LangSmith
AI Agent & LLM Observability Platform
VS
LM Arena
The crowdsourced open platform for evaluating LLMs through human preference
Detailed comparison
Criteria
LangSmith
LM Arena
Pricing
Freemium
Free
Plans & pricing
Developer: Free, Team: $39/mo, Enterprise: Custom
—
Free trial
No
—
Audience
b2b
b2b
Platforms
Web
—
API
Yes
—
Open Source
Proprietary
—
Integrations
Pagerduty
—
Categories
Dev & Tech, information technology & services, Apps
Dev & Tech, research, Web Development
Popularity
Very High
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...
LM Arena, also known as Chatbot Arena, is a benchmarking platform where users compare AI models side-by-side. By engaging in blind battles, users vote...
Pricing
LangSmith
Freemium
LM Arena
Free
Plans & pricing
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
LM Arena
—
Free trial
LangSmith
No
LM Arena
—
Audience
LangSmith
b2b
LM Arena
b2b
Platforms
LangSmith
Web
LM Arena
—
API
LangSmith
Yes
LM Arena
—
Open Source
LangSmith
Proprietary
LM Arena
—
Integrations
LangSmith
Pagerduty
LM Arena
—
Categories
LangSmith
Dev & Tech, information technology & services, Apps
LM Arena
Dev & Tech, research, Web Development
Popularity
LangSmith
Very High
LM Arena
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...
LM Arena
LM Arena, also known as Chatbot Arena, is a benchmarking platform where users compare AI models side-by-side. By engaging in blind battles, users vote...
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
LM Arena
Blind model comparison
Elo rating leaderboard
Multi-model chat interface
Key differentiators
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
LM Arena
Other comparisons
FAQ: LangSmith vs LM Arena
LangSmith: AI Agent & LLM Observability Platform. LM Arena: The crowdsourced open platform for evaluating LLMs through human preference. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. LangSmith is freemium and LM Arena is free.
The best choice between LangSmith and LM Arena 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. LM Arena offers: Blind model comparison, Elo rating leaderboard, Multi-model chat interface.
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.