DuoCards - Vocabulary Builder

Contains adsIn-app purchases
4.6
49.4K reviews
1M+
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!

🔹 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.

🔹 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.

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

🔹 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.

🔹 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.

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

✔️ Free language learning apps for English, Spanish, French, German, Russian, Italian, and more
✔️ Learn a language with flashcards, games, and AI-powered vocabulary games
✔️ Bilingual support, educational content, vocabulary building apps, and promo offers
✔️ 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
Jul 25, 2025

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

4.6
47.8K reviews
Kevin Shaffer
November 23, 2025
My main complaint now is that I cannot include the gender alongside the noun without losing the extra context the app provides. *Also it's very strange that the groups of cards you can use to pick from always seem to be in sorted order, and you have to either pick or discard, so you can only learn in alphabetical order? Gender support is lacking. Also, the translations are horrible, I have to use Reverso first before I can trust a translation.
60 people found this review helpful
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DuoCards
November 25, 2025
Hello, not sure what you mean by "losing the extra context the app provides". Adding genders is possible. If you would like any help, please contact us through the Help Center in the app.
Eli G
November 17, 2025
The app has a great concept, except when it falls apart. I love that after adding a word, it suggests a sentence to add onto the flashcard to learn. What makes no sense it why it blocks me from adding flashcards unless I pay for the subscription. This app is supposed to help me learn, not limit my learning. Downloaded Anki and it's 1000X better and you don't get stuck behind a paywall.
4 people found this review helpful
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DuoCards
November 24, 2025
There’s a limit of 20 added cards in the free version. That means it’s time to switch to learning mode and review your words - this helps you keep moving forward and make real progress. Once you’ve learned a few words and your total drops below 20, you’ll be able to add new ones again. If you’re using the paid version, there’s no limit at all.
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.
13 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 support@duocards.com. 🦣

What’s new

Smarter learning algorithm that helps you learn more effectively.
Enhanced AI that provides better grammar explanations, personalized stories, and more accurately responds.
New study sets with new vocabulary focused on learning popular topics.
Optimized notifications system to help maintain your daily streak.
Performance upgrades and bug fixes for smoother studying.