DuoCards - Vocabulary Builder

Contains adsIn-app purchases
4.5
50.1K reviews
1M+
Downloads
Content rating
Everyone
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About this app

DuoCard is an app that will help you to learn a new language or improve vocabulary for the ones that you already know. Learn languages with flashcards and video language courses. Use our vocabulary AI builder to find new words!

Learn English, Spanish, French, German, Russian or other languages quickly with our app for learning languages free. These simple language online courses will improve your vocabulary quickly and seamlessly. This is a powerful AI language learning app designed to help you learn a language effectively. In DuoCards you will learn languages with videos and by using flashcards - Learn English, Spanish, French, Italian, Portuguese, German, Korean, Japanese, Russian, Italian, etc.

⭐Language Flashcards Learning Method with Space Repetition
This modern language learning app uses flashcards to view foreign words, phrases or sentences to the learner. Once you have picked a language you want to learn, you will swipe and sort the cards as known or unknown. Space repetition algorithm will then take care of when you should repeat the words to properly memorize the vocabulary.

⭐Guess Words and Phrases to sharpen skills
In learning mode you will tap on the language flashcards to turn it on your native language side and you swipe right the flash cards if you guessed it correctly. Learn English words (or other language) meanings or basic words in your native language and swipe left on the words that you do not know.

⭐Integrated translator
Thanks to Integrated Translator most of the foreign languages are ready to use. You can pick by your desire and learn English, Spanish, French, Portuguese, German, Italian, Russian, Korean, Japanese, or any other from 50+ foreign languages.

⭐Vocabulary Builder and Performance tracker
Save the new words in your English vocabulary decks and see the progress on the dashboard. See which words you know, words you want to learn, and completely learned words with just a glimpse!

⭐Video Language Courses
You can watch any public video from YouTube with subtitles and learn from it. By clicking on unknown words you will pause the video and display the translations.

⭐Read Foreign Language Articles
You can also read articles in a foreign language to learn a new language or learn new English words. If you want to learn Spanish, learn English, or other languages, it is a perfect tool for daily practice. With our free language learning apps features, you can focus on learning English, improving your vocabulary, and mastering new phrases every day.

⏩Features of DuoCards – Language Learning with Flashcards & Videos:
✔️ Simple and easy foreign language learning app for free
✔️ Language flashcards learning technique for quick retention of information
✔️ Tap on any flashcard to see the English flashcard and learn the meaning
✔️ Learn languages free from a collection of world languages in your free time
✔️ Use vocabulary builder to find new words, phrases and sentences in other languages
✔️ Learn English words from your native language or learn a new language easily
✔️ Easy swiping and tapping controls to move the language flashcards
✔️ Save the phrases, words, and sentences you want to learn in other languages
✔️ Enter guess mode to evaluate your language learning free skills
✔️ Use the integrated translator to learn languages free and save new words
✔️ Add words from shared sets or read foreign language articles
✔️ Share words you don’t know with Duo Cards and learn their meaning

Learn a new language by using a powerful language learning app. The new learn languages free app is here to help you. If you want to learn languages, improve your English learning skills, or find free language learning apps, it is your best solution. Start to learn English free with the best learning English app. Download DuoCards – Language Learning Flashcards today! Learn a new language fast and easily with our video language courses. Vocabulary builder - Memorize it easily and improve your vocabulary!
Updated on
21 Jan 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
48.5K reviews
Kevin Shaffer
23 November 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.
64 people found this review helpful
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DuoCards
25 November 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.
Aryel L.
25 November 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.
35 people found this review helpful
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DuoCards
25 November 2025
Thank you for your honest feedback. If you have any other suggestions, feel free to share them with us at support@duocards.com. 🦣
James Christensen
1 May 2024
I like it! The ability to share words to the app to add them to the deck is very convenient and the time between words feels a little better for me than other flash card apps. The use of AI means you sometimes need to make corrections, even in the pre-made decks. Minor issues: 1. Touch sensitivity seems off during matching quizzes, and you have to double-check if it registered. 2. Sometimes a card comes up and is replaced by another card, and it's confusing to know which word I'm answering.
33 people found this review helpful
Did you find this helpful?
DuoCards
2 May 2024
Thanks for the positivity. We are aware of this issue. Thank you for reporting it. The developers are looking into it and it should be fixed soon. Keep conquering those language goals!💪 Simona 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