About DuoCards - Vocabulary Builder
Build vocabulary and learn languages with DuoCards, a flexible vocabulary builder for English and 50+ languages. Save new words from videos, articles, subtitles, courses, then practice with AI flashcards, speaking...
Build vocabulary and learn languages with DuoCards, a flexible vocabulary builder for English and 50+ languages. Save new words from videos, articles, subtitles, courses, then practice with AI flashcards, speaking exercises, listening practice, and spaced repetition so the words stay in memory.
DuoCards is built for learners who want more than generic language lessons. You can discover useful words in real content, save them into a personal vocabulary deck, and review them with smart language flashcards that adapt to your progress.
What you can do with DuoCards:
- Build English vocabulary with flashcards that repeat at the right time
- Learn words from videos, subtitles, articles, courses, and shared decks
- Practice conversations with an AI language tutor for daily situations
- Improve pronunciation with speaking and listening exercises
- Save phrases, example sentences, and translations in one vocabulary app
- Study Spanish, French, German, Japanese, Korean, Italian, Portuguese, Russian, and more
- Create private decks or learn from public vocabulary sets made by other learners
- Use offline learning when you want to review without a stable connection
Learn from videos and articles
Language learning works better when words appear in context. DuoCards lets you save vocabulary from videos with subtitles and from foreign language articles, so you can connect each word with a real sentence, topic, and memory. Tap a word, check the translation, save it to your deck, and review it later.
Practice with AI flashcards
DuoCards combines classic flashcards with AI practice. Review words, listen to pronunciation, speak your answers, ask for examples, and practice short conversations. Use the AI tutor to understand grammar, see words in context, and turn your saved vocabulary into useful phrases.
A vocabulary builder for many goals
Use DuoCards as an English vocabulary app, a Spanish flashcards app, a language flashcards app, or a daily vocabulary builder for school, travel, work, exams, and everyday conversations. You can learn beginner words, advanced phrases, useful verbs, pronunciation, listening, and sentence patterns.
How DuoCards works:
1. Choose the language you want to learn.
2. Find useful words in videos, articles, courses, decks, or your own notes.
3. Save words and phrases to your personal vocabulary deck.
4. Practice with flashcards, AI conversations, pronunciation, and listening.
5. Review with spaced repetition until the words become familiar.
Why learners use DuoCards:
- Real content: learn from videos, articles, and examples instead of isolated word lists
- Smart review: spaced repetition helps you remember vocabulary for longer
- AI practice: turn saved words into conversations, stories, and grammar examples
- Flexible decks: create your own word lists or study public language sets
- Many languages: learn English and 50+ languages from one app
- Clear progress: see which words are new, known, or ready to review
- Offline review: keep practicing vocabulary while traveling or commuting
DuoCards is useful if you are learning English, improving Spanish vocabulary, studying French words, reviewing German phrases, practicing Japanese or Korean, or building a personal word bank in another language. It works for beginners who need simple vocabulary and for advanced learners who want to remember words from real content.
Use DuoCards for:
- English vocabulary and pronunciation practice
- Spanish, French, German, Italian, Portuguese, Russian, Japanese, and Korean words
- Language flashcards with spaced repetition
- AI tutor practice for speaking and grammar
- Video lessons, subtitles, and article-based learning
- Personal word lists, shared decks, and ready-made courses
- Daily review sessions for school, travel, work, or conversation
Download DuoCards and build vocabulary from real content. Learn languages with AI flashcards, video lessons, articles, speaking practice, listening exercises every day.
Previous Versions
Here you can find the changelog of DuoCards - Vocabulary Builder since it was posted on our website on 2021-12-10 14:16:40.
The latest version is 1.20.15 and it was updated on 2026-06-22 23:26:56. See below the changes in each version.
DuoCards - Vocabulary Builder version 1.20.15
Updated At: 2026-01-21
Changes: 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
DuoCards - Vocabulary Builder version 1.20.8
Updated At: 2026-01-21
Changes: 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.
DuoCards - Vocabulary Builder version 1.19.16
Updated At: 2025-03-03
Changes: Example of usages for words in most of the languages thanks to AI
New language courses for English, Italian, Spanish and other languages
New feature for selecting sentences
Fixes AI-assistant and improved prompting
Improve onboarding process
DuoCards - Vocabulary Builder version 1.19.2
Updated At: 2024-03-19
Changes: Introduction of freezes for daily series to prevent accidental gaps in your daily series
Major update to language courses - more flashcards and more engaging phrases
Improved AI grammar generation for all commonly used vocabulary
Introduced monthly subscriptions
Improve your foreign languages with updated flashcard sets, developed by language specialists.
DuoCards - Vocabulary Builder version 1.18.1
Updated At: 2023-10-20
Changes: Improved language flashcards experience by optimizing animations.
New language courses in English, German, Spanish, French, Korean and more…
Enhanced grammar explanations for your better understanding of frequently used words and phrases.
Improved review process of public flashcard sets.
Library sorting by your language level.
Updated Login flow with Google, Apple or in case of wrong credentials.
DuoCards - Vocabulary Builder version 1.17.0
Updated At: 2023-02-01
Changes: Ability to learn vocabulary from definitions instead of translations for English, Spanish and French using Oxford Dictionary
Family subscription for up to 6 members
New powerful filtering feature with possibility to include already learned vocabulary
New intermediate courses in English, Spanish, French, Korean, and more
New section of recommended language sources under articles, videos or flashcards
Improved loading speed for smoother studying
DuoCards - Vocabulary Builder version 1.13.0
Updated At: 2022-04-15
Changes: Better stability of the app
Spaced repetition artificial intelligence for optimal learning
Added more in depth statistics
Daily streak tracking and notifications
New login/registration process
New daily quests
Introducing a mammoth pet to help with learning
Settings redesigned for new users
DuoCards - Vocabulary Builder version 1.11.0
Updated At: 2022-03-21
Changes: Spaced repetition artificial intelligence for optimal learning
Added more in depth statistics
Daily streak tracking and notifications
New login/registration process
New daily quests
Introducing a mammoth pet to help with learning
Settings redesigned for new users
DuoCards - Vocabulary Builder version 1.10.2
Updated At: 2021-12-06
Changes: Login with Google
Improved translations in Language courses
Improved adding videos with subtitles
Redesigned tutorial for new users
New tooltips in Language learning mode
