Vocabuo is a language‑learning app that helps users acquire English, Spanish, German, French, Italian, and Swedish vocabulary through smart flashcards. Users can create custom word collections from any text source such as articles, lyrics, ebooks, or websites, and the app extracts words in their base forms for practice. Learning is driven by a spaced‑repetition system, with flashcards presented by swiping and sentences shown for contextual understanding. The app also provides pronunciation audio for each sentence and offers detailed word explanations.