LangSmith
AI Agent & LLM Observability Platform
VS
promptfoo
The AI Security Platform that catches vulnerabilities.
Detailed comparison
Criteria
LangSmith
promptfoo
Pricing
Freemium
Freemium
Plans & pricing
Developer: Free, Team: $39/mo, Enterprise: Custom
Community: Free, Enterprise: Custom
Free trial
No
No
Audience
b2b
b2b
Platforms
Web
Web, Cli, Api
API
Yes
Yes
Open Source
Proprietary
Open Source
Integrations
Pagerduty
—
Categories
Dev & Tech, information technology & services, Apps
Dev & Tech, information technology & services, Prompt testing
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...
Promptfoo is an AI security platform designed to identify and fix vulnerabilities in AI applications during development. It helps developers proactive...
Pricing
LangSmith
Freemium
promptfoo
Freemium
Plans & pricing
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
promptfoo
Community: Free, Enterprise: Custom
Free trial
LangSmith
No
promptfoo
No
Audience
LangSmith
b2b
promptfoo
b2b
Platforms
LangSmith
Web
promptfoo
Web, Cli, Api
API
LangSmith
Yes
promptfoo
Yes
Open Source
LangSmith
Proprietary
promptfoo
Open Source
Integrations
LangSmith
Pagerduty
promptfoo
—
Categories
LangSmith
Dev & Tech, information technology & services, Apps
promptfoo
Dev & Tech, information technology & services, Prompt testing
Popularity
LangSmith
Very High
promptfoo
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...
promptfoo
Promptfoo is an AI security platform designed to identify and fix vulnerabilities in AI applications during development. It helps developers proactive...
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
promptfoo
Proactive identification of AI vulnerabilities (e.g., jailbreaks, data leaks)
Detection of business rule violations and insecure tool use in agents
Integration with CI/CD pipelines (GitHub, GitLab, Jenkins)
Support for MCP and Agent frameworks
Flexible deployment: on-premise or cloud
Open-source tool available for individual developers and small teams
Key differentiators
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
promptfoo
- Proactive AI vulnerability detection
- CI/CD integration for AI security
- Supports MCP & Agent frameworks
Other comparisons
FAQ: LangSmith vs promptfoo
LangSmith: AI Agent & LLM Observability Platform. promptfoo: The AI Security Platform that catches vulnerabilities.. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. LangSmith is freemium and promptfoo is freemium.
The best choice between LangSmith and promptfoo 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. promptfoo offers: Proactive identification of AI vulnerabilities (e.g., jailbreaks, data leaks), Detection of business rule violations and insecure tool use in agents, Integration with CI/CD pipelines (GitHub, GitLab, Jenkins), Support for MCP and Agent frameworks.
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.