Kioku: Spaced Flashcards

A scientific algorithm adapts your review schedule to your memory — automatically. Start today.

Spaced is a flashcard app that uses spaced repetition to help you memorize words, phrases, and knowledge efficiently for the long term.

KEY FEATURES

◆ FSRS Algorithm The world-leading memory model "FSRS" analyzes your retention in real time and suggests reviews only when you're about to forget — maximizing results in minimum time.

◆ Auto Dictionary Lookup (Multilingual) Just type a word and tap the dictionary button — pronunciation, meanings, and examples are filled in automatically. Displayed in your device language: Japanese, Korean, Chinese, Spanish, French, German, Portuguese, or English.

◆ Text-to-Speech Tap any word or example sentence to hear native pronunciation. Build your listening skills at the same time.

◆ Organize with Decks Create decks by topic — English vocab, certifications, technical terms — and focus on exactly what you want to study.

◆ Simple to Use Front side for the question, back for the answer. Flip the card and rate yourself: Again / Hard / Good / Easy. Your rating determines when you'll see the card next.

◆ Track Your Progress Monitor retention rate, review count, and study streak on your dashboard. See your daily progress at a glance.

◆ Passwordless Login Sign in securely with just your email and a one-time code. Cards sync automatically across all your devices.

WHO IT'S FOR • English learners and exam preppers (TOEIC, EIKEN, etc.) • Students studying for medical, legal, or IT certifications • Anyone building vocabulary in a foreign language • Students preparing for school or cram school exams

PRICING Core features are free to use.