GPTZero
Checks text for AI-generated writing, verifies citations and replays how a Google Doc was written, aimed at teachers and students.
Chrome extension
Checks whether text reads as AI-written from a Chrome side panel and helps you edit sentences that sound robotic or machine-made.
ContentDetector.ai places an AI-writing detector and text editor in Chrome's side panel. It is for writers and editors who want sentence-level signals about text that reads as machine-made, and a place to revise those passages.
Open the ContentDetector.ai side panel, then paste text, write in the editor or choose Scan URL to pull in the page you are viewing.
Detection results are writing signals, not proof of authorship, as the developer itself notes. Free scans are limited, and text you scan is sent to the developer's service.