Gmail Email Rewriter is a free Chrome add-on designed to improve email communication by employing an on-device LLM based on Ploum's philosophy. This innovative tool rewrites emails directly within the Gmail interface, ensuring that users can maintain effective asynchronous communication. With features like inline rewritten emails, smart detection for necessary rewrites, and the ability to force a rewrite for different results, it offers a seamless experience for users looking to refine their email exchanges.

The add-on operates entirely on the user's device, utilizing WebGPU for the Phi-3.5-mini AI model, which means that no data is sent to external servers. It includes local caching for quicker access to previously rewritten emails and allows users to toggle the display of rewritten content on or off easily. Users need a Chrome browser with WebGPU support and approximately 2GB of storage for the initial download of the AI model, which takes a few minutes during the first use.