Vocabulary - VocaStack

Master vocabulary in English, Spanish, German, and French - simultaneously. VocaStack is a multi-language vocabulary builder that teaches you words in four languages at once. Every flashcard shows the word in English with translations in Spanish, German, and French, so you build polyglot skills from day one. WHY VOCASTACK? LEARN 4 LANGUAGES AT ONCE Instead of learning "resilient" in just English, learn "resiliente" (Spanish), "widerstandsfähig" (German), and "résilient" (French) side-by-side. See the connections between language families (Germanic and Romance) as you build vocabulary. SMART SPACED REPETITION Based on the proven SM-2 algorithm, VocaStack shows you words at the perfect moment for maximum retention. Struggle with a word? You'll see it more often. Master it? It fades into long-term review. 100% PRIVATE & OFFLINE All your progress stays on your device. No accounts. No ads. Your learning is yours alone. STAY CONSISTENT - Daily streak counter with protective streak freezes - Achievements for milestones (10, 50, 100, 500, 1000 words) - Progress statistics to track every word you master - Customizable daily goal ADD YOUR OWN WORDS Create custom vocabulary lists for specialized terms, study material, or phrases from your favorite books. Full translation support across all 4 languages. BEAUTIFUL, MODERN DESIGN Smooth animations, minimalist layout, and full dark mode support. FEATURES 4 languages: English, Spanish, German, French Spaced repetition algorithm (SM-2) Multiple-choice quiz mode Flashcards with example sentences Daily streak tracking + streak freezes Custom word lists Achievement system Progress statistics and history Dark mode + light mode Fully offline - works anywhere No ads, no accounts PRIVACY FIRST Your vocabulary data never leaves your device. We don't collect learning analytics, don't use advertising IDs, and don't share data with third parties. BUILT FOR • Language learners building polyglot vocabulary • Students preparing for exams • Travelers picking up multiple languages for a trip • Professionals using business vocabulary across markets • Anyone tired of subscription fatigue in language apps Questions, feedback, or feature requests? Use the in-app Contact Support form or email us directly.