Kotobask: Japanese Vocabulary
Master vocabulary fast
Only for iPhone
Free · In-App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Kotobask is a fast, focused vocabulary trainer for JLPT preparation and for anyone building a solid Japanese vocabulary base.
STUDY 2,500 ESSENTIAL WORDS
• Learn across 25 decks covering JLPT levels N5, N4, N3, N2, and N1, plus General Essentials
• Every word includes a reading, English meaning, example sentence, and audio
• Choose any 5 decks free when you start, then unlock other decks individually
QUIZ YOUR WAY
• Practice Japanese → English, English → Japanese, Listening, or Sentence questions
• Complete 2,500 sentence questions by choosing the word that fits each blank
• Reveal an English hint when you need help with a sentence
• Practice All Words, Saved Words, My Vocab, Topics, or Situations
• Retry wrong answers or focus on new and weak words
EXPLORE WORDS IN DEPTH
• See clear representative translations with helpful alternative translations
• Study separate meanings and example sentences for words with multiple meanings
• Show complete example-sentence readings in hiragana or romaji
HEAR EVERY WORD
• Audio for all 2,500 built-in words and example sentences
• Bundled audio works offline with no waiting or streaming
TRACK YOUR MASTERY
• Five mastery levels from New to Perfect, based on recent answers and speed
• See mastery changes after practice
• Review accuracy, streaks, activity, overall progress, and deck progress
• Switch activity trends between week, month, and year views
MAKE IT YOURS
• Save useful words for later review
• Add personal vocabulary cards with My Vocab
PRIVATE BY DESIGN
• No account required
• No ads and no cross-app tracking
• Learning progress is stored on your device and backed up under an anonymous ID
Whether you are preparing for the JLPT or building everyday Japanese vocabulary, Kotobask keeps every session short, focused, and satisfying.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Improved audio playback stability and fixed a rare crash on iOS. Custom My Vocab audio now handles unavailable network audio without interrupting your study session.
The developer, Shoko Yoshioka, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- User Content
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Shoko Yoshioka
- Size
- 168.7 MB
- Category
- Education
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Classification
4+
- 4+
- In-App Purchases
Yes
- General Essentials 4 $1.99
- General Essentials 2 $1.99
- General Essentials 3 $1.99
- General Essentials 1 $1.99
- JLPT N2 Vocabulary Deck 3 $1.99
- JLPT N1 Vocabulary Deck 2 $1.99
- JLPT N2 Vocabulary Deck 2 $1.99
- JLPT N3 Vocabulary Deck 3 $1.99
- JLPT N4 Vocabulary Deck 7 $1.99
- JLPT N4 Vocabulary Deck 6 $1.99
- Copyright
- © 2026 Fimo