LangSmith

by LangChain

See each step your agent takes, then test and score it.

Observabilityfrom $39/seat/mo

Visit site More observability
Pricing
from $39/seat/mo
Free tier
5k traces/mo free
Category
Observability
Maker
LangChain
Website
langchain.com
Last verified
October 20, 2026

What you can do

  • Watch an agent work step by step
  • Find what hurts cost and speed
  • Test changes before they ship

Pricing

from $39/seat/moFree tier

Free Developer seat with 5k traces a month, then pay as you go. Plus $39 per seat a month with 10k traces.

Prices change, so confirm on the official site before you buy.

More observability power-ups

LangfuseOpen-source tracing, evals and prompt management for agents.BraintrustTrace every agent run and test changes before they ship.

Sources

Name, maker, link and price checked on the official site on October 20, 2026.

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