LangSmith
AI Agent & LLM Observability Platform
VS
LangWatch
AI Agent Testing, LLM Evaluation, and Observability Platform
Detailed comparison
Criteria
LangSmith
LangWatch
Pricing
Freemium
Freemium
Plans & pricing
Developer: Free, Team: $39/mo, Enterprise: Custom
Developer Plan: Free, Growth Plan: $34/mo, Enterprise Plan: Custom
Free trial
No
Yes
Audience
b2b
b2b
Platforms
Web
Web
API
Yes
Yes
Open Source
Proprietary
Proprietary
Integrations
Pagerduty
—
Categories
Data Science, Dev Tools
Data Science, AI Agents
Popularity
Very High
Very High
Description
LangSmith is a complete AI agent and LLM observability platform. It offers tracing and real-time monitoring to help developers debug agents, find fail...
LangWatch is an AI agent testing, LLM evaluation, and LLM observability platform. It allows users to test agents with simulated users, prevent regress...
Pricing
LangSmith
Freemium
LangWatch
Freemium
Plans & pricing
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
LangWatch
Developer Plan: Free, Growth Plan: $34/mo, Enterprise Plan: Custom
Free trial
LangSmith
No
LangWatch
Yes
Audience
LangSmith
b2b
LangWatch
b2b
Platforms
LangSmith
Web
LangWatch
Web
API
LangSmith
Yes
LangWatch
Yes
Open Source
LangSmith
Proprietary
LangWatch
Proprietary
Integrations
LangSmith
Pagerduty
LangWatch
—
Categories
LangSmith
Data Science, Dev Tools
LangWatch
Data Science, AI Agents
Popularity
LangSmith
Very High
LangWatch
Very High
Description
LangSmith
LangSmith is a complete AI agent and LLM observability platform. It offers tracing and real-time monitoring to help developers debug agents, find fail...
LangWatch
LangWatch is an AI agent testing, LLM evaluation, and LLM observability platform. It allows users to test agents with simulated users, prevent regress...
Features
LangSmith
Cost tracking
Online LLM-as-judge and code evals
Tool and agent trajectory monitoring
Webhook and Pagerduty alerts
Message threading for multi-turn chat interactions
Templates for error analysis
LangWatch
AI agent testing
LLM evaluation
LLM observability
Simulated user testing
Regression prevention
Issue debugging
Key differentiators
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
LangWatch
- AI agent testing & LLM evaluation
- LLM observability & debugging
- Simulated user testing
Other comparisons
FAQ: LangSmith vs LangWatch
LangSmith: AI Agent & LLM Observability Platform. LangWatch: AI Agent Testing, LLM Evaluation, and Observability Platform. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. LangSmith is freemium and LangWatch is freemium.
The best choice between LangSmith and LangWatch depends on your specific needs. Compare their features, pricing, and target audience on this page to find the tool that best fits your use case.
Both are primarily designed for individuals. The choice depends on which specific features you need.
LangSmith offers: Cost tracking, Online LLM-as-judge and code evals, Tool and agent trajectory monitoring, Webhook and Pagerduty alerts. LangWatch offers: AI agent testing, LLM evaluation, LLM observability, Simulated user testing.
Based on our data, LangSmith currently enjoys greater popularity. However, popularity isn't the only factor — compare features to find the right tool for your needs.