DuoCards - Vocabulary Builder

Contains adsIn-app purchases
4.6
45.7K reviews
1M+
Downloads
Content rating
PEGI 3
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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
Jun 10, 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
44.2K reviews
Fraser McMillan
March 28, 2025
A great little app that I've used to learn several hundred Spanish words and phrases over the last year. Whenever I come across a word I don't know, I add it to DuoCards, making it an excellent complement to classes and more conventional apps. The UI is simple and has a cute theme/incentive structure. More than worth the subscription 🦣📖
33 people found this review helpful
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DuoCards
April 4, 2025
💙Huge thanks and good luck on your language journey! 🚀
Diana Velasco
March 12, 2025
Learning German & this is my favorite language learning app so far! (absolutely prefer it over the Duo owl, even though I'm still maintaining my 650+ day streak there, this Duo Mammoth is where I see real improvement and practice regularly). It has traditional flash cards, with explanations and lessons. Also offers level appropriate short movies and practice convos. The free version is great (big fan of the cute Memo sunset). Just got the subscription to support the app and enjoy further perks!
36 people found this review helpful
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DuoCards
March 25, 2025
Hi Diana, thanks for the awesome review! 🦣✨This makes us really happy. Team DuoCards
Adam Reis
January 17, 2025
The app offers generally good UX for learning flashcards in a modern way. However it has problems that made it unusable. Biggest problem is that the audio is crackling on the latest android version. Might be Android bug, but devs have shown no interest to attempt a fix despite sending video. Also the loading screen takes ages to load, and worse, loads twice each time you open the app. Frustrating, when you just want to get in to learn. Reluctantly ended my paid sub as no fixes forthcoming.
14 people found this review helpful
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DuoCards
January 17, 2025
Hi Adam! I'm really sorry to hear about your experience, but I want to extend a huge thank you for all the invaluable feedback you've shared with us 🙏 I'm happy to inform you that the sound issue has been resolved recently, and your suggestions are already on our roadmap. I truly hope to see you back soon! 🦣💙 Tina

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.