DayStone

Privacy Policy

Last Updated: October 18, 2026

Table of Contents

1. Introduction

MaruSoft (hereinafter referred to as "the Operator") respects the privacy of users of the mobile application "DayStone" (hereinafter referred to as "this App") and is committed to protecting personal information. This Privacy Policy explains our policies regarding the collection, use, and sharing of information in this App.

2. Information We Collect

This App handles the following information. The App has no account registration and never collects contact details such as your name, email address or phone number, nor your precise location.

Information You Provide (stored only on your device)

  • Event information (title, date, counting method (countdown / count-up), repeat, category, icon, background color, memo)
  • Background images set for events (taken by camera or selected from gallery)
  • Notification settings (on-the-day and advance reminders, milestone reminders, reminder time)
  • App settings (color theme, appearance mode, language)

Automatically Collected Information

  • Advertising identifier (IDFA/GAID); on iOS only if you allow tracking
  • Device information, approximate region inferred from your IP address, and ad impressions and interactions (collected by Google AdMob for ad delivery)
  • Diagnostic information such as crash and performance data (collected by Google AdMob)
  • Purchase history and an anonymous ID that identifies your purchase (collected by RevenueCat)

Information Processed for In-App Purchases

  • Purchase history (premium purchase status)
  • Platform information related to purchases

* Payment processing is handled through RevenueCat, Inc. via each platform (Apple/Google). The Operator does not collect or store payment information such as credit card details. For details, please see RevenueCat's Privacy Policy.

3. How We Use Your Information

We use the collected information for the following purposes:

  • Providing countdowns to important days, count-ups from days you started, and anniversary tracking
  • Delivering on-the-day, advance and milestone (100 days, 1 year, etc.) reminders. Reminders are scheduled on your device and do not go through any external server
  • Displaying event information on home screen widgets
  • Displaying and optimizing advertisements
  • Processing in-app purchases and providing premium features
  • Detecting problems and improving the app's quality

4. Sharing with Third Parties

The Operator will not provide your personal information to third parties except in the following cases:

  • When we have your consent
  • When required by law
  • When necessary to protect the life, body, or property of a person
  • Advertising identifiers and device information are automatically sent to Google LLC (AdMob) for ad delivery
  • Purchase-related information is sent to RevenueCat, Inc. for payment processing

5. Advertising

This App uses Google AdMob (Google LLC) for advertising.

Information Collected for Advertising

  • Advertising identifier (IDFA/GAID)
  • Device information
  • IP address
  • App usage data

On iOS, we ask for permission to track under App Tracking Transparency (ATT). If you do not allow it, the advertising identifier is not used and non-personalized ads are shown. If you buy Premium (a one-time purchase), no ads are shown.

For more details, please see Google's Privacy Policy.

6. Data Storage and Security

To protect user privacy, this App primarily stores data on your device. The Operator does not store user data on its own servers.

  • Data entered in this App (events, photos, settings) is stored on your device
  • Information shown on home screen widgets is only shared between the app and its widgets on your device
  • Your personal data is not transmitted to or stored on the Operator's servers, so data cannot be synced between devices
  • Data may be lost due to device loss, malfunction, or app deletion. It may be included in your operating system's backups

7. Your Rights

You have the following rights regarding your information:

  • Right of Access: You can view the data you entered in this App at any time within the app
  • Right to Deletion: You can delete all data on your device by uninstalling the app
  • Advertising Opt-out: You can limit ad tracking through your device settings
  • Data Editing: You can edit or delete event information at any time within the app
  • Image Deletion: Background images set for events can be deleted from within the app
  • Purchase Management: Purchase management can be done through App Store or Google Play settings. When you change devices, use "Restore Purchases" in the app to restore Premium

8. Children's Privacy

This App is not intended for children under the age of 13. The Operator does not knowingly collect personal information from children under 13. If we learn that personal information has been provided by a child under 13, we will promptly delete such information.

9. International User Rights (GDPR/CCPA)

This App is available in 10 languages worldwide. Users residing in the EU, UK, California, and other jurisdictions may have the following additional rights.

EU/UK Users (GDPR)

Under the EU General Data Protection Regulation (GDPR) and UK GDPR, you have the following rights:

  • Right of access (to know what personal data is held)
  • Right to rectification (to request correction of inaccurate data)
  • Right to erasure ("right to be forgotten")
  • Right to restriction of processing
  • Right to data portability
  • Right to object to processing
  • Right to lodge a complaint with a supervisory authority

Since most personal data in this App is stored only on your device, these rights can primarily be exercised by uninstalling the App and deleting device-stored data. For data transmitted to third parties (AdMob, RevenueCat), you may exercise your rights in accordance with their respective privacy policies.

California Users (CCPA/CPRA)

Under the California Consumer Privacy Act (CCPA) and California Privacy Rights Act (CPRA), you have the following rights:

  • Right to know what personal information is collected and its specific contents
  • Right to request deletion of personal information
  • Right to request correction of personal information
  • Right to opt-out of the "sale" or "sharing" of personal information
  • Right to non-discrimination for exercising these rights

The Operator does not "sell" personal information as defined by CCPA. Providing device identifiers to AdMob for ad delivery may constitute "sharing" under CCPA. You can opt-out via iOS App Tracking Transparency (ATT) or by enabling the advertising tracking restriction in your device settings.

10. Changes to This Policy

The Operator may change this Privacy Policy as necessary. If there are significant changes, we will notify you through this App. If you continue to use this App after the changes, you will be deemed to have agreed to the revised Privacy Policy.

11. Contact Us

For questions or inquiries regarding this Privacy Policy, please contact us through the following form.

Contact Form