FDJ

FDJ is a vocabulary learning app built on respect, for your privacy, your attention, and your time, delivering a complete flashcard learning experience that is private by design, uninterrupted by ads, and immediately available without account creation or internet access.

Your data in FDJ is yours in the truest sense: stored locally on your device, never uploaded, never analyzed by third parties, and never used to target you with advertising or recommendations. The app's design doesn't depend on your data, so your data stays private.

Your attention in FDJ is protected: no push notifications designed to maximize engagement, no reward mechanics engineered to make the app feel compulsive, no ads that interrupt study sessions at the moments when your concentration is highest.

Your time in FDJ is respected: a daily goal you set yourself, a streak counter that measures consistency without punishment, and study sessions that end when you decide they end, not when an arbitrary timer or paywall tells you to stop.

The combination of privacy, focus, and user control makes FDJ a vocabulary learning app that you can trust completely, one that delivers genuine educational value without hidden costs in attention, data, or money. Just you, the words, and the time you choose to invest.