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About 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.