CaptiPrep is a Chrome extension designed to assist English learners by extracting key vocabulary and phrases from YouTube video subtitles. This AI-powered tool allows users to preview essential content before engaging with the video, making the learning experience more efficient and enjoyable. With features such as automatic subtitle extraction, smart filtering, and one-click study card creation, users can easily compile personalized study materials.

The extension operates directly on YouTube, providing an in-page overlay that simplifies the extraction process. Users can also access a vocabulary notebook that saves their study history and favorites, allowing for easy review and export. Configurable settings for LLM providers ensure a tailored experience, making CaptiPrep a valuable resource for anyone looking to enhance their English language skills through video content.