BestLetter is a browser extension designed for Upwork users to create professional cover letters quickly. By pasting a job description and adding a few details, users receive an AI-generated cover letter tailored to the job. Created by Upwork professionals with 12 years of experience, it aims to help freelancers stand out and save time. The extension is easy to use and supports English. It also offers in-app purchases for additional features. BestLetter is not affiliated with Upwork.com but is a.