detectIncognito.js is a JavaScript library that efficiently detects private browsing modes across modern browsers including Chrome, Safari, Firefox, Edge, Brave, Opera, and MSIE. It provides a simple API to check if a user is in Incognito, Private Window, or InPrivate mode, making it useful for developers who need to handle private browsing scenarios in their web applications. The library is particularly valuable for analytics platforms, content providers, or any service that needs to adapt behavior based on a user's browsing privacy settings.