Introduction
毎晩子どもに絵本の読み聞かせをしてるパパ・エンジニアが作った「読み聞かせ管理アプリ YONDAYO(ヨンダヨ)」は 読み聞かせを思い出に変えて記録するアプリです。 「読み聞かせた回数」や「読んだ絵本の数」の管理はもちろん、絵本に「持ってる」「買いたい」などのラベルをつけて蔵書管理としても使用できます。 メールアドレスなどでのユーザー登録や広告はありません。インストール後にすぐにお使いいただけます。 他にも下記の機能を利用できます。 ・複数のお子さまに対応しています。 ・お子さま別に絵本への「読んだ回数」「簡単なリアクション」と「一言メモ」が記録できます。 ・お子さまの読書データの累計はもちろん、年ごとにグラフ表示も可能です。 ・バーコードスキャン、タイトルまたは作者名で簡単に絵本を検索 ・アプリ利用者のデータを元にした「年齢別絵本ランキング」でまだ知らない絵本と出会えるかもしれません。 ・絵本を借りれられる図書館を簡単に検索できます。 【プライベートで安心】 登録されたお子さまの「名前、生年月日、画像」などはお使いのスマートフォンにのみ保存されクラウドにアップロードされることはありません。 そのため安心にお使いいただけます。
- Release
- 2025-10-05
- Update
- 2026-01-13
Privacy Policy
This privacy policy applies to the free application "yondayo" (hereinafter "the App") developed and provided by CoComina (hereinafter "we"). The App is provided as is.
By using the App, you are deemed to have agreed to the processing of information in accordance with this privacy policy, including any current and future revisions.
Information We Collect and Use
The App may collect the following information when you download and use it:
- Your device's IP address
- Pages viewed within the App, visit times, and duration of stay
- App usage time
- Your mobile device's operating system
The App does not collect precise location information from your mobile device.
We may use the information you provide to deliver important information, necessary notifications, and marketing promotions.
To provide better service, we may ask you to provide personally identifiable information when you use the App. Information we collect will be retained and used in accordance with this privacy policy.
Third-Party Access
To improve our services, we may periodically send anonymized aggregate data to external services. We share your information with third parties only in the manner described in this privacy policy.
The App also uses third-party services that have their own privacy policies. Below are links to the privacy policies of third-party service providers used by the App:
We may disclose information provided by you and information collected automatically in the following cases:
- When required to comply with legal process (e.g., subpoenas)
- When we believe in good faith that disclosure is necessary to protect our rights, the safety of users or others, to investigate fraud, or to respond to government requests
- With trusted service providers who perform services on our behalf, do not use the information for their own purposes, and have agreed to comply with the terms of this privacy policy
Your Right to Opt Out
You can stop all information collection by uninstalling the App. Uninstallation can be done using the standard method provided by your mobile device or the app marketplace.
Data Retention Policy
We retain data provided by you during your use of the App and for a reasonable period thereafter. If you wish to delete data provided through the App, please contact us at the contact information below. We will respond within a reasonable period.
Children
We do not intend to collect data from children under 13 or to market to children. If we learn that personal information has been provided by a child under 13, we will delete it from our servers promptly. If you are a parent or guardian and become aware that your child has provided personal information, please contact us at the contact information below so we can take the necessary steps.
Security
We take the protection of your information seriously. We have implemented physical, electronic, and procedural safeguards to protect the information we process and maintain.
Changes
This privacy policy may be updated from time to time for any reason. When changes are made, we will update this page to notify you. We recommend that you check this page periodically for any changes. Your continued use of the App constitutes acceptance of the changes.
Contact
If you have any questions about privacy regarding your use of the App or about our practices, please contact us via the form below or by email at support@cocomina.com.
Contact
For inquiries or feedback about this app, please contact us through the form below.
Developer

Tsukasa Chinen
Designer, Front-end Engineer
Language etc.
- TypeScript
- React Native
- Expo