Bellek - Smart Vocabulary Builder is a free Chrome extension designed to help users effortlessly build and retain their vocabulary while browsing the internet. This tool allows users to save words they encounter, receive instant definitions, and study them using innovative learning techniques. Key features include one-click saving of words, context capture that remembers the sentence where the word was found, and source tracking for easy reference. Users can also organize their saved words into collections based on topics or sources.

The program offers a range of free features, including the ability to save up to 30 words, unlimited flashcard study sessions, and progress tracking. For those seeking more extensive capabilities, premium features are available, such as unlimited word storage and collections, quiz modes, and a 7-day free trial. Bellek is particularly beneficial for language learners, students, and professionals looking to enhance their vocabulary efficiently.