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 highlighted text or images on any web page to estimate whether they were made with AI, including image metadata and watermark checks.
Winston AI checks text and images on any website, and in Google Docs, to estimate whether they were created with AI tools. It is aimed at publishers, educators and readers who need to assess where content came from.
Highlight text or right-click an image on a page and choose the Winston AI scan option to see its assessment.
Scores are estimates, not proof of origin. The developer states scans from the extension are not saved, though content is sent to its service for analysis.