LangSmith
AI Agent & LLM Observability Platform
VS
MLflow
Open Source AI Platform for Agents, LLMs & Models
Detailed comparison
Criteria
LangSmith
MLflow
Pricing
Freemium
Free
Plans & pricing
Developer: Free, Team: $39/mo, Enterprise: Custom
Free: Free
Free trial
No
No
Audience
b2b
b2b
Platforms
Web
Web, Cli
API
Yes
Yes
Open Source
Proprietary
Open Source
Integrations
Pagerduty
—
Categories
Dev & Tech, information technology & services, Apps
Dev & Tech, information technology & services, Apps
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...
MLflow is an open-source AI platform designed to manage the full lifecycle of agents, LLMs, and traditional machine learning models. It provides tools...
Pricing
LangSmith
Freemium
MLflow
Free
Plans & pricing
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
MLflow
Free: Free
Free trial
LangSmith
No
MLflow
No
Audience
LangSmith
b2b
MLflow
b2b
Platforms
LangSmith
Web
MLflow
Web, Cli
API
LangSmith
Yes
MLflow
Yes
Open Source
LangSmith
Proprietary
MLflow
Open Source
Integrations
LangSmith
Pagerduty
MLflow
—
Categories
LangSmith
Dev & Tech, information technology & services, Apps
MLflow
Dev & Tech, information technology & services, Apps
Popularity
LangSmith
Very High
MLflow
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...
MLflow
MLflow is an open-source AI platform designed to manage the full lifecycle of agents, LLMs, and traditional machine learning models. It provides tools...
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
MLflow
MLflow Tracking
Model Registry
LLM Tracking and Evaluation
AI Gateway
Observability
Key differentiators
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
MLflow
- 100% open-source, no vendor lock-in
- Manages full ML/LLM lifecycle
- Works across any cloud, framework, tool
Other comparisons
FAQ: LangSmith vs MLflow
LangSmith: AI Agent & LLM Observability Platform. MLflow: Open Source AI Platform for Agents, LLMs & Models. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. LangSmith is freemium and MLflow is free.
The best choice between LangSmith and MLflow 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. MLflow offers: MLflow Tracking, Model Registry, LLM Tracking and Evaluation, AI Gateway.
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.