Last updated: October 25, 2026
This English version is provided for convenience. In case of any discrepancy between the Japanese version and this English version, the Japanese version shall prevail.
Dotnull Inc. (the “Company”, “we”, “our”, or “us”) establishes this Privacy Policy (the “Policy”) regarding the handling of users’ personal information in the application “MorseLink” (the “App”) provided by the Company.
Article 1 (Information We Collect)
To provide the App, we may collect the following information.
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Information you provide
- Account information: Email address, or authentication information for Google/Apple accounts (OAuth ID)
- Profile information: Nickname, icon image, and other information you optionally set
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Information collected automatically through your use of the App
- Learning metrics: Energy consumption/recovery history, AI chat history, drill results, quest progress, etc.
- Device information: Device type (iOS/Android), OS version, language settings, advertising ID (Advertising ID)
- Log information: Operation logs, crash reports, and performance data collected via Firebase Analytics and Firebase Crashlytics
- Notification token: A token used to send push notifications
- Cookies and SDKs: The App uses third-party SDKs such as Firebase SDK. These modules may collect and use cookies and advertising IDs to analyze usage and deliver advertisements.
Article 2 (Purposes of Use)
We use the collected information for the following purposes.
- To provide, operate, maintain, protect, improve, and enhance the App
- To store your learning history, manage progress, and customize your learning experience
- To generate responses for the AI coach feature (including sending data to the OpenAI API)
- To provide energy management, quest progression, and other gamification features
- To respond to inquiries, consultations, and complaints, and to resolve disputes
- To inform you about new features, updates, campaigns, etc.
- To address violations of the Terms of Service
- To create and analyze statistical data in a manner that does not identify individuals, and to conduct marketing activities
Article 3 (Provision to Third Parties / Outsourcing)
We do not provide your personal information to any third party except in the following cases.
- With your consent
- When required by laws and regulations
- When necessary to protect a person’s life, body, or property and it is difficult to obtain consent
- When particularly necessary to improve public health or promote the sound growth of children and it is difficult to obtain consent
- When it is necessary to cooperate with a national agency, local government, or an entity entrusted by them in performing duties prescribed by laws and regulations, and obtaining your consent may impede the performance of such duties
To the extent necessary to achieve the purposes of use, we may outsource all or part of the handling of personal information to the following third parties. In such cases, we will provide necessary and appropriate supervision to ensure safe management of information by the outsourcing parties.
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OpenAI, L.L.C.
- Purpose: Generating responses for the AI chat feature
- Information provided: Inputs to the AI chat (we may process inputs to exclude information that can identify individuals)
- Location: United States
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Google LLC (Firebase)
- Purpose: User authentication, database, storage, analytics, crash reporting, push notifications
- Information provided: Account information, learning metrics, device information, log information
- Location: United States
Article 3-2 (Advertising and Your Privacy Choices)
The free version uses Google AdMob, provided by Google LLC, for banner, full-screen, and optional rewarded advertisements. Google and the advertising partners involved in serving an ad may receive your IP address, approximate location derived from it, device and app information, advertising identifiers where permitted, ad requests, impressions and interactions, and your privacy choices. They use this information to deliver and measure ads, personalize ads where permitted, research audiences, develop and improve advertising services, and detect fraud and abuse. Advertising SDKs may use cookies or other storage on your device.
Google's use of information is explained in its Privacy Policy and How Google uses information from apps that use its services. Where a consent message is shown, its advertising-partner list provides the applicable partners and links to their policies. The Company does not pass your learning answers, practice text, or chat messages to AdMob as advertising-targeting parameters.
Where consent is required, including in the EEA, the UK and Switzerland, the updated app uses Google's User Messaging Platform (UMP) to present the applicable choices before requesting ads. You may decline consent; the app does not require consent to personalized advertising to continue learning. Depending on your choices and availability, you may receive limited ads or no ads. Limited ads do not use personal data for ad personalization, but may still process an IP address to deliver an ad and use cookies or local storage solely to detect fraud and abuse.
In versions with this feature, you can review or change your choice in Settings > Advertising privacy settings whenever the applicable consent platform requires this option. If the settings cannot be loaded, you can retry there. Changing a choice applies to subsequent ad requests; it does not erase earlier processing. Older versions may not have this control; update the app or contact the address in Article 9. Your device's advertising or tracking settings provide additional controls. On iOS, permission for tracking under App Tracking Transparency is separate from advertising consent; a consent choice does not grant that system permission.
Ad-related information held by Google or its partners is handled under their own retention and deletion policies. Deleting your MorseLink account does not automatically delete information those providers retain independently. Use their privacy controls or contact us for help with an applicable access, deletion, objection, or withdrawal request.
Article 4 (International Data Transfers)
As described in Article 3, we provide your information to third parties located in the United States. For information regarding personal information protection systems in the United States, please refer to information provided by Japan’s Personal Information Protection Commission.
Reference: Survey of systems related to the protection of personal information in foreign countries
Article 5 (Retention Period and Requests for Deletion)
- We retain your information while you have an account for the App.
- If you withdraw from the App, we will delete your information within 30 days after withdrawal unless retention is required by laws and regulations or business necessity.
- You may request disclosure, correction, addition, deletion, or suspension of use of your personal information. If you wish to make such a request, please contact us at the contact point in Article 9 with information that allows us to verify your identity (e.g., your email address). After confirming your identity, we will respond promptly in accordance with applicable laws and regulations.
Article 6 (Security Measures)
We strive to keep your personal information accurate and up-to-date and take the following security measures to protect it from unauthorized access, tampering, leakage, loss, or damage.
- Encrypted communications: Communications between your device and our servers are encrypted using SSL/TLS.
- Access controls: Access to personal information is limited to employees who need it for business purposes, and we implement access controls.
- Incident response: In the event of a leakage incident or similar, we will report to relevant authorities and notify users promptly in accordance with laws and regulations.
Article 7 (Push Notifications)
To support your continued learning, we may send push notifications such as cooldown completion notices, summaries of unread messages, and quest suggestions. You can stop these notifications at any time from your device settings.
Article 8 (Changes to This Privacy Policy)
We may revise this Policy as necessary. If we make changes to this Policy that require user consent under laws and regulations, the revised Policy will apply only to users who have consented to the changes by a method prescribed by the Company. When we revise this Policy, we will notify users of the effective date and contents of the revised Policy by displaying it on our website or by other appropriate methods, or by directly notifying users.
Article 9 (Contact)
For opinions, questions, complaints, and other inquiries regarding the handling of user information, please contact:
DOTNULL Co.,Ltd
support@morse-link.com