Notepad is described as 'Fast and distraction-free online writing space. Capture thoughts, take notes, and share instantly. Perfect for quick ideas, to-do lists, etc' and is a Text Editor in the office & productivity category. There are more than 50 alternatives to Notepad, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux, BSD and Flathub apps. The best Notepad alternative is Notepad++, which is both free and Open Source. Other great sites and apps similar to Notepad are Visual Studio Code, Sublime Text, VSCodium and Vim.
It's NOT free, at least not on Windows.