
The World's #1 AI Content Detector with over 8 Million Users

AI Agent & LLM Observability Platform
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.