How much does LangSmith cost?
As of Oct 16, 2026, LangSmith lists Developer ($0/mo), Plus ($39/mo), Custom seats and workspaces ($10000), LangChain Standard Units. ($1), LSU ($49/mo), and Add unlimited seats ($39/mo).
Infra · LangChain
LangSmith
Tracing and evals for LLM apps, with developer and plus plans.
Current plans
Captured Oct 16, 2026 · 10 currency amounts
| Plan | Price text | Billing |
|---|---|---|
| Developer | $0 / seat per month | / seat |
| Plus | $39 / seat per month | / seat |
| Custom seats and workspaces | We offer discounted rates and credits for VC-backed startups. Get up to $10,000 | — |
| LangChain Standard Units. | $1.00 / LSU | — |
| LSU | $49 / mo | / mo |
| Developer | $0 / seat | / seat |
| Plus | $39 / seat | / seat |
| Users | Maximum of 1 seat (free) | — |
| Add unlimited seats | $39 per seat/month | per seat |
| General Questions | Our Developer plan is a great choice for personal projects. You will have 1 free | /month |
| General Questions | Yes! We offer a Startup Plan for LangSmith, designed for early-stage companies b | — |
| General Questions | LangChain Standard Units ("LSUs") are the standard unit of measure for usage con | — |
Lines taken from the page
- $0 / seat per month
- $39 / seat per month
- We offer discounted rates and credits for VC-backed startups. Get up to $10,000 in credits.
- LangChain Standard Units. $1.00 / LSU
- $49 / mo
- $0 / seat
- $39 / seat
- Maximum of 1 seat (free)
- Add unlimited seats $39 per seat/month
- Our Developer plan is a great choice for personal projects. You will have 1 free seat with access to LangSmith (5k base traces/month included).
- Yes! We offer a Startup Plan for LangSmith, designed for early-stage companies building agentic applications. You’ll get discounted rates and generous free trace allotments to build with confidence from day one.
- LangChain Standard Units ("LSUs") are the standard unit of measure for usage consumption across all LangSmith products and features. The number of LSUs consumed depends on each product's metering rate and usage. 1 LSU = $1.
- Engine is metered in LSUs (LangChain Standard Units), which are consumed during each Engine run. 1 LSU costs $1.
Questions people ask
Is there a free LangSmith plan?
Yes. The Oct 16, 2026 capture includes a $0 plan.
When did LangSmith last change its price?
No cited LangSmith price change is in the log.
Price history
No dated pricing change for LangSmith is in the seed log. That is not a claim that the price never moved. The current extract is from Oct 16, 2026.
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