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.