Privacy Policy

Last updated: April 29, 2026

KENTA OSAWA ("we," "us," or "our") establishes this Privacy Policy ("this Policy") regarding the handling of user information in the app SixtySum - Time Calculator ("the App") provided by us.

This Policy applies to the App distributed through the Apple App Store and Google Play Store.

1. Developer Information and Contact

• Developer name: KENTA OSAWA
• App name: SixtySum - Time Calculator
• Contact email address: keyroid.ai@gmail.com
• Support page: https://keyroid.github.io/ks-app/support.html

2. Scope of This Policy

This Policy applies to the App and to user information handled by us in relation to the App.

If the App links to external services, external websites, or third-party services, the policies and terms established by each provider apply to those services.

3. Information We Handle

3-1. Information Entered by Users

The App temporarily handles time values entered by users (hours, minutes, and seconds) and calculation operations inside the App for calculation processing.

This information is not sent to the developer's server.

3-2. Information Stored on the Device

The App keeps calculation history only in memory during the current app session.

Calculation history is not stored permanently. It is deleted when the App is closed or when the user performs the AC operation.

3-3. Information Collected Automatically

The App does not automatically collect user information.

The App does not use analytics SDKs, advertising SDKs, crash analysis SDKs, login SDKs, or billing SDKs.

3-4. Personal Information or Sensitive User Data

The App does not collect or share personal information or sensitive user data.

The App does not request permissions for camera, microphone, location, contacts, photos or videos, notifications, tracking, or similar access.

3-5. Information Through External Services or Third-Party SDKs

The App uses Flutter and url_launcher to open external links.

The App itself does not collect user information through these tools.

However, if a user opens this Privacy Policy from an information link inside the App in an external browser, or opens the shared support page from a store listing page, the external website or hosting service may collect access logs or similar information. In that case, the policy of the relevant external website or service provider applies.

4. Purpose of Use

We do not send information handled in the App to a server.

Time values and calculation history temporarily handled inside the App are used for the following purposes:

• To provide the App's time calculation function
• To display calculation history during the current app session
• To allow users to delete entered values and session history through the AC operation

If a user contacts us by email or another method, we may use information provided by the user in order to respond to the inquiry.

5. Sharing and Third-Party Disclosure

We do not share user information with third parties, except where required by law.

The App also does not use third-party SDKs for analytics, advertising, crash analysis, login, cloud sync, or in-app purchases.

6. Data Storage Method

The App stores data as follows:

• Storage method: Calculation history is kept only in memory during the current app session.
• Server transmission: Calculation data is not sent to the developer's server.
• External service storage: The App does not store users' calculation data in external services.
• Cloud sync: None.
• Backup: None.

7. Secure Handling

We endeavor to manage information handled by the App appropriately and as necessary to prevent leakage, loss, damage, unauthorized access, and similar risks.

The App is designed so that users' calculation data is not sent to the developer's server and is not stored permanently.

8. Data Retention Period and Deletion Policy

The App's calculation history is retained only during the current app session.

• Retention period: Only during the current app session.
• Deletion method: Data is deleted by the AC operation or by closing the App.
• Behavior after reinstallation: Because there is no stored data, there is no data to restore.

Information related to inquiries is retained for the period necessary to respond to the inquiry and is deleted as needed afterward.

9. User Confirmation, Correction, and Deletion

The App does not provide account functionality or permanent storage functionality.

Users can delete entered values and calculation history from the current app session through the AC operation.

For inquiries regarding this Policy, please contact us at the email address below.

• Email address: keyroid.ai@gmail.com

10. Account Deletion

The App does not provide account creation functionality.

Therefore, account deletion procedures do not apply.

11. Use by Minors

Minor users should use the App with the consent of a parent or guardian as necessary.

12. Changes to This Policy

We may change this Policy as necessary due to legal changes, changes to the App, or other reasons.

If important changes are made, we will provide notice in the App or on a public page.

If analytics, advertising, login, cloud sync, in-app purchases, permanent storage, notifications, or other external service integrations are added to the App, we will update this Policy.

13. Contact

For inquiries regarding this Policy, please contact us at the following address.

• Developer name: KENTA OSAWA
• Email address: keyroid.ai@gmail.com
• Support page: https://keyroid.github.io/ks-app/support.html

© KENTA OSAWA. Contact: keyroid.ai@gmail.com