You Don't Know Javascript is a trivia game available on Android that allows users to experience the classic quiz game, You Don't Know Jack. This fan-made recreation focuses on the European versions of the game, as the American edition remains commercially available. Players can engage in trivia challenges in three languages: French, British English, and German. The app supports 1 to 3 players, making it suitable for small gatherings or solo play.

Currently, the app does not support online multiplayer on mobile devices, but players can enjoy the game on PC and Mac. The interface is designed to mimic the original quiz format, delivering a nostalgic experience for fans of the series. Overall, You Don't Know Javascript offers a fun way to engage with trivia in a familiar format, albeit with limited multiplayer capabilities on mobile.