Language Den

Language Den is the only vocabulary app built from the ground up for language learners. Not a generic flashcard tool. Not a game. A focused app for one thing: helping you learn and remember vocabulary in any language.

SPACED REPETITION THAT WORKS
Language Den uses FSRS, a modern algorithm that's more accurate than what most apps have used for the past 20 years. It tracks how well you know each word and schedules reviews at the exact moment you're about to forget. You don't configure anything. You just review your cards and the app handles the rest.

ANY LANGUAGE YOU CAN TYPE
Spanish, Japanese, Arabic, Korean, Thai, Swahili, Welsh — it doesn't matter. There's no fixed language list. If your keyboard can produce the characters, Language Den can teach you the words. Learning a less common language? You get the same experience as someone learning Spanish.

BUILT FOR HOW LANGUAGES WORK
Definitions in context. Natural example sentences. Multiple card types so you can learn the same word from different angles. Every feature is designed around how you learn vocabulary, not how you memorize random facts.

QUICK NOTES
Hear a new word while watching a show or reading? Open the app, type it in or record the audio, and close it. Two seconds. Later, process your notes into full flashcards. Every word you encounter becomes a word you can learn.

IMAGES THAT MAKE WORDS STICK
Built-in image search powered by Unsplash. Find a photo that captures the meaning of a word and attach it to your card. Visual anchors help cement words in memory in a way text alone never will.

IMPORT YOUR EXISTING VOCABULARY
Already have Anki decks? Language Den imports .apkg files directly. You can also import from CSV or add words manually. Your existing work comes with you.

YOUR DATA STAYS YOURS
No account to create. Your data syncs through your personal iCloud and never touches anyone else's servers. No ads. No tracking. No analytics.

COMPLETELY FREE
No subscription. No paywall. No "premium" features locked behind a monthly fee. Language Den is free to download and free to use.