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LangSmith

Trace, evaluate, deploy, and run agents with compute/storage units and a model gateway.

Free accessFree plan1 seat, 5,000 base traces, 5 Fleet LCU, and 5 LCU + 1 LSU sandbox/month.
Paid fromPlusUnlimited seats at per-seat price

At a Glance

LangSmith is an AI tool for Agent & RAG frameworks (category: Development & Code). Free access: Free plan. Paid from $39 (Plus). Documented: 5 plans with prices and limits.

Category
Agent & RAG frameworks
Paid from
$39 / Month (Plus)
Free Option
Free plan
Plans
5
Sources
3 verified sources
Website
langchain.com (opens in a new tab)

Category: Development & Code · Agent & RAG frameworks

Features

LangSmith is the commercial observability, evaluation, and deployment platform in the LangChain ecosystem. It also works with other agent frameworks and stores runs as traces with selectable retention.

Developer is free for one user and 5,000 traces. Plus costs $39/seat, includes 10,000 traces per organisation, and unlocks deployment and Engine. At scale, trace retention and LCU/LSU costs dominate seat price.

Prices and plans

TierPricePeriodWhat you get
DeveloperfreeMonth1 seat
5,000 base traces/month
14-day base retention
5 Fleet LCU/month included
5 LCU + 1 LSU sandbox usage and up to 10 sandboxes
Plus$39MonthUnlimited seats at per-seat price
10,000 base traces/month per organisation
1 small serverless deployment included
25 Fleet LCU/month
Engine, tuned evaluators, and deployment access
Trace usage$0.0005 / $0.005Usage14-day base retention
400-day extended retention
Extended upgrade adds $0.0045 on top of the base trace
Multiple events may belong to one trace
LCU / LSU usage$1.50 / $1UsageLCU for compute, Engine, Fleet, deployments, and sandboxes
LSU for database, memory, and storage
Engine about 5-30 LCU/successful run
Tuned perceived error 0.01 LCU/run
Enterprisecontact salesYearCloud, hybrid, or self-hosted
Custom SSO, ABAC, and RBAC
Custom seats/workspaces and SLA
EU or US cloud or own VPC

Prices per vendor, excl. taxes/VAT where applicable.

Limits

Developer includes 5,000 and Plus 10,000 base traces per month. Usage beyond that is metered: one LCU costs $1.50 and one LSU costs $1. Actual consumption depends on agents and resources used; no daily or per-task price is derived.

Alternatives and similar tools to LangSmith

A selection for “Agent & RAG frameworks” and curated direct comparisons. Direct comparisons carry the most weight, followed by the shared subcategory and shared tasks. Matching free-access types carry less weight. Ties are resolved consistently. No quality rating.

T
TrueForgeOpen-source, vendor-neutral agent harness (MIT) with sandbox, sessions, subagents, and approvals, self-hosted via a single npx command.Harness (MIT, self-hosted)AutoGPTAutoGPT builds and operates AI agents with a visual builder or chat, file processing, triggers and schedules. Cloud subscription and workflow usage are billed separately.Pro CloudLangflowVisual low-code builder for assembling AI agents, RAG applications and MCP servers by drag and drop and exposing them as an API.not publishedJevStationSeparate workspace for typed decisions with Jev, Clef, Perplexity Decider and OpenAI Luna Decisions on the same API key.5,000 creditsExaProvide web search, crawling, contents, monitoring, and deep-research agents through an API.Search & contentsHaystackOpen-source framework for RAG pipelines and AI agents from the German vendor deepset, free to use under the Apache-2.0 license; optionally paired with the hosted deepset AI Platform, which has a free Studio tier.deepset AI Platform - EnterpriseMicrosoft AutoGenMaintain existing multi-agent applications and migrate them to Microsoft Agent Framework.Microsoft Agent Framework 1.0Volcengine ArkByteDance Volcengine's official enterprise API/MaaS platform for the Doubao/Seed model family.Doubao-Seed-Evolving API

LangSmith alternatives comparison →

FAQ

Is LangSmith available for free?

Yes. A permanently free plan is published, not a time-limited trial. 1 seat, 5,000 base traces, 5 Fleet LCU, and 5 LCU + 1 LSU sandbox/month.

Where is the vendor of LangSmith based?

LangChain, Inc. is based in the USA. Regardless of that location, data processing and privacy terms are governed by the vendor's own contract.

How is LangSmith billed?

Developer includes one seat and 5,000 base traces. Plus costs $39 per seat and includes 10,000 base traces and a small serverless deployment; additional usage is billed separately. There is no currency switch. "US or EU" refers only to the server location for data hosting, not to the price currency. Prices are in US dollars only.

How much does LangSmith cost?

The cheapest paid plan of LangSmith is Plus at $39. 5 plans are documented in total, each with its price and limits.

Is LangSmith currently available?

LangSmith is still active. Developer, Plus, and Enterprise offers with trace, deployment, Fleet, Engine, and sandbox metering.

How we compare

We compare free access, paid entry, plan limits, features and the listed official sources. Unsourced figures stay marked as not published.

Only confirmed entries appear in the catalog. Prices, plans and limits come from listed official vendor pages. Missing figures stay marked as not published. Search results are ordered by Task match by default; category and task lists are alphabetical. Both can be switched to Free access first; neither is a quality ranking. The vendor page always wins.

Edited and checked by the AI Compare Ninja team

Sources

All details regarding plans, limits, and features are based on official vendor documentation and the primary sources verified below.

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