Base trace retention is 14 days; extended traces are retained for 180 days for an additional fee.
Teams using traces for longer-term review or regression analysis should account for retention settings and associated usage charges.
Evidence source ↗
LangSmith
LangSmith helps teams trace, evaluate, and monitor LLM applications and AI agents, with optional agent deployment and related engineering services.
6 key claims verifiedOur editorial team checked this profile against company information, pricing information, product documentation. Supported by 4 documented sources.
Editorial overview
Aggregated Overview
The product combines tracing, offline and online evaluations, datasets, and monitoring, with optional deployment and agent-engineering products. G2 review summaries praise trace visibility but flag a learning curve. Pricing includes seat fees and usage-based charges, so value depends on workload.
This profile combines documented product information and independent evidence where available. It is not a hands-on test unless TechZella explicitly identifies one.
Overview
LangSmith is LangChain’s platform for tracing, evaluating, and monitoring LLM applications and AI agents. Teams can inspect execution traces, build datasets from runs, compare application versions, and run offline or online evaluations.
The platform also offers agent deployment and newer agent-engineering products. It is designed for developers and teams building AI systems, including those using frameworks beyond LangChain. Cloud plans are self-serve; Enterprise adds hybrid and self-hosted deployment options.
LangSmith Decision Snapshot
A quick way to understand who this product may suit, where its limits matter, and which facts are most relevant before you compare alternatives.
Best suited to
AI engineering teams that need to inspect multi-step LLM or agent executions, evaluate versions against datasets, and use production traces to guide debugging and quality improvement.
Look elsewhere if
Teams seeking a simple logging-only product, or teams that require self-hosting on a lower-tier plan, may find the feature set, metered usage, and enterprise deployment boundaries unsuitable, and should evaluate alternatives such as Langfuse or Braintrust instead.
Platforms
API, Cloud, JavaScript, Python, Web
TechZella assessment
8.1/10
LangSmith — What Sets It Apart?
These are the product-specific differences that may matter when deciding whether the software fits your workflow. They are based on documented evidence rather than a universal ranking.
- Connects traces to datasets, offline and online evaluations, and annotation workflows, supporting an iterative development-to-production feedback loop.
- Offers optional LangSmith Deployment, Engine, Fleet, and Sandboxes alongside observability and evaluation.
- Cloud, hybrid, and self-hosted options are available on Enterprise, with different control-plane and data-plane arrangements.
LangSmith Pros & Cons
Pros
- Connects trace inspection with dataset-based evaluation and production monitoring.
- Supports offline and online evaluations, including LLM-as-a-judge and code evaluators.
- Offers Python and JavaScript SDK workflows and API access.
- Enterprise hosting includes cloud, hybrid, and self-hosted options.
Cons
- Usage-based charges apply beyond included plan allowances and may vary with workload.
- Base trace retention is limited to 14 days; extended retention costs extra.
- G2 review information notes a learning curve and reports interface complexity from some reviewers.
- Self-hosted and hybrid deployment are Enterprise options rather than standard lower-tier offerings.
LangSmith Gotchas & Operational Limits
These are documented constraints or practical friction points that may matter before you adopt the product.
The Developer plan includes one seat and 5,000 base traces monthly, with usage charges thereafter.
A free starting plan does not mean unlimited multi-user or trace-volume use.
Evidence source ↗Cloud deployment and self-hosted or hybrid data-plane options are not available on the same plan terms.
Organizations with data-residency or operational-control requirements should confirm Enterprise hosting and support requirements before implementation.
Evidence source ↗LangSmith Pricing & Plans
Developer
$0
month
One seat and up to 5,000 base traces monthly; additional usage is pay-as-you-go.
Check current pricing →Plus
$39
seat/month
Includes up to 10,000 base traces monthly, access to Deployment and other services, and additional seats; usage is pay-as-you-go.
Check current pricing →Enterprise
Custom pricing
custom
For teams needing advanced hosting, security, support, or deployment options.
Check current pricing →Pricing may change. Verify current plans on the vendor's website.
LangSmith Competitors & Alternatives
Compare similar products directly, then see which alternatives may make more sense when your requirements differ.
At a glance
Developer Tools| Decision factor | LangSmith | Langfuse | Braintrust |
|---|---|---|---|
| Core scope | Tracing, evaluation, monitoring, and additional agent engineering services. | Open-source and cloud LLM engineering platform covering tracing, prompt management, datasets, and evaluations. Source ↗ | Tracing, evaluations, datasets, experiments, and production observability, with a product emphasis on eval workflows. Source ↗ |
| Hosting model | Cloud for Developer and Plus; Enterprise adds hybrid and self-hosted options. | Cloud service or self-hosted open-source deployment; paid self-hosted enterprise features are also offered. Source ↗ | Enterprise offers hosted or on-prem deployment for high-volume or privacy-sensitive data. Source ↗ |
| Pricing model | Developer is $0 per seat monthly; Plus is $39 per seat monthly; usage is additionally metered. | Hobby is free; paid cloud plans include usage allowances and charge for additional billable units. Source ↗ | Starter is $0 monthly with included credits, data, and scores; Pro is $249 monthly, with additional usage charges. Source ↗ |
Only factors supported by the available research are shown. The comparison is descriptive, not a ranking.
Direct competitors
These products address broadly similar requirements. The descriptions focus on documented reasons a buyer might compare them with LangSmith.
LangfuseOpen-source and cloud LLM engineering platform covering tracing, prompt management, datasets, and evaluations.
BraintrustTracing, evaluations, datasets, experiments, and production observability, with a product emphasis on eval workflows.
LangSmith Features
Observability
- Trace application executions and inspect tracked steps
- Review production runs and filter traces
- Monitor agent behavior using online evaluations
Evaluation
- Run offline evaluations against datasets
- Use LLM-as-a-judge and code evaluators
- Compare application versions and experiments
Development and deployment
- Create datasets from application runs
- Deploy agents through LangSmith Deployment
- Use Engine, Fleet, and Sandboxes as separately metered product services
Developer access
- Python and JavaScript SDK workflows
- API access documented by LangChain
- Integrate trace instrumentation with LangChain model integrations
Demo & Screenshots
LangSmith Specifications
| Cloud regions | US or EU, according to the pricing page |
|---|---|
| Self-hosted data location | Customer VPC, Enterprise |
| Base trace retention | 14 days |
| Extended trace retention | 180 days, additional fee |
| SDK languages | Python and JavaScript |
| Deployment options | Cloud, hybrid, and self-hosted on Enterprise |
| API | Documented API endpoints and SDK workflows |
| Free usage | Developer plan includes one seat and 5,000 base traces monthly |
Deployment & System Footprint
Verified installation, hosting, administration, or environment details that can affect implementation.
| Installation or hosting | Developer and Plus plans use cloud hosting. Enterprise supports cloud, hybrid with a SaaS control plane and self-hosted data plane, or fully self-hosted deployment. Source ↗ |
|---|---|
| Cloud data location | The pricing page lists LangChain Cloud in the US or EU; self-hosted Enterprise data resides in the customer's VPC. Source ↗ |
Migration & Lock-In
Documented portability, standards, export, or switching considerations. No switching-cost score is shown unless the evidence supports one.
Data portability
The official materials reviewed describe trace and dataset workflows, but do not establish a general migration service or a complete export-and-import process. Verify export requirements and formats with LangChain before switching.
Evidence source ↗Our evidence-based assessment
TechZella Score
A proprietary editorial score based on product capabilities, usability, value, performance, support and user sentiment evidence.
8.1/10Moderate confidence
The product combines tracing, offline and online evaluations, datasets, and monitoring, with optional deployment and agent-engineering products. G2 review summaries praise trace visibility but flag a learning curve. Pricing includes seat fees and usage-based charges, so value depends on workload.
Methodology v1.0. The assessment weighs feature coverage (25%), ease of use (15%), value for money (20%), performance (15%), support (10%) and user sentiment (15%), using researched product evidence and verified review evidence where available. It is a TechZella editorial assessment, not a direct user-review average.
Editorial transparency
Our Review Methodology
Key claims are linked to the sources used to verify them. This evidence record is separate from third-party user ratings.
TechZella evaluates software using documented product capabilities, pricing information, usability and value considerations, independent user evidence where available, and competitive context. The assessment is an editorial review, not a hands-on test unless one is explicitly identified. Our editorial assessment is based on 4 documented sources.
What TechZella adds
- Connects traces to datasets, offline and online evaluations, and annotation workflows, supporting an iterative development-to-production feedback loop.
- Offers optional LangSmith Deployment, Engine, Fleet, and Sandboxes alongside observability and evaluation.
- Cloud, hybrid, and self-hosted options are available on Enterprise, with different control-plane and data-plane arrangements.
Important limitations
- Base traces are retained for 14 days; extending retention to 180 days incurs an additional fee.
- Usage beyond included trace allowances and some product services is metered, so total spend depends on activity as well as seat count.
- G2's review summary identifies a learning curve; individual reviewers also mention interface complexity and navigation friction.
Evidence-backed claimsLangSmith combines tracing and evaluation capabilities for AI applications and agents. The Developer plan includes one seat and 5,000 base traces per month; Plus is listed at $39 per seat monthly with 10,000 base traces. Base traces have 14-day retention and extended traces have 180-day retention. LangSmith supports offline and online evaluation, including LLM-as-a-judge and code evaluators. Enterprise hosting options include cloud, hybrid, and self-hosted configurations. G2 displayed a 4.4 out of 5 rating from 95 LangSmith reviews on the accessed page.
The company describes LangSmith as its commercial platform for observability, evaluation, and agent development; product materials detail tracing and evaluation workflows.
View source ↗Verified 2026-11-12The official pricing page lists both plan prices and included trace allowances.
View source ↗Verified 2026-11-12The official pricing FAQ states the two retention periods and that extended retention costs extra.
View source ↗Verified 2026-11-12Official documentation describes evaluation types and evaluator implementations for offline datasets and online production runs.
View source ↗Verified 2026-11-12The pricing page identifies these options and describes the hybrid control plane and data plane.
View source ↗Verified 2026-11-12The G2 page displayed the rating and review count and summarized user feedback about trace visibility and learning curve.
View source ↗Verified 2026-11-12LangSmith FAQs
Answers begin with the clearest available response, followed by the context that helps you act on it.
Does LangSmith have a free plan?
Yes. The Developer plan is free, includes one seat and 5,000 base traces monthly, and charges for usage beyond the included allowance.
How much does LangSmith Plus cost?
The official pricing page lists Plus at $39 per seat per month, with 10,000 base traces monthly and usage charges thereafter.
How long are LangSmith traces retained?
Base traces are retained for 14 days. Extended traces are retained for 180 days and cost extra.
Can LangSmith be self-hosted?
Yes. The pricing page lists self-hosted deployment as an Enterprise option; Enterprise also offers hybrid hosting.
Does LangSmith train models on customer traces?
No. LangChain says it does not use LangSmith customer data to train models.
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