LangChain
LangChain is an end-to-end agent engineering stack that helps teams build, observe, evaluate, and deploy reliable AI agents.
Rate this app
LangChain Overview
Key Features & Capabilities
Debug non‑deterministic LLM behavior with end‑to‑end traces and live dashboards for costs, latency, and quality. Drill down into runs and tool calls to find failures fast and improve response quality.
Run online/offline evals, manage datasets, and collect human feedback with an annotation queue. Use evaluators to track accuracy, regressions, and reliability across iterations.
Ship agents with LangSmith Deployment: 1‑click deploy, real‑time streaming of intermediate steps, agent authorization, and horizontally scalable services. Access a 30+ endpoint Assistants API with state and memory, cron scheduling, and auth.
Automatically discover clusters of similar conversations to surface what users want and pinpoint systemic issues. Quickly find and remediate recurring problems across runs.
Choose Cloud, Hybrid, or Self‑Hosted in your VPC. Enable SSO, role‑based access, procurement/Infosec workflows, and SLAs to meet enterprise security and compliance needs.
Pricing Plans
Developer (Free)
- 5k base traces/month included; pay‑as‑you‑go thereafter
- LangSmith Observability & Evaluation: Tracing, Monitoring, Insights (beta)
- Online & offline evals, dataset collection, annotation queue
- Prompt Hub & Playground; bulk data export
- SSO via Google/GitHub; community Slack support
- Monthly self‑serve billing
- Hourly rate limits apply (see docs)
Plus
- 10k base traces/month included; pay‑as‑you‑go thereafter
- 1 free Dev deployment with unlimited node executions
- Additional deployments: $0.001 per node execution
- Uptime: $0.0007/min (Dev) and $0.0036/min (Production)
- All Observability & Evaluation features (tracing, monitoring, evals, datasets, annotation queue)
- Deployment features: LangSmith Studio, MCP server, real‑time streaming, Agent Authorization (beta), 1‑Click Deploy
- Assistants API (30+ endpoints) with state, memory, cron scheduling, and auth
- Cloud hosting fully managed by LangChain; data in US or EU
- Organization roles (User/Admin); email support
- Monthly self‑serve billing
Enterprise
- Custom trace allocation and usage limits
- Cloud, Hybrid (SaaS control plane + self‑hosted data plane), or Self‑Hosted (your VPC)
- Data location: Cloud US/EU or your VPC
- Custom SSO, RBAC, and advanced admin controls
- Team trainings, architectural guidance, access to deployed engineers
- SLA and custom terms; annual invoicing
- All Plus features, with enterprise procurement and Infosec review
Base traces: 14‑day retention at $0.50 per 1k; Extended traces: 400‑day retention at $5.00 per 1k; upgrade base to extended at $4.50 per 1k. Plus includes 1 free Dev deployment; after that, usage is billed by node executions and uptime. Startup Plan available with discounted rates (eligible for 1 year, then graduates to Plus). See docs for hourly ingestion and event limits.
Pros & Cons
Pros
- Deep agent observability with step‑level tracing, cost/latency/error tracking, and business dashboards.
- Integrated evals, datasets, and human feedback workflows to continuously improve agent reliability.
- Production‑grade deployment with 1‑click deploy, real‑time streaming, and horizontally scalable services.
- Flexible hosting (Cloud, Hybrid, Self‑Hosted) to meet data residency and compliance requirements.
- OTel support and framework‑agnostic integration, plus an Assistants API with 30+ endpoints for stateful agents.
Cons
- ×Usage‑based costs (traces, node executions, uptime) can make monthly spend variable and harder to predict.
- ×Developer tier is limited to a single seat and no managed deployment capacity beyond core observability.
- ×Plus plan caps seats at 10 and is Cloud‑only; advanced hosting (Hybrid/Self‑Hosted) requires Enterprise.
- ×Dev‑sized deployments are intended for testing and lack horizontal scaling, backups, and production optimizations.
- ×Insights is labeled beta, which may limit stability or features for large‑scale analytics use cases.
Frequently Asked Questions
Which plan is right for me?
Developer is best for personal projects and includes 1 free seat and 5k base traces/month. Plus is for teams needing self‑serve collaboration, 10k base traces/month, and 1 free dev deployment. Enterprise is for advanced security, admin, and hosting options (Cloud, Hybrid, or Self‑Hosted).
Do you offer a Startup Plan?
Yes. Early‑stage companies can apply for discounted LangSmith pricing with generous free trace allotments. Eligibility lasts 1 year before graduating to the Plus plan.
How am I billed?
Developer and Plus seats are billed monthly (prorated if added mid‑month; no credit for removed seats). Trace usage is billed monthly in arrears. Enterprise plans are invoiced annually upfront.
What is a trace, and what’s the difference between base and extended traces?
A trace is a single execution of your app (agent, evaluator, or playground) and can contain many events. Base traces have 14‑day retention at $0.50/1k; extended traces have 400‑day retention at $5.00/1k. You can upgrade base to extended for $4.50/1k.
I’ve used up my free traces—what can I do?
Add a credit card on the Developer or Plus plan to continue sending traces. If you hit performance limits, upgrade plans or contact support@langchain.dev.
Does LangSmith support OpenTelemetry (OTel)?
Yes. LangSmith supports OTel so you can unify your observability stack across services. Your app can be written in Python or TypeScript—or other languages—when using OTel.
Can I use Observability without Evaluation?
Yes. Observability and Evaluation are decoupled—you can use either (or both). All plans provide access; you only pay for what you use.
Can I self‑host LangSmith so data never leaves my environment?
Yes, on the Enterprise plan. LangSmith can be delivered to your Kubernetes cluster (AWS, GCP, or Azure) so data remains in your environment.
Where is my data stored on the hosted service?
For smith.langchain.com, data is stored in GCP us‑central‑1. Enterprise deployments can run in your own cloud or VPC to meet residency needs.
Will LangSmith add latency to my application?
No. The SDK sends traces via an asynchronous callback handler to a trace collector, so your application performance is not blocked by LangSmith.
Does Plus include a free deployment and are there caps?
Plus includes 1 free dev‑sized agent deployment. All usage in this dev deployment is free with no cap on node executions.
When should I use a dev‑sized vs. production‑sized deployment?
Use dev‑sized deployments for testing—they don’t support horizontal scaling, backups, or performance optimizations. Use production‑sized deployments for any customer‑facing agent.
Sign up for free
Join thousands of developers who are already using LangChain to enhance their workflow and productivity.
More AI & LLM APIs
Anthropic
Anthropic builds Claude, a family of frontier AI models and tools designed to be safe, reliable, and useful for both individuals and organizations.
Groq
GroqCloud is a high-performance AI inference platform built to deliver ultra-low latency, predictable cost, and production-grade reliability for real-world applications.
Claude
Claude is a next-generation AI assistant from Anthropic designed to help individuals and teams create, code, research, and analyze faster with strong safety and reliability.
Google AI Studio
Google AI Studio is a developer-focused platform that streamlines the journey from prompt to production with Gemini and other Google AI models.
OpenAI
OpenAI o1 is a new family of frontier reasoning models designed to spend more time thinking before they respond, enabling stronger performance on complex tasks in science, coding, and math.