DuoCards - Vocabulary Builder

Contains adsIn-app purchases
59.1K reviews
Content rating
Everyone
50L+
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!
Learn English words and improve vocabulary using flashcards, videos & articles
Updated on
31 Aug 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

56.9K reviews
Lore
13 June 2021
Great flash card app I really like how they work and how easy it is to add cards. However, the free card limit made me immediately Uninstaller and look into a different app. I just want to have my flash cards on the go, and I dont have enough money for chicken nuggets so I absolutely will not be paying for this. It would be one thing if it was a one time flat rate but im not doing a subscription service.
49 people found this review helpful
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DuoCards
14 June 2021
Sorry to hear that. You could go with the cheaper 3 months, during which you will add and learn as many cards you want - those cards will stay in the app so you will be still reviewing them even after premium won't be active and you can re-think in the future if you will be already good with the limit (20 cards a day) or you will purchase again.
Sarah Dickson
23 October 2022
Honestly, this is the best flashcard app I've found for Bengali. It has been hard to learn Bengali because there is not a lot of resources available but this app has a simple interface, some readily available material, and it's easy for me to create my own study material from online articles and videos. I also think the algorithm works well for me. It keeps me motivated to see my list of "known" words growing steadily while still reminding me about some of the older words so I don't forget them.
1 person found this review helpful
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Allison Ducker
6 November 2022
I used this for Estonian. Maybe if you use this for a more popular language you'd be happier. The translations were clearly done by machine. Many are wrong or in random cases that aren't nominative (e.g. 'market' is given as 'turul' in the addessive case (at the market) instead of turu the nominative.) The pictures are nice for creating your own, but the limit for free accounts is so few I'd rather use another app. The video translation to cards is a nice future but bad translations.
13 people found this review helpful
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What's new

Learn more wherever you are with reliable offline study and syncing. Create personalised card sets with AI, get detailed pronunciation feedback, and practise with richer roleplays and comprehension exercises. We also added language-level progress, mobile deck export, and easier set search—plus many fixes and performance improvements.