LangSmith
AI Agent & LLM Observability Platform
VS
OpenRouter
The unified interface for LLMs. Find the best models & prices for your prompts.
Detailed comparison
Criteria
LangSmith
OpenRouter
Pricing
Freemium
Freemium
Plans & pricing
Developer: Free, Team: $39/mo, Enterprise: Custom
Free: Free, Pay-as-you-go: Custom, Enterprise: Custom
Free trial
No
No
Audience
b2b
b2b
Platforms
Web
Web, Api
API
Yes
Yes
Open Source
Proprietary
Proprietary
Integrations
Pagerduty
—
Categories
Dev & Tech, information technology & services, Apps
Operations, information technology & services, Productivity
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...
OpenRouter provides a unified API to access a wide array of Large Language Models from various providers. It helps users find the best models and pric...
Pricing
LangSmith
Freemium
OpenRouter
Freemium
Plans & pricing
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
OpenRouter
Free: Free, Pay-as-you-go: Custom, Enterprise: Custom
Free trial
LangSmith
No
OpenRouter
No
Audience
LangSmith
b2b
OpenRouter
b2b
Platforms
LangSmith
Web
OpenRouter
Web, Api
API
LangSmith
Yes
OpenRouter
Yes
Open Source
LangSmith
Proprietary
OpenRouter
Proprietary
Integrations
LangSmith
Pagerduty
OpenRouter
—
Categories
LangSmith
Dev & Tech, information technology & services, Apps
OpenRouter
Operations, information technology & services, Productivity
Popularity
LangSmith
Very High
OpenRouter
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...
OpenRouter
OpenRouter provides a unified API to access a wide array of Large Language Models from various providers. It helps users find the best models and pric...
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
OpenRouter
Unified API for all major LLMs
Access to 300+ models from 60+ providers
Pay-as-you-go pricing with credit system
Real-time model rankings and price comparison
Free tier with monthly requests
Key differentiators
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
OpenRouter
- Unified API for 300+ LLMs
- Real-time LLM price comparison
Other comparisons
FAQ: LangSmith vs OpenRouter
LangSmith: AI Agent & LLM Observability Platform. OpenRouter: The unified interface for LLMs. Find the best models & prices for your prompts.. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. LangSmith is freemium and OpenRouter is freemium.
The best choice between LangSmith and OpenRouter 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. OpenRouter offers: Unified API for all major LLMs, Access to 300+ models from 60+ providers, Pay-as-you-go pricing with credit system, Real-time model rankings and price comparison.
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.