똑똑보카-잠금화면 영어, 일본어, 중국어 학습 단어장 - Language Learning & Earning
Unlock language skills & earn rewards with quick, engaging lessons and smart quizzes in just 2 minutes daily!

- 1.0.20 Version
- 1.5 Score
- 388K+ Downloads
- Free License
- 3+ Content Rating
A small start in the world can lead to a lasting habit!
Sign up for Ttukboca, a language learning application that allows you to study while earning money in just 2 minutes daily.
Highlights
- Low entry, high returns
- Free learning in multiple languages
- Practical and easy-to-redeem rewards
- AI customization + high retention rate
- Course segmentation and adaptation
[Knock Knock Vocabulary Key Features]
📚 Explore various language courses!
- Dive into English, Japanese, Chinese, Korean vocabulary, the Bible, and even general knowledge! You can free access any language of your choice within a single app.
💰 Learn and earn money!
- Complete engaging quizzes and receive cash rewards.
- There are additional ways to increase your earnings through habitual missions that encourage consistent learning and quick 2-minute study sessions.
🍫 Redeem gifticons from the money you accumulate after studying!
- Your earned cash can be exchanged right away for gifticons such as Naver Pay points, Starbucks coffee, Google Play gift cards, and convenience store vouchers.
📱 Easily accessible on your lock screen, allowing you to quickly learn multiple expressions!
- All educational material is tailored through AI data analysis to create a personalized curriculum.
- The rate of continuous learning is 3.78 times higher compared to typical language apps, promoting efficacy with only 2 minutes of study each day.
- Language acquisition thrives on repetition! Since content is often shown on the lock screen, it becomes ingrained effortlessly.
📊 Tailor your course selection!
- English: Cover a range of topics including vocabulary for everyday use, native speaker conversation phrases, TOEIC exam preparation, and academic vocabulary.
- Chinese Characters: Pick from subjects like the Chinese Character Proficiency Test, daily usage, or four-character idioms.
- Japanese: Choose methods for reading hiragana and katakana, vocabulary by JLPT level, and common Japanese terms.
- Chinese: Select vocabulary based on HSK levels and everyday difficulty.
- Korean Vocabulary: Learn Korean words by difficulty, including idioms and commonly confused terms.
- Current affairs and common knowledge: Opt for general information applicable in daily life or dive deeper into fields such as management/marketing, economics, science, international relations, technology, and history.
- Bible: Access specific chapters or verses you wish to study.
No more need for physical vocabulary books or multiple language learning applications!
With Tttboca, you can immerse yourself in English, Chinese characters, Japanese, Chinese, Korean vocabulary, current events knowledge, and even Bible studies – all within one application.
Enhance both personal development and cognitive health through the joy of learning languages!
Start your journey with Tttboca today.
Reviews
1. Just 2 minutes a day to learn vocabulary and earn rewards! Learn multiple languages including English, Japanese, Chinese, and Korean. You can even memorize words while your screen is locked – super easy to stick to!
2. One app for multilingual vocabulary! AI-generated personalized learning plans, quizzes to earn gift cards – practical and motivating, it's amazing!
3. Clean interface, detailed course categories, perfect for learning in short bursts of time, easy to redeem rewards, and the memorization effect is far superior to ordinary vocabulary apps. Highly recommended!
FAQ
### 1. What languages can I learn in "Smart Vocabulary" (똑똑보카)?
You can learn vocabulary in multiple languages, including English, Chinese characters, Japanese, Chinese, and Korean. Each language has specialized thematic courses, such as TOEIC preparation for English and four-character idioms for Chinese characters, to meet different needs.
### 2. How do I earn bonuses in "Smart Vocabulary"?
You can earn bonuses primarily by taking "Smart Quizzes" (똑똑퀴즈). You can also earn bonuses by completing habitual tasks that encourage continuous learning. It takes only about two minutes a day to participate, and the more you invest in learning, the more you earn.
### 3. How can I use the bonuses I earn?
You can redeem them for gift certificates at tens of thousands of participating stores nationwide, such as Starbucks coffee vouchers, GS convenience store vouchers, and Naver Pay points. These can be used for everyday purchases and are very convenient to use directly after redemption.
### 4. How are "Smart Vocabulary" courses organized?
We use AI data analysis to create customized courses, adjusting content based on your learning progress and weaknesses. Starting from the homepage each day, you can complete your daily tasks in just two minutes, making it ideal for fragmented time.
### 5. What are the advantages of "Smart Vocabulary" compared to other language apps?
The learning retention rate is 3.78 times higher than that of other apps, and you can view learning content on the lock screen to strengthen your memory. Furthermore, you can learn multiple languages for free in one app, and with instant bonuses, it's even easier to stick with your studies.
- Version1.0.20
- UpdateSep 29, 2026
- Developer트리거스
- CategoryEducation
- Requires AndroidAndroid 8.0+
- Downloads388K+
- Package Namecom.knockknock.voca
- Signaturefed578a771c23de2db759de0456629da
- Available on
- ReportFlag as inappropriate


















Learn multiple languages for free, with a wide range of courses to choose from.
Earn bonuses after completing quizzes, highly motivating.
AI-customized courses + daily 2-minute learning breaks make it easy to stick with your lessons.
Bonus redemption depends on participating stores, and selection may be limited in some regions.
Low-level professional language learning content is limited.
Offline functionality is not available, and poor network connectivity may affect performance.