Studyflow is a browser extension for Chrome and Edge designed for learning on YouTube. It provides a study mode that removes distracting elements such as Shorts, recommendations, and video feeds, while simplifying the YouTube homepage and keeping supported advertisements out of view. The extension is intended for users who rely on YouTube for lectures, tutorials, and study-with-me videos, and who want a more focused viewing environment. The main feature set includes timestamped screenshot notes. Users can capture a video frame at a specific moment and attach their own explanation and tags to that capture. Each note retains its timestamp, the originating video link, tags, and the user's written commentary. These notes are stored in a library where they can be searched, sorted into separate note files, and exported as PDF or Markdown documents. All notes remain saved in the user's browser, and no account is required. Typical usage involves installing the extension, activating study mode on a video, and capturing frames that correspond to key concepts or explanations. Users can later review their captures in the library, organize them into subject-specific files, and export the material for use in other applications such as document editors or note-taking tools. The extension is available for both Chrome and Edge browsers, and its workflow is designed to be direct, with no complex configuration needed before the first use.