GPTKit

What it does

GPTKit is a web tool that classifies text as human-written or ChatGPT-generated. It uses six detection methods and reports an accuracy of about 93 percent. The first 2048 characters of each request are free for guests, and registering raises the character limit.

GPTKit gives a quick check on whether text looks machine-written. It runs six detection methods and shows a result with an authenticity report. Guests can submit up to 2048 characters per request at no cost, and a free account raises that limit. The site says English is the only supported language and that input is removed from its servers once processing finishes. The stated accuracy is about 93 percent, based on testing with a dataset of over 100,000 responses. Treat that number as a guide, not proof. For better results, the site suggests entering more than 50 words. The page mentions an API and a dashboard, but it does not describe pricing or paid plans.