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LangSmith

A platform for tracing, evaluation and agent-development workflows.

Verdict
Use The public docs say it does what you need. We read the docs. We did not test it.
Maker
LangChain
Price / access
Developer $0/seat/month plus usage, up to 5,000 base traces/month. Plus $39/seat/month plus usage. Pricing source
Pricing checked
November 7, 2026
Primary source
www.langchain.com

We built this profile from public sources and didn't use the product ourselves. The price is what we saw on the day we checked, so it may have changed.

Who it’s for

Teams debugging and evaluating model-backed applications.

Why we said Use

What it is

A platform for tracing, evaluation and agent-development workflows. See the official documentation or product page. This profile describes public documentation, not a Loaded Tokens hands-on test.

Who it is for

Teams debugging and evaluating model-backed applications. Our recommendation is scoped to that job; it is not a universal winner.

The evidence behind Use

Visible traces and evaluation workflows address a real need once an application has multiple steps. The vendor page documents the underlying capability; the fit judgment is ours. No performance ranking, time saving or reliability result is implied.

Pricing and the catch

Developer $0/seat/month plus usage, up to 5,000 base traces/month. Plus $39/seat/month plus usage. Public pricing checked November 7, 2026. Prices are USD where stated and can change; taxes, region, annual commitments and extra usage may differ.

Observability data can expose user inputs; review retention and access before sending traces.

A sensible first workflow

Trace a sanitized example and label the exact step where the output fails. This is a suggested evaluation, not a test we ran. Decide what success looks like before opening the tool: what output is acceptable, what needs review and where the workflow must stop.

Bottom line: buy for the job, keep the exit route, and do not confuse a feature list with proof of results. Browse the company profile for the rest of the stack.

Sources

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