Nischi is a vocabulary builder platform that leverages artificial intelligence and spaced repetition with flashcards to enhance English vocabulary. Nischi keeps track of unfamiliar English words encountered during activities such as watching movies, TV shows, news, YouTube videos, or attending online/offline meetings. Users can learn new words as they read, watch videos, participate in meetings, and engage with various content. The platform also features a community, quizzes, and a smart English dictionary with over 200,000 words and meanings. Nischi aims to make vocabulary improvement convenient and effective for both students and working professionals.