DuoCards - Vocabulary Builder

Contains adsIn-app purchases
4.3
45.6K 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
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

4.3
44.1K reviews
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!
35 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
Rand Ashley
August 31, 2024
Huge number of cards from and it paces you to move on to new sections once you're comfortable with what you've covered. (Edit): This was previously 5 stars, but some cards have the first sound of a word's audio cutout. I contacted customer service with a video and they gaslit me by saying the video doesn't show what it clearly shows) it's not constant or on all cards so it's manageable but I will keep this at 3 stars until it's fixed.
30 people found this review helpful
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DuoCards
April 19, 2024
Thanks a lot and keep learning! :) Simona from DuoCards
Kevin Shaffer
September 28, 2024
The app has grown on me and has a few improvements. I hope the app can remain less focused on social than Duolingo. My main complaint now is that I cannot include the gender alongside the noun without losing the extra context the app provides. Also, some words are translated by the app correctly, but doesn't include the context to help you better understand the word.
35 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.