Detection tools

Copyleaks

AI Plagiarism Checker

Freemium

Content authenticity platform pairing AI-writing detection with plagiarism checking across 60+ billion pages, built for institutions.

GPTZero

AI Detector

Freemium

AI-writing detector built by Edward Tian that flags text from ChatGPT, Claude, and Gemini using perplexity and burstiness.

Hive Moderation

AI Content Moderation

Freemium

Content moderation and AI-detection APIs — flag NSFW, violence, hate, and AI-generated media at platform scale.

Originality.ai

AI Content Detector

Paid

AI content and plagiarism detector built for content publishers — scans for GPT, Claude, and Gemini text plus plagiarism in one pass.

Sapling AI Detector

AI Content Detector

Freemium

AI content detector paired with real-time grammar and writing suggestions, plus an API for teams.

Turnitin AI Detection

AI Content Detector

Paid

The academic integrity standard — detects AI-generated writing and plagiarism in student submissions.

Winston AI

AI Detector

Freemium

AI content detector built for publishers and educators — 99.98% accuracy detecting ChatGPT and Claude.

ZeroGPT

AI Content Detector

Freemium

Free AI content detector that flags ChatGPT, GPT-4, and Gemini text with a percentage score and sentence highlighting.