This privacy policy applies to the Challenge Log - チャレンジログ - app (hereby referred to as "Application") for mobile devices that was created by yokokubo (hereby referred to as "Service Provider") as an Ad Supported service. This service is intended for use "AS IS".

Information Collection and Use

The Application collects information when you download and use it. This information may include information such as:

• Your device's Internet Protocol address (e.g. IP address)
• The pages of the Application that you visit, the time and date of your visit, the time spent on those pages
• The time spent on the Application
• The operating system and version you use on your mobile device
• Device identifiers used for push notification delivery (e.g., Firebase Cloud Messaging tokens)
• Application version and crash diagnostics

The Application does not collect precise information about the location of your mobile device.

For a better experience, while using the Application, the Service Provider may require you to provide us with certain personally identifiable information, including but not limited to:

• Email address (when you create an account)
• User ID (Firebase Authentication unique identifier)
• Display name (optional, user-provided)
• Avatar image (optional, user-provided)

The Application also stores content you create within the app, including:

• Challenge records (dates, mood entries, notes)
• Timer presets and session logs
• Notification schedules and preferences
• Calendar sharing data (when you use the sharing feature)