A TechPP article describes how the author built a local offline course player using Claude Cowork. The author prefers learning offline by downloading entire catalogs, such as YouTube playlists or third-party courses, and using a Pomodoro timer for 45 minutes. Managing multiple courses and thousands of videos offline made tracking progress difficult, previously requiring manual notes. Using Claude, the author created a local course player that organizes courses into folders and tracks progress. Additional features were added, including a native Pomodoro timer for 45-minute focus sessions and autoplay for the next video, which websites lack by default. The guide explains how to use Claude Cowork to organize messy download folders, create a simple offline course tracker website, and add extra features. The article notes this can also be done with other co-working agents from OpenAI, such as ChatGPT Work, Codex, and Google’s Antigravity, or other AI models. The process is described as straightforward, with AI models handling the work. The article includes a table of contents with sections on building the player, creating an offline learning experience, and FAQs covering topics like cloud uploads, folder access safety, required Claude subscription, resource consumption, and backing up course progress.