Penguen: Vocabulary Flashcards

Content rating
Teen
10+
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Content rating
Teen
Diverse Content: Discretion Advised
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About this app

Master vocabulary in 26+ languages. Completely free, forever. No subscription. No ads. No paywalls. Ever.

penguen.io uses science-backed spaced repetition to show every word exactly when you are about to forget it - so words stick permanently.

WHY PENGUEN.IO?
While other vocabulary apps charge monthly fees or hide features behind paywalls, penguen.io gives you everything free. That is not a trial. That is how it works.

★ KEY FEATURES
• Spaced Repetition Flashcards - reviews scheduled at the perfect moment
• Multiple Choice - instant-feedback quizzes
• Fill the Letters - master spelling letter by letter
• Match the Pairs - connect words to meanings in a fast game
• Dictation - hear the word, write it down
• Listen and Choose - train your ear with real audio

★ EXAM COLLECTIONS
• IELTS: Academic and General word lists, Band 6-8
• TOEFL iBT: High-frequency academic vocabulary
• Cambridge FCE / CAE / CPE: Level word sets
• PTE Academic: Pearson test vocabulary
• Duolingo English Test: DET high-frequency words

★ STUDY IN YOUR LANGUAGE
26+ interface languages. Learn English from Turkish, Spanish from Japanese, or any language pair - naturally.

★ 644+ CURATED COLLECTIONS
A1 Beginner to C1 Advanced. Business English, Academic English, Travel vocabulary, daily conversations. Build your own and share with the community.

★ TRACK YOUR PROGRESS
• Daily learning heatmap - see your consistency at a glance
• Streak tracking - stay motivated every day
• Accuracy stats per collection - know which words need more work
• Global leaderboard - compete and climb weekly rankings

★ WHO IT IS FOR
• ESL learners building vocabulary from their native language
• Students preparing for IELTS, TOEFL, Cambridge, PTE, or DET
• Professionals expanding business or academic vocabulary
• Anyone who tried Anki and wanted something cleaner and free
• Anyone who hit the Quizlet paywall - penguen.io is free forever

Join 50,000+ learners every day. Completely free. No catch.
Updated on
Jun 9, 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.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info
Data is encrypted in transit
You can request that data be deleted

What’s new

Bug fixes and improvements:
- Fixed various UI issues
- Resolved dark mode display problems