Prompt Toolbox is a free Chrome extension developed by AugmentedCamel. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools subcategory. The main purpose of this extension is to provide users with a convenient way to store and find reference text for prompts, making it a useful tool for writers.

With Prompt Toolbox, users can save their own writing styles or the styles of others. Whether it's Shakespearean prose, an informal email to a colleague, or a formal writing style for legal purposes, this extension allows users to access and modify reference text easily. It provides a library of different writing styles, including the style of a local columnist or even the branding style of GoPro.

By copying and using the reference text provided, users can output messages in any style they desire. Prompt Toolbox offers a simple and accessible solution for writers looking to enhance their creativity and efficiency when it comes to prompts.