penguen.io: Vocabulary Cards

Master vocabulary in 26+ languages — completely free.
No subscriptions. No ads. No paywalls. Ever.
penguen.io is the smarter way to build lasting vocabulary using science-backed spaced repetition.

WHY PENGUEN.IO?

While other flashcard apps charge $35 or hide their best features behind subscriptions, penguen.io gives you everything for free. That's not a trial. That's just how it works.

6 WAYS TO LEARN

Flashcards — classic spaced repetition that schedules reviews exactly when you're about to forget
Multiple Choice — test your knowledge with instant-feedback quizzes
Fill the Letters — master spelling by reconstructing words letter by letter
Match the Pairs — connect words to meanings in a fast-paced pairing game
Dictation — hear the word, write it down, build listening and writing at once
Listen & Choose — train your ear to recognize words in natural audio

STUDY IN YOUR LANGUAGE

penguen.io supports 26+ languages. Whether you're learning English from Turkish, Spanish from Japanese, or French from Arabic — select your native language and study vocabulary the way your brain naturally processes it. No awkward English-only interfaces.

READY FOR YOUR EXAM

Dedicated vocabulary collections for IELTS, TOEFL, PTE, Cambridge, and the Duolingo English Test. Built by language specialists, organized by topic and difficulty level. Stop guessing what to study.

644+ CURATED COLLECTIONS

Browse collections built for every level — A1 Beginner through C1 Advanced. Business English, Academic English, Travel vocabulary, everyday conversations, and more. Or build your own collection and share it with the community.

TRACK YOUR PROGRESS

Daily learning heatmap shows your study consistency at a glance. Streak tracking keeps you motivated. Detailed accuracy stats for every collection so you know exactly which words need more work.

COMPETE AND CLIMB

Join the global leaderboard. Weekly and all-time rankings let you see where you stand against learners worldwide. Friendly competition is one of the most effective motivators for daily practice.

STUDY ANYWHERE

Full offline support — download your collections and study on the plane, underground, or anywhere without signal. Dark mode included for late-night sessions.

Download penguen.io and start building vocabulary that actually sticks. Free today. Free always.