ChatGPT is a user interface tool that enables users to add extra functionality to their conversations. Features include the ability to select and export conversations into multiple formats, search through conversations, change language, sync a copy of conversations locally, add history to user input, pin important messages, create a prompt library, add input history modal, word and character counters, copy chats, customize the continue button, select and delete a group of chats, enable/disable safe mode, and read an AI newsletter. All user data is saved locally on the user's computer, and the Auto Sync feature allows users to download a copy of all their conversations. User information is never sold.