Fact Checker is a Chrome extension that allows users to fact check highlighted text using AI. The program utilizes Perplexity's API to instantly fact check information. Users need a Perplexity Pro account and API key to access the tool. By highlighting text on a webpage and selecting "Fact Check with AI," users can view truth percentage, fact check summary, contextual information, and source citations.

The tool is beneficial for students, journalists, internet users, professionals, and anyone who values truth and accuracy in information. Privacy-wise, only highlighted text and the current page URL are sent to the Perplexity API for fact-checking, ensuring no personal data is collected or stored.