Kotrin
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1+
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Everyone
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About this app
Stop switching between apps to learn Japanese. Meet the first all-in-one platform designed to take you from beginner to fluent through a truly personalized experience. Whether you're mastering your first Hiragana or preparing for the N1 test, our AI-powered engine builds the perfect curriculum for your goals.
Most apps focus on just one skill. We focus on all of them. Our unique "Language Embedding" technology analyzes your proficiency and interests across 1,500+ parameters to ensure every lesson feels relevant, engaging, and exactly at your level.
The Complete Japanese Suite: One app for everything. Master Speaking, Reading, Writing, and Listening in a single, unified workflow.
Massive Lesson Library: Access 5,000+ in-depth lessons covering "Can-Do" real-life scenarios, essential grammar, and core vocabulary.
24/7 Personal AI Tutor: Stuck on a sentence? Ask your AI Sensei. Fine-tuned by Japanese linguistics experts, your tutor provides instant explanations and custom practice cards.
Interactive Kanji Writing: Don't just look at characters—write them. Our custom handwriting widget guides you through Hiragana, Katakana, and all 2,136 Joyo Kanji.
Real-World Audio: Skip the "textbook" robot voices. Listen to natural dialogues and scenarios to master the rhythm, slang, and intonation of native speakers.
Smart Accuracy Quizzes: Sharpen your skills with AI-driven quizzes that identify your weak spots and help you fix them through active recall.
Stay Motivated: Track your daily growth with streaks and progress boards designed to turn language learning into a rewarding daily habit.
By using advanced language profile embeddings, we don’t just give you a course; we give you a path. The app evolves as you do, matching your interests—whether it’s business, travel, or culture—with the right content at the right time.
Start your Japanese journey today. All-in-one. All for you.
Terms of Use: https://kotrin.jp/terms
Privacy: https://kotrin.jp/privacy
Support/Contact: https://kotrin.jp/contact
Most apps focus on just one skill. We focus on all of them. Our unique "Language Embedding" technology analyzes your proficiency and interests across 1,500+ parameters to ensure every lesson feels relevant, engaging, and exactly at your level.
The Complete Japanese Suite: One app for everything. Master Speaking, Reading, Writing, and Listening in a single, unified workflow.
Massive Lesson Library: Access 5,000+ in-depth lessons covering "Can-Do" real-life scenarios, essential grammar, and core vocabulary.
24/7 Personal AI Tutor: Stuck on a sentence? Ask your AI Sensei. Fine-tuned by Japanese linguistics experts, your tutor provides instant explanations and custom practice cards.
Interactive Kanji Writing: Don't just look at characters—write them. Our custom handwriting widget guides you through Hiragana, Katakana, and all 2,136 Joyo Kanji.
Real-World Audio: Skip the "textbook" robot voices. Listen to natural dialogues and scenarios to master the rhythm, slang, and intonation of native speakers.
Smart Accuracy Quizzes: Sharpen your skills with AI-driven quizzes that identify your weak spots and help you fix them through active recall.
Stay Motivated: Track your daily growth with streaks and progress boards designed to turn language learning into a rewarding daily habit.
By using advanced language profile embeddings, we don’t just give you a course; we give you a path. The app evolves as you do, matching your interests—whether it’s business, travel, or culture—with the right content at the right time.
Start your Japanese journey today. All-in-one. All for you.
Terms of Use: https://kotrin.jp/terms
Privacy: https://kotrin.jp/privacy
Support/Contact: https://kotrin.jp/contact
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
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This app may collect these data types
Personal info, App activity, and Device or other IDs
Data is encrypted in transit
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About the developer
BLUE COMMONS, K.K.
hey@kotrin.jp
1-26-2, NISHIGOTANDA
GOTANDA SAN HEIGHTS 911
SHINAGAWA-KU, 東京都 141-0031
Japan
+81 50-5364-2150