K Flash is a Korean study app for serious learners: spaced repetition that adapts to your pace, opinionated card design, and no shortcuts. Master the Korean language on iPhone, iPad, and Mac.
BUILD A FOUNDATION IN KOREAN — FREE
A substantial part of K Flash is free to use for as long as you like.
• The complete Hangul deck — learn to read Korean
• Drill the 500 most frequent Korean Vocabulary words
• Pick up essential survival and conversational phrases in our Phrasebook
• Memorize and drill the three beginner Hanja levels (8급, 준7급, 7급)
• Study beginner grammar patterns, with sentence cloze cards
• The complete I Ching deck — dive into the Confucian roots of Korean society
Our spaced-repetition study modes, quiz, and browse mode are all available for each of our six decks. Your streaks, statistics, study history, favorites, and iCloud sync are free for everyone, permanently — including for content you haven't unlocked. Nothing you study or unlock is ever taken away.
SIX DECKS, BUILT FOR SERIOUS KOREAN STUDY
• Hangul — from individual jamo to the rules of syllable blocks
• Phrasebook — everyday Korean phrases with politeness-level callouts
• Vocabulary — thousands of cards verified against the National Institute of Korean Language, with glosses, example sentences, parts of speech, frequency rankings, and corresponding hanja
• Grammar — verb endings, particles, and sentence patterns, each with study examples, and cloze sentences to drill them
• Hanja — the 한국어문회 배정한자 levels with readings, meanings, and compound examples
• I Ching — the sixty-four hexagrams in James Legge's public-domain translations
FOUR WAYS TO LEARN & STUDY
• Browse — read at your own pace, flip cards, mark favorites
• Study — spaced repetition tracking your mastery card by card
• Quiz — diagnostic sets with bronze, silver, and gold tiers
• Quick Study — short cross-deck sessions for daily check-ins or hard grinds
BUILT THOUGHTFULLY
• No ads, no analytics, no tracking — your data is yours alone
• No account required, and no server: everything lives on your own devices
• Optional iCloud Sync — study records, streaks, favorites, and quiz progress carried across iPhone, iPad, and Mac, restorable anytime, never visible to anyone but you
• Export and import anytime; one-tap erase
• Built-in support for Apple's Premium and Enhanced Korean voices, bringing high quality speech synthesis to press-and-hold audio examples
• Customizable study reminders and streak-saver notifications
• Light, dark, and monochrome modes, and a customizable color scheme
UNLOCK THE COMPLETE LIBRARY
Unlocking K Flash grants you access all 20,000+ cards for browse, study, and quiz across all six decks on iPhone, iPad, and Mac.
There are three ways to unlock it:
• Founding Edition — a single one-time purchase, no subscription. Includes every K Flash 1.x update on iPhone, iPad, and Mac. The Founding Edition is offered for a limited period and will be withdrawn from sale when K Flash 2.0 ships; withdrawal does not affect anyone who has already purchased it.
• Annual subscription
• Monthly subscription
Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID settings.
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