Comparison

OLK vs Teacher Moon

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

OLK

Master Korean with a structured, free app designed for beginners. Learn the alphabet, build vocabulary with over 1,300 verbs, and understand grammar through clear explanations and practical examples. Practice reading and test your knowledge with engaging quizzes.

Highlights
  • Learn Hangul (Korean alphabet)
  • 1,300+ Korean verbs with usage hints
  • Clear grammar explanations with examples
  • Guided reading passages
  • Vocabulary flashcards and 'My Words' feature
  • Quizzes for Hangul, verbs, and grammar
  • Audio pronunciations for Korean words
Features
Read full description

Learn Korean with OLK — From Your First Letter to Your First Conversation Your Korean learning journey starts here. Simple, structured, and completely free. Learning Korean doesn't have to feel overwhelming. OLK (Ola Learns Korean) is designed to help you build a strong foundation in Korean, one step at a time. Created by a Korean learner, for Korean learners, OLK brings together everything you need to start learning, practicing, and understanding the language in one easy-to-use app. Whether you're starting from absolute zero or brushing up on what you already know, OLK guides you from Hangul (the Korean alphabet) through essential vocabulary, grammar, reading, and everyday expressions. With content aligned to TOPIK I, Korea's official beginner-level proficiency exam, you'll learn with structure, practice with purpose, and progress at your own pace. START WITH HANGUL — THE KOREAN ALPHABET Learn 19 consonants, 21 vowels, and double letters. Hear audio pronunciations for individual characters. Understand batchim (final consonants), sound linking, and pronunciation rules. Learn how to write Korean characters with stroke-order guidance. BUILD YOUR VOCABULARY 1,300+ Korean Verbs Explore an extensive, beginner-friendly collection of Korean verbs, complete with English meanings, usage hints, and frequency rankings informed by Korean language research. Tap any verb to explore its present, past, future, and progressive forms. Conjugations are hidden until you're ready to reveal them, giving you a chance to test what you've learned. Korean Adjectives Learn how Korean adjectives work, what they mean, and how to use them naturally. UNDERSTAND KOREAN GRAMMAR Grammar becomes easier when you understand the patterns behind it. OLK breaks down Korean grammar into clear explanations with practical examples, covering: Polite speech and everyday conjugations. Regular and irregular verbs and adjectives. Vowel contractions and word endings. Negation using 안, 못, and 없다. Sentence connectors, particles, and other essential structures. Learn not just what to say, but why it works. PRACTISE READING AND EVERYDAY KOREAN Build confidence with guided Korean reading passages, everyday expressions, and practical language examples. Review pronunciation, reveal translations, explore grammar patterns within passages, and check your understanding as you go. LEARN, SAVE, AND REVISIT Flashcards and My Words Strengthen your vocabulary with organized flashcard categories covering everyday verbs, expressions, numbers, colors, people, places, and more. Save words you want to remember in My Words and revisit them whenever you're ready to study. Quizzes That Help You Remember Put your knowledge to the test with multiple-choice and typing exercises across Hangul, verbs, adjectives, and negation. Practice recalling what you've learned and review your scores after each round. HEAR KOREAN AS YOU LEARN Tap Korean words to hear their pronunciation using your device's built-in text-to-speech functionality. Listen, repeat, and become more familiar with the sounds of Korean. WHY LEARN WITH OLK? 100% free. No subscriptions, hidden fees, locked lessons, or ads. No account required. Open the app and start learning. Beginner-friendly structure. Learn from Hangul through grammar, vocabulary, and reading. TOPIK I-aligned content. Build a foundation around essential beginner-level Korean. Learn at your own pace. Study, review, and practice whenever it suits you. Built by a learner, for learners. Designed with the challenges of learning Korean in mind. Simple, distraction-free design. Spend more time learning and less time navigating. Whether your interest in Korean began with K-dramas, K-pop, travel, culture, or simply a love of languages, OLK gives you a place to start and the tools to keep going. Every word learned is a step forward. 화이팅! You've got this! Questions, suggestions, or feedback? We'd love to hear from you. Email: olkappassist@gmail.com

About

Teacher Moon

Read full description

Learn Korean, English, Japanese, Vietnamese, Chinese and Thai with Teacher Moon. This beginner-friendly app welcomes learners of all ages and backgrounds. Choose a learning language and practice listening, reading, writing and speaking with clear guidance and repeatable activities. [Six Learning Languages] • Korean: trace numbers, consonants, vowels, words and sentences; practice dictation and word spacing. • English: trace letters and numbers; build vocabulary and practice sentence order. • Japanese: trace kana, words and sentences; practice dictation and particles. • Vietnamese: trace letters, numbers, words and sentences; practice dictation and sentence order. • Chinese: trace numbers, basic strokes, 100 basic characters and words; practice dictation and vocabulary. • Thai: trace letters, numbers, words and sentences; practice dictation and word games. [Learn, Read and Play] • Explore flashcards and a personal word list. • Practice sentences with fill-in-the-blank activities and story reading. • Review with tile matching, quiz games, crosswords and word chains. • Listen to and read folk tales and curiosity-themed stories. • Enjoy learning songs, rhythm games and Sky Journey. • Practice speaking with optional on-device speech recognition in supported activities. Familiar screens and controls help you switch learning languages on phones and tablets. Available activities and content vary by language. [Learning Records] Supported learning records stay on the device and can be reviewed in the learning report. Some games award local stars for visual progress. [Ads and Internet Access] This free app displays contextual ads in internal learning and game content. Every ad request uses conservative child-directed treatment and a maximum G content rating for younger learners as well as adults. The app does not use personalized or interest-based ads, remarketing, or tracking that links activity with other companies' apps or websites. It does not request ATT permission or use IDFA. For ad delivery and measurement, and to prevent invalid traffic and fraud, the advertising provider may process IP-derived coarse location, app and ad interactions, diagnostics, and applicable device or other identifiers. Internet is required for first-time setup and security verification. After setup, offline access to the ad-free launch screen and top-level main menu depends on the device’s saved security status. Internal learning and game content requires an internet connection for genuine-app and security checks, protected-content delivery, and ad delivery. Internal content is unavailable when network or ad delivery is blocked. [Privacy and Optional Permissions] The app does not ask for a date of birth or age range. Everyone receives the same child-protective advertising settings. General external links open after a parental check; the privacy policy is directly accessible. Previous local age-category records are removed when the app starts. Microphone and speech-recognition access is requested only when the learner starts speaking practice or voice input in word games such as word chains and quizzes. Supported speech recognition must run on-device; otherwise the activity does not start. Add-only Photos access is used only when the learner chooses to save a created image. The app does not require an account or login. It does not request contacts, a phone number, or precise location. Privacy Policy: https://sites.google.com/view/munsaem Privacy and Support: munsaem@naver.com

Screenshots

OLK4 screens
Teacher Moon4 screens

Verdict

The call

The clearest difference is ads: OLK at none against Teacher Moon's shown. Teacher Moon's advantage is update cadence (every 3 days vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

OLK ships an update every 2 months, Teacher Moon every 3 days. Both last shipped on October 31, 2026.

Scorecard2 real differences · 7 level
OLK versus Teacher Moon: the parameters behind the verdict, then further details
ParameterOLKTeacher Moon
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 2 monthsEvery 3 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.015.5 — better
Further details — not scored
Size23 MB239 MB
Age rating4+4+
DeveloperOlabisi arunaSEONGCHEOL MUN

In-app purchases

None

OLK

No in-app purchases

None

Teacher Moon

No in-app purchases

Questions

Is OLK free?
OLK is free to download, with no in-app purchases.
Is Teacher Moon free?
Teacher Moon is free to download, with no in-app purchases.
Do OLK or Teacher Moon have ads?
Teacher Moon shows ads; OLK does not.
Which is updated more often, OLK or Teacher Moon?
OLK ships an update every 2 months, and Teacher Moon every 3 days. Most recently, OLK was updated on October 31, 2026 and Teacher Moon on October 31, 2026.

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