KotsuKotsu: JLPT Vocabulary

KotsuKotsu: JLPT Vocabulary

Kana to N1, before you forget

0 ratings
2 reviews
Free

Details

Released
August 24, 2026
Updated
October 10, 2026

Features

KotsuKotsu: JLPT Vocabulary screenshot #1 for iPhone
KotsuKotsu: JLPT Vocabulary screenshot #2 for iPhone
KotsuKotsu: JLPT Vocabulary screenshot #3 for iPhone
KotsuKotsu: JLPT Vocabulary screenshot #4 for iPhone
KotsuKotsu: JLPT Vocabulary screenshot #5 for iPhone
KotsuKotsu: JLPT Vocabulary screenshot #6 for iPhone
KotsuKotsu: JLPT Vocabulary screenshot #7 for iPhone
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About

This app uses spaced repetition to help you memorize Japanese vocabulary for JLPT levels. It intelligently schedules reviews based on your learning curve, focusing on words you're about to forget. Track your progress and learn efficiently without distractions.

✓Spaced repetition algorithm (FSRS)
✓18,557 Japanese vocabulary words
✓JLPT N5 to N1 coverage
✓Daily flashcard scheduling
✓Visual progress tracking (heatmap, temperature)
✓Offline audio playback
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What's New in KotsuKotsu

1.2.2

October 10, 2026

- You can now change the voice right from the gear on the study screen. Pick one and the current word plays in that voice. - Word lists no longer cut off words or readings. A long reading moves to the next line, and meanings show up to three lines. - Hide readings and Hide meanings now cover answers with clean bars instead of a blur, on the kana charts too. - Fixed pronunciation sometimes not playing when you reveal several hidden rows in a row. - Tidied up line breaks on narrow screens and the message for empty collections.

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User reviews

‘가’ 발음 오류

정말 잘 쓰고 있습니다!!
다름이 아니라 が와 ガ 발음이 ‘가’가 아닌 ‘라’로 나와서 문의드립니다..!!

Response from developer

안녕하세요, 리뷰 남겨 주셔서 감사합니다! 확인해 보니 が·ガ 녹음은 '가'로 되어 있지만, 하루카 목소리는 g 소리를 부드럽게 내는 편이라 말씀하신 대로 낱자로 들으면 '라'에 가깝게 들릴 수 있어요. 설정의 「목소리」에서 아오이·타쿠미·리쿠로 바꾸시면 '가'로 더 또렷하게 들으실 수 있습니다. 다음 업데이트에서는 학습 중에도 카드 아래 톱니 버튼에서 목소리를 바로 바꾸실 수 있도록 개선해 보겠습니다!

앱은 정말 좋은거같은데 소리가 안나와요 ㅠㅠㅠ

정말 잘 쓰고있습니다 ㅠㅠ
따로 저장할필요도 없이 단아만 외우면 되서 좋은데 소리가 안나와서 외우기가 빡세네요 빨리 고쳐주세요ㅠㅠ

Response from developer

안녕하세요, 코츠코츠 개발자입니다. 좋게 봐 주셔서 감사하고, 소리 문제로 불편을 드려 죄송합니다. 확인해 보니 발음 서버는 정상이었고, 아이폰 벨소리를 무음으로 두면 발음도 함께 무음이 되는 버그가 있었습니다. 발음은 벨소리와 무관하게 나와야 하는 소리라 무음 모드에서도 재생되도록 고쳤고, 1.1.5 업데이트로 나갈 예정입니다. 업데이트 전까지는 측면 스위치를 벨소리로 두시면 소리가 납니다. 발음 목소리와 볼륨은 오른쪽 위 톱니로 여는 설정 화면 아래쪽에서 바꾸실 수 있고, 발음을 미리 받아 두면 인터넷 없이도 들을 수 있습니다. 업데이트 뒤에도 소리가 나지 않으면 contact@kotsu-kotsu.app 으로 기종과 iOS 버전, 무음 스위치 상태, 어느 화면에서 소리가 나지 않는지 알려 주세요. 바로 살펴보겠습니다.

Developer apps

FAQ

What is KotsuKotsu's learning methodology?

KotsuKotsu utilizes the spaced repetition system (SRS), specifically the FSRS algorithm, to schedule vocabulary reviews. This method is scientifically proven to enhance long-term memory retention by presenting words at optimal intervals before you forget them.

How does KotsuKotsu track my learning progress?

The app assigns a 'temperature' to each word, visually indicating its position on your personal forgetting curve. You can also view a heatmap of your study activity and track your streak and accuracy to monitor your overall progress.

Does KotsuKotsu offer JLPT certifications?

KotsuKotsu is designed to help you memorize vocabulary relevant to the JLPT exams (N5 through N1), but it does not offer official certifications. Its focus is on building your vocabulary knowledge base for the test.

Can I use KotsuKotsu offline?

Yes, KotsuKotsu supports offline audio playback for vocabulary words. You can download the audio for four different voices to listen to words without an internet connection.

How many vocabulary words does KotsuKotsu contain?

KotsuKotsu includes a comprehensive database of 18,557 Japanese vocabulary words, covering everything from hiragana and katakana to words beyond the JLPT N1 level.

Is KotsuKotsu suitable for beginners?

Absolutely. KotsuKotsu starts with the basics, including hiragana and katakana, and progresses through all JLPT levels. The app's intelligent scheduling makes it effective for learners at any stage.

How often is KotsuKotsu updated?

The latest version of KotsuKotsu is 1.2.1, which was last updated on October 5, 2026. Updates typically include refinements to the learning algorithm and vocabulary database.

What devices does KotsuKotsu support?

Currently, KotsuKotsu is available for iPhone devices. Future platform expansions may be considered based on user demand and development resources.