DuoCards - Vocabulary Builder

Contains adsIn-app purchases
4.5
50.5K reviews
5M+
Downloads
Content rating
USK: All ages
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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
Jan 21, 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
48.8K reviews
James Turner
February 10, 2026
it is a pretty useful app for sure. love that you can make flashcards of whole sentences and it'll clearly speak them to you. They've got a lot of great courses also. Though I do feel it's a bit steep the premium price, when other apps that are similar to this. It's a one off payment which is usually cheaper than what they want for the year.
4 people found this review helpful
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DuoCards
February 16, 2026
We’re happy you’re enjoying the app!
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. :)
Andreea Rat
June 19, 2024
The concept is good. However, I have chosen the german language, the "hard" deck of cards, and there are no articles for substantives, the verbs are not written in the infinitive form, translations are poor in some cases, and sometimes the example sentences have nothing to do with the word given. As a free app is ok, I wouldn't pay for it, given that it needs improvement. The AI feature is pretty useless.
5 people found this review helpful
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DuoCards
July 16, 2024
Hi, could you let us know which set or course it was at info@duocards.com so we can fix it?🙏 DuoCards is a community application - everyone can create their own set of cards, publish it publicly so that other people can learn from it. You might want to try out our official courses and sets, we believe you will love them! Michaela from DuoCards

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