Fluent

Fluent (fluent.im) was a browser extension designed to integrate language learning passively into everyday web browsing. It replaced words in English text on websites with vocabulary in a target language such as Spanish, French, Italian, German, or Portuguese, allowing users to build vocabulary without setting aside dedicated study time. The extension also offered quizzes, spaced repetition sessions, daily streaks, and pronunciation guides to reinforce learning. The project has since been discontinued by its creator.