Privacy Policy

1. Introduction

Kailan (available at kailan.cloud) is a peer document circulation tool operated by Urume Maruboshi ("we," "us," or "our"). We are committed to protecting your privacy and handling your data responsibly.

This Privacy Policy explains what information we collect, how we use it, and your rights regarding your data when you use the Kailan service ("Service").

2. Data We Collect

We collect the following types of information:

2.1 Account Information (via Google Sign-In)

When you sign in with Google, we receive and store:

• Display name
• Email address
• Profile photo URL
• Google user ID (UID)

2.2 User-Generated Content

When you use the Service, we store:

• Kailan titles and descriptions
• Uploaded files (PDF, JPG, PNG, GIF — up to 10 MB each)
• Responses submitted by you or others (type, comment, timestamp)
• Finish times and creation timestamps

2.3 Automatically Collected Data

We may automatically collect:

• Browser type and version
• Device information
• Access timestamps
• Referring URLs

2.4 Analytics Data

We use Google Analytics 4 (GA4) to understand how users interact with the Service. GA4 may collect:

• Pages visited and time spent on each page
• Browser type, device type, and screen resolution
• Approximate geographic location (country/city level, based on IP address)
• Referral source (how you arrived at the Service)
• Interactions with features (e.g., button clicks, form submissions)

Google Analytics uses cookies and similar technologies to collect this data. The data is processed by Google in accordance with the Google Privacy Policy.

You can opt out of Google Analytics tracking by installing the Google Analytics Opt-out Browser Add-on.

3. How We Use Your Data

We use the collected data to:

• Authenticate your identity and manage your account
• Provide, operate, and maintain the Service
• Display your name and photo on Kailans and responses
• Send notifications related to your Kailans (if applicable)
• Improve and develop the Service
• Ensure the security and integrity of the Service

4. Data Storage and Security

Your data is stored using Google Firebase services, including:

• Firebase Authentication — for managing user sessions
• Cloud Firestore — for storing Kailan data and responses
• Firebase Storage — for hosting uploaded files

All data is transmitted over encrypted connections (HTTPS/TLS). Firebase infrastructure is operated by Google and complies with industry-standard security practices. For more information, visit the Firebase Privacy and Security documentation.

5. Data Retention

We retain your data as follows:

• Kailan data — Automatically deleted 7 days after the finish time has passed. This includes titles, descriptions, responses, and uploaded files.
• Account information — Retained as long as you have an active account. You may request deletion by contacting us.
• User-deleted content — When you manually delete a Kailan, all associated data (including stored files) is permanently removed.

6. Data Sharing

We do not sell, rent, or trade your personal information. We may share data in the following limited circumstances:

• With other users — Your name and profile photo are visible to anyone who views a Kailan you created or responded to.
• Service providers — We use the following third-party services to operate Kailan:
  • Google Firebase — for authentication, data storage, and file hosting
  • Vercel — for web application hosting and content delivery
  • Google Analytics 4 — for anonymous usage analytics

  These providers may process your data in accordance with their respective privacy policies.

• Legal requirements — We may disclose data if required by law, regulation, or legal process.
• Safety — We may disclose data if we believe it is necessary to protect the safety of any person or to prevent illegal activity.

7. Cookies and Local Storage

Kailan uses:

• Firebase Authentication tokens — Stored in your browser to maintain your session
• Local Storage — Used to store preferences such as your preferred view mode (card or compact)
• Google Analytics cookies — Used to collect anonymous usage data for service improvement. These cookies are set by Google and are subject to Google's privacy policy.

We do not use third-party advertising cookies or tracking pixels. We use Google Analytics cookies solely for understanding usage patterns and improving the Service.

8. Your Rights

Depending on your jurisdiction, you may have the right to:

• Access — Request a copy of the personal data we hold about you
• Correction — Request correction of inaccurate personal data
• Deletion — Request deletion of your personal data and account
• Portability — Request your data in a portable format
• Objection — Object to certain uses of your personal data

To exercise any of these rights, please contact us at info@kailan.cloud.

9. Children's Privacy

Kailan is not intended for use by children under the age of 13. We do not knowingly collect personal information from children under 13. If we become aware that we have collected data from a child under 13, we will take steps to delete that information promptly. If you believe a child under 13 has provided us with personal data, please contact us at info@kailan.cloud.

10. Google Account Data

Kailan accesses your Google account data solely through the Google Sign-In API. We only request the minimum permissions necessary to provide the Service (profile information and email address).

You can manage your Google account permissions and revoke access at any time through your Google Account Settings.

11. International Data Transfers

Your data may be processed and stored in servers located outside your country of residence, including the United States and other countries where Google operates Firebase infrastructure. By using the Service, you consent to such transfers. We ensure that appropriate safeguards are in place to protect your data in accordance with applicable data protection laws.

12. Changes to This Policy

We may update this Privacy Policy from time to time. If we make material changes, we will notify you by posting the updated policy on the Service and updating the "Last Updated" date. Your continued use of the Service after changes are posted constitutes your acceptance of the revised policy.

13. Contact Information

If you have any questions about this Privacy Policy or our data practices, please contact us at:

info@kailan.cloud