Privacy Policy

Last Updated: June 9, 2026

Introduction

At Kunkun ("we", "our", or "us"), we are committed to protecting your privacy and ensuring the security of your data. This Privacy Policy explains how we collect, use, and safeguard your information when you use our Kunkun Japanese Grammar Checker extension ("the Service").

We've designed our Service with privacy as a priority. Your trust is important to us, and we want you to understand exactly how we handle your data.

Key Privacy Points

  • Zero Storage of Processed Text: We do not store any of the text you check. Your writing is processed in real-time and immediately discarded. We retain no text data on anyone, at any time.
  • No AI Training, Ever: We do not use your text — or any user data — to train AI models, under any circumstances. This is a firm policy, not a configuration option.
  • Encrypted in Transit: All data transmitted between your browser and our servers is encrypted using industry-standard TLS/SSL protocols.
  • No Keystroke Recording: We do not track or record your keystrokes or monitor your typing behavior.
  • Minimal Data Collection: We only collect the information necessary to provide you with our service and improve your experience.

Information We Collect

Account Information

When you create an account, we collect basic information such as your email address and name. This information is used to manage your account and provide you with our services.

Usage Data

We collect anonymous usage statistics to help us improve our service, such as:

  • Number of grammar checks performed
  • Types of errors detected (without storing the actual text)
  • Feature usage patterns
  • General geographic location (country level only)

Text Processing

Important: When you use our grammar checking service, your text is:

  • Transmitted securely using TLS/SSL encryption
  • Processed in real-time on our servers located in the United States
  • Never stored or saved after processing
  • Never used to train AI models, under any circumstances

How We Use Your Information

We use the information we collect to:

  • Provide, maintain, and improve our Service
  • Manage your account
  • Send you important service updates and administrative messages
  • Analyze usage patterns to enhance our features and performance
  • Detect and prevent fraud and abuse of our Service

Data Security

We take data security seriously and implement multiple measures to protect your information:

  • Encrypted in Transit: All data transmitted between your browser and our servers is encrypted using industry-standard TLS/SSL protocols.
  • Secure Infrastructure: Our services run on secure cloud infrastructure with regular security updates and monitoring.
  • Ephemeral Processing: Your text is processed in memory and never written to persistent storage.
  • Access Controls: Strict access controls limit who can access our systems and under what circumstances.
  • Security Assessments: We conduct regular security assessments and vulnerability testing.

Cookies and Local Storage

Our extension uses browser cookies and local storage for essential functions such as keeping you logged in and remembering your preferences. We do not use tracking cookies for advertising purposes.

Third-Party Services

We use the following third-party services to provide our Service:

  • Firebase Authentication: For secure authentication and user management.
  • Stripe: For secure payment processing.
  • AWS: For secure, scalable cloud infrastructure.

These services have their own privacy policies and may collect certain information as described in their respective privacy policies.

Browser Extension Permissions

Our browser extension requires certain permissions to function properly:

  • Access to current tab: Required to check text on the pages you visit.
  • Storage: Used to store your preferences and authentication information locally.

We request only the minimum permissions necessary to provide our service. The extension does not have permission to access your browsing history, collect data from any other tabs, or access any website data unrelated to the grammar checking functionality.

Your Rights

Depending on your location, you may have certain rights regarding your personal information:

  • The right to access your personal information
  • The right to correct inaccurate information
  • The right to delete your personal information
  • The right to restrict or object to processing
  • The right to data portability

To exercise these rights, please contact us using the information provided at the end of this policy.

Children's Privacy

Our Service is not intended for children under the age of 13. We do not knowingly collect personal information from children under 13.

International Data Transfers

Our servers are located in the United States. If you access our Service from outside the United States, please be aware that your information may be transferred to, stored, and processed in the United States.

Changes to This Privacy Policy

We may update our Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last Updated" date.

We encourage you to review this Privacy Policy periodically for any changes.

Contact Us

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

Email: kunkun@kunkun.io