Bonjour
Hello
Ebullient
/ɪˈbʌliənt/
Free English Vocabulary Builder with AI Flashcards
The free vocabulary builder for ESL learners. Study English vocabulary lists with AI flashcards, master new words daily, and track your progress in Spanish, Turkish, French, German, and more.
"I passed my IELTS after 6 weeks of daily practice. The spaced repetition system is genuinely different from anything else I've tried."
"Finally an app that doesn't feel like a game. 200 new words in a month and they actually stayed. My vocabulary scores went up 40%."
"I tried Duolingo, Anki, everything. This is the only one where I actually remember words weeks later. The penguin is adorable too!"
"Bu uygulamayı kullanmaya başladığımdan beri İngilizce kelime dağarcığım inanılmaz gelişti. Günde 10 dakika yeter!"
"Simplesmente o melhor app de vocabulário que já usei. As revisões espaçadas realmente funcionam e não me esqueço das palavras."
"Been using it for 3 months and I can feel the difference in my reading comprehension. The flashcard system is incredibly well designed."
"Aprendí 500 palabras en inglés en solo 3 semanas. El sistema de repetición espaciada funciona de verdad. Totalmente recomendado."
"本当に効果的なアプリです。毎日10分で英単語が自然に身につきます。スペースドリピティションが完璧に機能しています。"
"Этот метод действительно работает. За месяц выучила 300 новых слов и они остались в памяти. Лучшее приложение для словарного запаса."
"Niesamowita aplikacja. Mój angielski poprawił się znacząco po 4 tygodniach. Polecam każdemu kto chce naprawdę zapamiętać słówka."
"Ho imparato 400 parole in un mese. Il sistema di ripetizione spaziata è incredibilmente efficace. Non riesco a smettere di usarla."
"Amazing results after just 2 weeks. I study for the Cambridge exam and this is by far the most effective vocabulary tool I have found."
"The best vocabulary app I've used. I learn 20 new words daily and actually retain them. My GRE prep has improved dramatically."
"Incredible for TOEFL prep. The spaced intervals mean I never forget a word. Scored 110 on TOEFL after 2 months of daily practice."
"Works perfectly for self-study. The algorithm knows exactly when to show you a word again. I've recommended it to all my colleagues."
"Excellent pour apprendre le vocabulaire en anglais. Je progresse chaque jour et les mots restent vraiment en mémoire longtemps."
"Helped me pass my English proficiency exam with a top score. The penguin mascot keeps me motivated and the science really works."
"Wunderbar! Mein Wortschatz hat sich in 6 Wochen verdoppelt. Das Lernsystem ist wissenschaftlich fundiert und macht sogar Spaß."
"Best decision I made for my language learning journey. After 30 days I can read English articles with no dictionary. Outstanding app."
"Perfect for busy professionals. 10 minutes a day on my commute and I've learned 600 words in 6 weeks. Highly recommend."
"I passed my IELTS after 6 weeks of daily practice. The spaced repetition system is genuinely different from anything else I've tried."
"Finally an app that doesn't feel like a game. 200 new words in a month and they actually stayed. My vocabulary scores went up 40%."
"I tried Duolingo, Anki, everything. This is the only one where I actually remember words weeks later. The penguin is adorable too!"
"Bu uygulamayı kullanmaya başladığımdan beri İngilizce kelime dağarcığım inanılmaz gelişti. Günde 10 dakika yeter!"
"Simplesmente o melhor app de vocabulário que já usei. As revisões espaçadas realmente funcionam e não me esqueço das palavras."
"Been using it for 3 months and I can feel the difference in my reading comprehension. The flashcard system is incredibly well designed."
"Aprendí 500 palabras en inglés en solo 3 semanas. El sistema de repetición espaciada funciona de verdad. Totalmente recomendado."
"本当に効果的なアプリです。毎日10分で英単語が自然に身につきます。スペースドリピティションが完璧に機能しています。"
"Этот метод действительно работает. За месяц выучила 300 новых слов и они остались в памяти. Лучшее приложение для словарного запаса."
"Niesamowita aplikacja. Mój angielski poprawił się znacząco po 4 tygodniach. Polecam każdemu kto chce naprawdę zapamiętać słówka."
"Ho imparato 400 parole in un mese. Il sistema di ripetizione spaziata è incredibilmente efficace. Non riesco a smettere di usarla."
"Amazing results after just 2 weeks. I study for the Cambridge exam and this is by far the most effective vocabulary tool I have found."
"The best vocabulary app I've used. I learn 20 new words daily and actually retain them. My GRE prep has improved dramatically."
"Incredible for TOEFL prep. The spaced intervals mean I never forget a word. Scored 110 on TOEFL after 2 months of daily practice."
"Works perfectly for self-study. The algorithm knows exactly when to show you a word again. I've recommended it to all my colleagues."
"Excellent pour apprendre le vocabulaire en anglais. Je progresse chaque jour et les mots restent vraiment en mémoire longtemps."
"Helped me pass my English proficiency exam with a top score. The penguin mascot keeps me motivated and the science really works."
"Wunderbar! Mein Wortschatz hat sich in 6 Wochen verdoppelt. Das Lernsystem ist wissenschaftlich fundiert und macht sogar Spaß."
"Best decision I made for my language learning journey. After 30 days I can read English articles with no dictionary. Outstanding app."
"Perfect for busy professionals. 10 minutes a day on my commute and I've learned 600 words in 6 weeks. Highly recommend."
"Perfect for busy professionals. 10 minutes a day on my commute and I've learned 600 words in 6 weeks. Highly recommend."
"Best decision I made for my language learning journey. After 30 days I can read English articles with no dictionary. Outstanding app."
"Wunderbar! Mein Wortschatz hat sich in 6 Wochen verdoppelt. Das Lernsystem ist wissenschaftlich fundiert und macht sogar Spaß."
"Helped me pass my English proficiency exam with a top score. The penguin mascot keeps me motivated and the science really works."
"Excellent pour apprendre le vocabulaire en anglais. Je progresse chaque jour et les mots restent vraiment en mémoire longtemps."
"Works perfectly for self-study. The algorithm knows exactly when to show you a word again. I've recommended it to all my colleagues."
"Incredible for TOEFL prep. The spaced intervals mean I never forget a word. Scored 110 on TOEFL after 2 months of daily practice."
"The best vocabulary app I've used. I learn 20 new words daily and actually retain them. My GRE prep has improved dramatically."
"Amazing results after just 2 weeks. I study for the Cambridge exam and this is by far the most effective vocabulary tool I have found."
"Ho imparato 400 parole in un mese. Il sistema di ripetizione spaziata è incredibilmente efficace. Non riesco a smettere di usarla."
"Niesamowita aplikacja. Mój angielski poprawił się znacząco po 4 tygodniach. Polecam każdemu kto chce naprawdę zapamiętać słówka."
"Этот метод действительно работает. За месяц выучила 300 новых слов и они остались в памяти. Лучшее приложение для словарного запаса."
"本当に効果的なアプリです。毎日10分で英単語が自然に身につきます。スペースドリピティションが完璧に機能しています。"
"Aprendí 500 palabras en inglés en solo 3 semanas. El sistema de repetición espaciada funciona de verdad. Totalmente recomendado."
"Been using it for 3 months and I can feel the difference in my reading comprehension. The flashcard system is incredibly well designed."
"Simplesmente o melhor app de vocabulário que já usei. As revisões espaçadas realmente funcionam e não me esqueço das palavras."
"Bu uygulamayı kullanmaya başladığımdan beri İngilizce kelime dağarcığım inanılmaz gelişti. Günde 10 dakika yeter!"
"I tried Duolingo, Anki, everything. This is the only one where I actually remember words weeks later. The penguin is adorable too!"
"Finally an app that doesn't feel like a game. 200 new words in a month and they actually stayed. My vocabulary scores went up 40%."
"I passed my IELTS after 6 weeks of daily practice. The spaced repetition system is genuinely different from anything else I've tried."
"Perfect for busy professionals. 10 minutes a day on my commute and I've learned 600 words in 6 weeks. Highly recommend."
"Best decision I made for my language learning journey. After 30 days I can read English articles with no dictionary. Outstanding app."
"Wunderbar! Mein Wortschatz hat sich in 6 Wochen verdoppelt. Das Lernsystem ist wissenschaftlich fundiert und macht sogar Spaß."
"Helped me pass my English proficiency exam with a top score. The penguin mascot keeps me motivated and the science really works."
"Excellent pour apprendre le vocabulaire en anglais. Je progresse chaque jour et les mots restent vraiment en mémoire longtemps."
"Works perfectly for self-study. The algorithm knows exactly when to show you a word again. I've recommended it to all my colleagues."
"Incredible for TOEFL prep. The spaced intervals mean I never forget a word. Scored 110 on TOEFL after 2 months of daily practice."
"The best vocabulary app I've used. I learn 20 new words daily and actually retain them. My GRE prep has improved dramatically."
"Amazing results after just 2 weeks. I study for the Cambridge exam and this is by far the most effective vocabulary tool I have found."
"Ho imparato 400 parole in un mese. Il sistema di ripetizione spaziata è incredibilmente efficace. Non riesco a smettere di usarla."
"Niesamowita aplikacja. Mój angielski poprawił się znacząco po 4 tygodniach. Polecam każdemu kto chce naprawdę zapamiętać słówka."
"Этот метод действительно работает. За месяц выучила 300 новых слов и они остались в памяти. Лучшее приложение для словарного запаса."
"本当に効果的なアプリです。毎日10分で英単語が自然に身につきます。スペースドリピティションが完璧に機能しています。"
"Aprendí 500 palabras en inglés en solo 3 semanas. El sistema de repetición espaciada funciona de verdad. Totalmente recomendado."
"Been using it for 3 months and I can feel the difference in my reading comprehension. The flashcard system is incredibly well designed."
"Simplesmente o melhor app de vocabulário que já usei. As revisões espaçadas realmente funcionam e não me esqueço das palavras."
"Bu uygulamayı kullanmaya başladığımdan beri İngilizce kelime dağarcığım inanılmaz gelişti. Günde 10 dakika yeter!"
"I tried Duolingo, Anki, everything. This is the only one where I actually remember words weeks later. The penguin is adorable too!"
"Finally an app that doesn't feel like a game. 200 new words in a month and they actually stayed. My vocabulary scores went up 40%."
"I passed my IELTS after 6 weeks of daily practice. The spaced repetition system is genuinely different from anything else I've tried."
Learn English Vocabulary with Definition Matching
Strengthen your mental lexicon by connecting words to their meanings in real-time. Our system presents definitions that challenge you to think beyond simple translations, helping you build deep semantic connections between your native language and English.
- Real-world context
- Instant feedback
- Active recall enhancement
Build Vocabulary with Smart Word Associations
Master complex relationships between terms by building cognitive bridges. This interactive pairing mode helps you recognise patterns in vocabulary usage and grouping, ensuring words stick in your memory through logical association rather than rote memorisation.
- Cognitive pattern recognition
- Timed challenges
- Visual mapping
Master English Spelling with Interactive Flashcards
Master English orthography through interactive letter-mapping. By manually completing word structures, you reinforce the visual memory of spelling patterns, eliminating common phonetic mistakes and building confidence in written communication.
- Letter-by-letter recall
- Visual word structure
- Spelling accuracy tracking
Improve Your English Vocabulary Through Listening
Develop native-like listening comprehension by pairing sound with text. Practice recognising words in real-time as they are spoken, strengthening the neural pathways between auditory signals and their linguistic meanings.
- Phonetic recognition
- Adjustable speed (Slow mode)
- Seamless audio integration
Track Your Vocabulary Builder Progress
Visualise your language journey with detailed insights into your daily habits, achievements, and performance levels.
Learning Activity
Practice consistency over the past months
AI-Powered Solution
Smart algorithms that adapt to your personal learning pace and identify your weak spots.
5+ Languages
From Spanish to Italian, learn from the comfort of your own primary language.
30k+ Flashcards
Comprehensive library of visual and text-based cards covering every topic imaginable.
Rapid Memorisation
Proven spaced repetition systems (SRS) designed to move words to long-term memory.
Community Competition
Join global leaderboards and challenge friends to keep your motivation high.
Daily Streaks
Gamified consistency trackers that help you build a lifelong habit of learning.
Sample English Vocabulary List
Preview words from our most popular vocabulary lists. Start learning these English words for free with interactive flashcards.
Browse All Vocabulary Lists
30,000+ words across hundreds of vocabulary lists What Is a Vocabulary Builder?
A vocabulary builder is a tool designed to help you learn and retain new English words systematically. Unlike traditional study methods, our free vocabulary builder uses AI-powered flashcards and spaced repetition to present words at the optimal moment for memorisation. Whether you are an ESL student, preparing for IELTS, or simply expanding your English vocabulary, flashcards are the most effective way to build lasting knowledge. Browse our curated vocabulary lists, practice daily, and watch your English improve.
Learn More About Our MethodHow Our Free Vocabulary Builder Works
Learning English vocabulary is simpler than you think. Just follow these three easy steps.
1. Choose Language
Select your native language and the language you want to learn.
2. Pick a Collection
Browse curated lists of vocabulary suited to your skill level.
3. Practice Daily
Spend 15 minutes a day with our smart flashcards to retain words forever.
Explore Vocabulary Builder Features
Everything you need to learn English vocabulary — completely free, forever.
| Features | Free Forever |
|---|---|
| 40+ Native Languages Learn vocabulary with translations in your own language | check_circle |
| 6 Practice Modes Flashcards, multiple choice, dictation, fill letters, listening and matching | check_circle |
| AI-Powered Collections NEW Generate word collections on any topic using AI | check_circle |
| Community Collections Browse and study collections shared by other learners | check_circle |
| Detailed Progress Analytics Track your learning streaks, accuracy and word mastery over time | check_circle |
| Spaced Repetition Engine Smart scheduling that focuses on words you struggle with most | check_circle |
| Advanced Listening Exercises Improve pronunciation and comprehension with native audio | check_circle |
| Leaderboard & Achievements Compete with other learners and earn badges as you progress | check_circle |
| Offline Mode & Download Download collections and practice anywhere without internet | check_circle |
Vocabulary Builder FAQ
What is penguen.io and how does it work as a vocabulary builder?
Is penguen.io a free vocabulary builder?
How do flashcards help you learn English vocabulary?
What languages are supported?
What practice modes are available?
How are collections organised?
Can I track my progress?
Is there a leaderboard?
How do I create an account?
How do I reset my password?
Ready to build your vocabulary?
Join thousands of learners using our free vocabulary builder to master English every day.