LangSmith
Take agents from prototype to production. LangSmith gives you the tools to build, debug, evaluate, and ship reliable agents.
Our verdict
LangSmith is LangChain’s platform for tracing, evaluating and deploying agents. Its Developer plan is free for one seat, and Plus is $39 per seat a month (langchain.com/pricing, read 2026-10-02). Developer documentation and a public changelog are both maintained, which is a good sign for anything you intend to build on. Prices were checked by hand on 2026-10-02.
Reviewed by AI Review Rating desk review How we score
Pricing
- Free tierYes
- Public price listYes
We do not republish prices we have not checked by hand, because automated price extraction proved unreliable enough to mislead. The vendor’s own page has the current figures. Why we do this
View pricing on smith.langchain.comUser reviews
No one has reviewed LangSmith here yet. Reviews are moderated before they appear, and our own score is editorial and separate from user ratings, though once reviews land they do lift it.
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Side by side
| Tool | Our score | From | Free tier | Best for | |
|---|---|---|---|---|---|
| LangSmith this page | 3 | - | Yes | ||
| 🥇Netdata | 7.6 | - | Yes | ||
| 🥈Vector | 7 | - | Yes | ||
| 🥉WorldMonitor | 6.9 | - | Yes | ||
| MLflow | 6.7 | - | Yes | ||
| Braintrust | 5.5 | $4 | Yes | ||
| Artificial Analysis | 4.5 | - | - |
Articles on LangSmith
Questions
Is LangSmith free?
Yes, for one person. The Developer plan is $0 for 1 seat with up to 5,000 base traces a month, then pay as you go. Read on langchain.com/pricing on 2026-10-02.
How much does LangSmith cost?
On langchain.com/pricing (read 2026-10-02): Developer $0 for 1 seat, Plus $39 per seat a month with 10,000 base traces a month included, Enterprise custom. Usage beyond that is billed in LangChain Standard Units at $1.00 each; the page’s calculator puts 5 seats and 50,000 traces at $395 a month.
Does LangSmith have an API or developer docs?
Yes, LangSmith publishes developer documentation.
How is LangSmith scored here?
LangSmith scores 3 out of 10. That comes from a desk review of public evidence, which is capped at 8.5 out of 10: public pricing, documentation, maintenance signals and how much we could actually verify. Affiliate relationships are excluded from scoring entirely. The full rubric is published on our methodology page.