ChatGPT Prompt History is a free Chrome add-on developed by wangyaozhiyz. This add-on falls under the Browsers category, specifically the Add-ons & Tools subcategory.

The main feature of ChatGPT Prompt History is the ability to navigate prompt history in the input textarea using the Up and Down arrow keys. This functionality allows users to easily access and reuse previous prompts, making the process of interacting with ChatGPT more efficient and convenient.

Overall, ChatGPT Prompt History is a useful tool for ChatGPT users who want to streamline their workflow and have quick access to previous prompts. It enhances the user experience by providing a simple and intuitive way to navigate prompt history within the input textarea.

Please note that the add-on is available for Chrome users and can be found on the developer's GitHub page.