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App Store Apps > Education > Kusari
Kusari icon

Kusari

by RYUTA ABE · Education · Free
On the App Store since May 2026 · Data updated 2026-11-04

Kusari is made and published by RYUTA ABE. AppBrain is an independent app data site and isn't affiliated with RYUTA ABE. The app name, icon, screenshots and description belong to RYUTA ABE and are shown as published on the App Store.

AppBrain's verdict

Last updated
August 14, 2026
Official page on the App Store

Rankings

App Store top charts

App Store Rankings for Kusari

This app is not ranked

Releases

Updates seen on the App Store
Version
1.1.0
Launched
May 2026

No changelog data

User feedback

Ratings and reviews on the App Store

Comments on Kusari for iOS

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Technology

Found in the app by AppBrain
Price
Free
App size
123.4 MB
Content rating
Everyone

Technologies used by Kusari

About the app and developer

About Kusari

Kusari is an education app developed by RYUTA ABE.

User Ratings

The app has no ratings yet.

App Information

Kusari is freely available from the App Store. The app size is 123.41 MB. The latest version available is 1.1.0. The last update was on August 14, 2026.

Technical Requirements

The app has a content rating of Everyone. The app has been available on the App Store since May 2026.

Developer information for RYUTA ABE

RYUTA ABE

Address:

Share Kusari

Store listing

By RYUTA ABE, from the App Store
Kusari Screenshot 1 of 5
Kusari Screenshot 2 of 5
Kusari Screenshot 3 of 5
Kusari Screenshot 4 of 5
Kusari Screenshot 5 of 5
Screenshots by RYUTA ABE, from the the App Store listing
Description by RYUTA ABE Written by the developer, not by AppBrain. Click to read.
意志が弱いんじゃない。逃げ場が、あるだけだ。

Kusariは、毎日の英語学習を「鎖」で習慣に変えるアプリです。読む、話すの2ステップ、1日15分ほど。意志の力ではなく、設計で続けます。

コミットメント・デバイス(自分への約束を仕組みで守る装置)の研究をもとに設計しています。Yaleの研究者らが立ち上げたstickKなどで知られる手法です。Kusariは同大学と提携・監修関係にはありません。

料金は、続けた日数で決まります。

通常価格 月¥5,000(自動更新)。直近30日の達成日数によって、翌月のご請求が5段階で変わります。

・24日以上 ¥0
・18〜23日 ¥1,000
・12〜17日 ¥2,500
・6〜11日 ¥4,000
・5日以下 ¥5,000(通常価格)

日数に比例して安くなるのではなく、上の5段階で決まります。
割引の適用には、更新日の前にアプリ内で申請の操作が必要です(Appleの仕様上、自動では適用できません)。アプリが更新前にお知らせします。

最初の7日間は、登録なしでお試しいただけます。8日目にご登録いただくと、そこから30日間の無料トライアル(初回のみ)が始まり、最初のご請求はその後です。
お試し期間7日分の記録は、ご登録後のアカウントには引き継がれません。
サブスクリプションは自動更新です。期間終了の24時間前までに、iPhoneの「設定」>ご自身のApple ID>サブスクリプションから解約できます。

今は三日坊主でも大丈夫です。続けられる自分に変わるための仕組みだけ、用意しました。
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