GPTZero

What it does

GPTZero detects machine-generated text with sentence-level highlighting. Teams use it to vet supplier-written copy, spot fully-outsourced content and understand what they are actually paying writers for.

Detection is probabilistic — treat scores as signal, not verdicts. Free tier for occasional checks; API for bulk scanning.

Standout features

• Sentence-level AI-probability highlights
• Bulk scanning via API
• Plagiarism checking on paid plans
• Educational and business dashboards

Best for