GPTZero
The World's #1 AI Content Detector with over 8 Million Users
VS
LangSmith
AI Agent & LLM Observability Platform
Detailed comparison
Criteria
GPTZero
LangSmith
Pricing
Freemium
Freemium
Plans & pricing
Free: Free, Enterprise: Custom
Developer: Free, Team: $39/mo, Enterprise: Custom
Free trial
No
No
Audience
b2c
b2b
Platforms
Web
Web
API
No
Yes
Open Source
Proprietary
Proprietary
Integrations
—
Pagerduty
Categories
Security, information technology & services, AI content detection
Dev & Tech, information technology & services, Apps
Popularity
Very High
Very High
Description
GPTZero is the best free AI detector, trusted by over 8 million users. Simply paste your text to instantly get an overall AI score and advanced senten...
LangSmith is a complete AI agent and LLM observability platform. It offers tracing and real-time monitoring to help developers debug agents, find fail...
Pricing
GPTZero
Freemium
LangSmith
Freemium
Plans & pricing
GPTZero
Free: Free, Enterprise: Custom
LangSmith
Developer: Free, Team: $39/mo, Enterprise: Custom
Free trial
GPTZero
No
LangSmith
No
Audience
GPTZero
b2c
LangSmith
b2b
Platforms
GPTZero
Web
LangSmith
Web
API
GPTZero
No
LangSmith
Yes
Open Source
GPTZero
Proprietary
LangSmith
Proprietary
Integrations
GPTZero
—
LangSmith
Pagerduty
Categories
GPTZero
Security, information technology & services, AI content detection
LangSmith
Dev & Tech, information technology & services, Apps
Popularity
GPTZero
Very High
LangSmith
Very High
Description
GPTZero
GPTZero is the best free AI detector, trusted by over 8 million users. Simply paste your text to instantly get an overall AI score and advanced senten...
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...
Features
GPTZero
Multi-model AI detection (ChatGPT, GPT-5, Gemini)
Overall AI score and sentence by sentence analysis
Instant text pasting for detection
Scan potential AI text in any document
Free AI checking
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
Key differentiators
GPTZero
- Trusted by 8M+ users
- Advanced sentence-by-sentence AI detection
- Multi-model AI detection
LangSmith
- Complete AI agent & LLM observability
- Real-time tracing, debugging & evals
- Cost, latency & trajectory monitoring
Other comparisons
FAQ: GPTZero vs LangSmith
GPTZero: The World's #1 AI Content Detector with over 8 Million Users. LangSmith: AI Agent & LLM Observability Platform. Both tools take different approaches to address similar needs.
Both offer a free or freemium plan. GPTZero is freemium and LangSmith is freemium.
The best choice between GPTZero and LangSmith 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.
GPTZero is primarily designed for individuals, while LangSmith is built for individuals.
GPTZero offers: Multi-model AI detection (ChatGPT, GPT-5, Gemini), Overall AI score and sentence by sentence analysis, Instant text pasting for detection, Scan potential AI text in any document. LangSmith offers: Cost tracking, Online LLM-as-judge and code evals, Tool and agent trajectory monitoring, Webhook and Pagerduty alerts.
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.