Relingo is a subscription-based educational tool designed for language learners, available on the Firefox platform. This innovative program allows users to read articles and watch videos while gradually mastering vocabulary from any webpage. It automatically highlights and translates unfamiliar words based on the user's difficulty settings, enabling a seamless learning experience without disrupting the browsing flow. Users can engage with content from popular sites like BBC, Medium, and YouTube, making it an accessible resource for language acquisition.

The application also features a personal vocabulary notebook, where users can accumulate and review new words daily. By integrating word learning into regular web activities, Relingo aims to enhance retention and understanding. It supports multiple languages, including Chinese, Korean, and Spanish, catering to a diverse audience. Overall, Relingo provides an effective way to expand vocabulary in an enjoyable and engaging manner.