DuoCards - Vocabulary Builder

Contains adsIn-app purchases
4.5
50.2K reviews
5M+
Downloads
Content rating
Everyone
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About this app

Master vocabulary and learn languages fast with DuoCards – the #1 duocards app for Spanish flash cards, English words, AI-powered vocab builder, and more!

šŸ”¹ DuoCards Language Flashcards
Swipe, sort and study with our spaced-repetition algorithm. Build your vocabulary with duo cards app precision: English vocabulary, Spanish vocabulary, French flashcards, German words, Korean vocab, Japanese kanji, Russian language, Italian vocabulary, Portuguese phrases, and 50+ languages.

šŸ”¹ Vocabulary Builder & AI Tutor
Use our vocabulary AI builder to discover new words, phrases, and sentences. Whether you’re improving English learning, mastering Spanish vocabulary, or expanding your French vocab, this AI tutor adapts to your level. A free vocabulary builder app and vocab builder for learners of all levels.

šŸ”¹ Tinycards & Memorise fun
DuoCards app brings you flashcards fun with extra power: built-in translator, offline mode, and shareable decks.

šŸ”¹ Video Language Courses & Articles
Watch YouTube videos with subtitles, tap unknown words to pause, translate, and save to your duo cards decks. Read foreign language articles to strengthen your bilingual skills and vocabulary building apps routine.

šŸ”¹ Progress Analytics & Performance Tracker
See your learning streaks, known vs unknown words, and dashboard heatmaps. Track your English vocabulary growth, Spanish flash cards mastered, and total words learned.

šŸ”¹ Social & Sharing Features
Collaborate with friends on duocards language decks or share your favorite English learning app resources. Join a community of language learners.

āœ”ļø Free language learning apps for English, Spanish, French, German, Russian, Italian, and more
āœ”ļø Learn a language with flashcards, games, and AI-powered vocabulary games
āœ”ļø Bilingual support, educational content, vocabulary building apps, and promo offers
āœ”ļø No subscription required—learn English, learn Spanish free, learn languages anytime, anywhere

Download DuoCards today and transform your language learning! Improve vocabulary, conquer English words, master Spanish flash cards, and speak like a native—your ultimate language app.
Updated on
Apr 04, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App activity
This app may collect these data types
Personal info, Financial info and 3 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.5
48.5K reviews
Devil's Doorbell
March 25, 2026
This app is simply fantastic šŸ‘šŸ¼ Manually adding vocabulary words from readings and videos is great and there are various exercises to ensure meaningful and effective spaced repetition. I've been using it now for a few weeks and my vocab has grown by leaps and bounds. I'm an intermediate/advanced Spanish learner, but I'm positive I could have put this app to good use from scratch.
1 person found this review helpful
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DuoCards
March 26, 2026
We're glad to hear this! Keep up the good work šŸ¤ž
Kevin Shaffer
April 1, 2026
I wish you would spend less time with annoying floating elephants and fix your atrocious pronunciations.
64 people found this review helpful
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DuoCards
April 3, 2026
Hi Kevin, it was just our little April Fools’ prank, now it’s already gone. :)
Aryel L.
November 25, 2025
This app definitely has potential. I've recommended it to others. But here's why I wouldn't give it five stars (for now): 1) The translations can sometimes be inaccurate. Their AI is not yet on par with, say, chatGPT or Gemini, so I'm finding myself sometimes fixing them with these and importing them here. 2) The listening mode would be awesome if it wasn't so laggy. Sometimes it stops by itself or takes forever to load. It doesn't count as practice either. An offline mode would be a plus.
36 people found this review helpful
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DuoCards
November 25, 2025
Thank you for your honest feedback. If you have any other suggestions, feel free to share them with us at [email protected]. 🦣

What’s new

AI Roleplay - Practice real-world conversations in simulated scenarios
AI Stories - Interactive stories with comprehension exercises
Bookmarks - Save your current progress in an article for later
Transliteration - Read Chinese, Arabic, Japanese scripts easily
Auto Dark Mode - Study comfortably day or night
Smarter Translations - Context-aware translations
AI Grammar Feedback - Accurate corrections with explanations