Terms of Service

Last Updated: April 10, 2026

1. Introduction

Welcome to Kunkun. These Terms of Service ("Terms") govern your use of the Kunkun Japanese grammar checking browser extension and related services (collectively, the "Service") operated by Kunkun ("we," "us," or "our").

By accessing or using the Service, you agree to be bound by these Terms. If you disagree with any part of the Terms, you may not access the Service.

2. Service Description

Kunkun provides an AI-powered Japanese grammar checking service designed to identify grammar errors, suggest corrections, and provide language learning assistance. The Service is available as a browser extension that integrates with websites you visit.

While we strive for accuracy and quality, the Service is not a substitute for professional proofreading or translation services.

3. User Accounts

To access certain features of the Service, you must create an account. When you create an account, you must provide accurate and complete information. You are solely responsible for:

  • Maintaining the confidentiality of your account credentials
  • All activities that occur under your account
  • Notifying us immediately of any unauthorized use of your account

We reserve the right to disable any user account if, in our opinion, you have violated any provision of these Terms.

4. Service Access

Kunkun is currently provided free of charge. We may introduce optional paid plans in the future, and we will provide advance notice of any such changes. Your continued use of the Service after any pricing changes take effect constitutes acceptance of the new terms.

5. Intellectual Property

5.1 Your Content

You retain all rights to the text and content you check using our Service. We do not claim ownership over your content and we do not store your text after processing.

By using the Service, you grant us a limited, non-exclusive, royalty-free license to process and analyze your text solely for the purpose of providing the grammar checking service to you. This license expires immediately after the text is processed.

5.2 Our Content

The Service, including its features, functionality, design, and underlying technology, is owned by us and is protected by copyright, trademark, and other intellectual property laws.

You may not:

  • Copy, modify, or distribute our Service or content
  • Reverse engineer or attempt to extract our code or algorithms
  • Remove any copyright, trademark, or other proprietary notices
  • Use our Service for any commercial purpose without our permission

6. Acceptable Use

You agree not to use the Service to:

  • Violate any applicable laws or regulations
  • Infringe upon the rights of others
  • Transmit content that is unlawful, harmful, threatening, abusive, harassing, defamatory, vulgar, obscene, or otherwise objectionable
  • Attempt to interfere with, compromise, or disrupt the Service
  • Attempt to gain unauthorized access to any part of the Service
  • Use automated systems or software to extract data from the Service (scraping)

7. Educational Use

Our Service is designed to help users learn and improve their Japanese writing skills. When using the Service in academic or educational settings:

  • Comply with your institution's academic integrity policies
  • Use the Service as a learning tool, not a substitute for learning the material
  • Acknowledge the use of our Service if required by your institution's policies

We are not responsible for any academic consequences resulting from the use or misuse of our Service.

8. Disclaimers and Limitations

8.1 Service Accuracy

While we strive for accuracy, our Service:

  • Is not guaranteed to be 100% accurate or error-free
  • May not catch all grammar errors or may occasionally suggest incorrect corrections
  • Is not a substitute for professional translation, editing, or proofreading services
  • May work better for certain types of Japanese text than others

You are responsible for reviewing and evaluating the suggestions provided.

8.2 General Disclaimer

THE SERVICE IS PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.

WE DO NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED OR ERROR-FREE, THAT DEFECTS WILL BE CORRECTED, OR THAT THE SERVICE OR THE SERVERS THAT MAKE IT AVAILABLE ARE FREE OF VIRUSES OR OTHER HARMFUL COMPONENTS.

8.3 Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, IN NO EVENT SHALL WE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF PROFITS, GOODWILL, USE, DATA, OR OTHER INTANGIBLE LOSSES (EVEN IF WE HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES), RESULTING FROM:

  • YOUR USE OR INABILITY TO USE THE SERVICE
  • ANY CHANGES MADE TO THE SERVICE
  • UNAUTHORIZED ACCESS TO OR ALTERATION OF YOUR TRANSMISSIONS OR DATA
  • STATEMENTS OR CONDUCT OF ANY THIRD PARTY ON THE SERVICE
  • RELIANCE ON GRAMMAR OR LANGUAGE SUGGESTIONS PROVIDED BY THE SERVICE
  • ANY OTHER MATTER RELATING TO THE SERVICE

9. Termination

We may terminate or suspend your account and access to the Service immediately, without prior notice or liability, for any reason, including but not limited to a breach of these Terms.

Upon termination, your right to use the Service will immediately cease. If you wish to terminate your account, you may contact us to request account deletion.

10. Changes to Terms

We reserve the right to modify or replace these Terms at any time. If a revision is material, we will provide at least 30 days' notice prior to any new terms taking effect by posting a notice on our website or by sending you an email.

By continuing to access or use our Service after those revisions become effective, you agree to be bound by the revised Terms. If you do not agree to the new Terms, you may stop using the Service.

11. Governing Law and Dispute Resolution

These Terms shall be governed by and construed in accordance with the laws of the State of California, United States, without regard to its conflict of law provisions.

Any dispute arising from or relating to the subject matter of these Terms shall be finally settled by binding arbitration conducted remotely, using the English language in accordance with the rules and procedures of the American Arbitration Association.

Any judgment on the award rendered by the arbitrator may be entered in any court of competent jurisdiction. You agree that any arbitration shall be limited to the dispute between us individually. Class action arbitrations and class actions are not permitted.

The foregoing arbitration provisions shall apply only to the extent permitted by the consumer protection laws of your country of residence.

12. Contact Us

If you have any questions about these Terms, please contact us at:

Email: kunkun@kunkun.io