DuoCards - Vocabulary Builder

Contains adsIn-app purchases
4.6
47.9K reviews
1M+
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
Jul 25, 2025
Events & offers

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
46.4K reviews
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
Enja Tosch
September 16, 2024
(After two days:) I like it. Has my language (rare), it doesn't restrict free use too much (20 new cards a day) and there are so many options here - so many shows and articles etc that I didn't know of before! A great app to find more resources for your language. With transcripts and help to understand them. I also like that it allows me to add my own cards and that it offers grammar etc tips when struggling with a card. On top of a cute but simple background mascot - definitely a fan so far.
8 people found this review helpful
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AnneSo Lindau
August 14, 2024
Great way to learn vocabulary through different memory channels! (written, oral, pictures and context). As soon as you enter a new word, it automatically creates a flash card for you with all those elements. The best way to memorize new words! Very friendly and nice app design, fun to use! The best part : the AI language assistant that is like a personal teacher. I'm always asking it to show me the different verb forms, the use of different words or expression, etc. I absolutely love it!
3 people found this review helpful
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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.