opensmith is a local-first alternative: install it with pip, use it with any Python LLM pipeline, and inspect traces on your machine without accounts, hosted services, Docker, or configuration. No trace data leaves your machine.

Install

pip install opensmith

Quickstart

Example 1: @trace decorator

from opensmith import trace


@trace
def call_llm(prompt: str):
    return openai.chat.completions.create(
        model="gpt-4o-mini",
        messages=[{"role": "user", "content": prompt}],
    )


@trace
def my_pipeline(question: str):
    # search_docs is your own retrieval function
    docs = search_docs(question)
    return call_llm(docs + question)

Async functions are supported:

from opensmith import trace


@trace(tags=["production", "rag"])
async def call_llm(prompt: str):
    return await openai.chat.completions.create(
        model="gpt-4o-mini",
        messages=[{"role": "user", "content": prompt}],
    )

Example 2: context manager

from opensmith import trace


with trace("my_pipeline", tags=["debug"]) as t:
    t.log("query", query)
    response = openai.chat.completions.create(
        model="gpt-4o-mini",
        messages=[{"role": "user", "content": query}],
    )
    t.log("response", response)

Example 3: autopatch() zero code changes

from opensmith import autopatch


autopatch()

Patch only selected backends:

from opensmith import autopatch


autopatch(only=["openai"])

Patch everything except selected backends:

from opensmith import autopatch


autopatch(exclude=["chromadb"])

Console mode

Print trace results to the terminal as they complete:

from opensmith import set_console_mode, trace


set_console_mode(True)


@trace
def my_func():
    return "ok"

Configuration

opensmith reads opensmith.json from the current working directory on import:

{
  "db_path": "./my_traces.db",
  "console_mode": false,
  "autopatch": ["openai", "qdrant"]
}

Dashboard

opensmith ui

Open http://localhost:7823.

CLI reference

Command	Description
opensmith ui	Start the local dashboard at localhost:7823.
opensmith traces	List recent traces in the terminal.
opensmith stats	Show aggregate trace, step, token, and cost statistics.
opensmith clear	Delete all locally stored traces after confirmation.

Supported backends

Backend	Package	Status
openai	openai	✅
anthropic	anthropic	✅
litellm	litellm	✅
qdrant	qdrant-client	✅
chromadb	chromadb	✅
pinecone	pinecone-client	✅

Storage

Traces are stored locally at ~/.opensmith/traces.db unless overridden with opensmith.json or set_default_db_path().

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License

MIT