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Terms of Use – Chat AI

Effective Date: December 12, 2025

These Terms of Use (the “Terms”) govern the use of the application “Chat AI” (the “App”) provided by masaki matsushita, based in Tokyo, Japan (“we”, “us” or “our”). By installing or using the App, you (“you” or “user”) agree to be bound by these Terms.

Article 1 (Definitions)

In these Terms:

  1. “User Input” means text, prompts, and any other content you submit or enter in the App.

  2. “Third-Party AI Providers” means external AI service providers whose APIs may be used to generate AI responses, including OpenAI, Inc. (“OpenAI”) and xAI (“xAI”) (Grok API).

  3. “AI Responses” means outputs generated automatically through the Third-Party AI Providers’ APIs based on User Input and related context.

Article 2 (Overview of the App)

  1. The App is a chat service that uses APIs provided by Third-Party AI Providers (including OpenAI and/or xAI) to automatically generate AI Responses to User Input.

  2. The App can be used without user registration or login.

  3. We do not store users’ conversation history on servers managed by us. Conversation history may be stored only locally on the user’s device.

  4. In order to generate AI Responses, the App may transmit User Input (and necessary context) to Third-Party AI Providers. Details of data handling are described in our Privacy Policy.

  5. Consent for transmission to Third-Party AI Providers: By using AI-related features of the App (and/or providing opt-in consent within the App where presented), you consent to the transmission of User Input to Third-Party AI Providers for the purpose of generating AI Responses. If you withdraw such consent or disable a provider (where available), some features may not function or may be limited.

Article 3 (Scope and Amendment of the Terms)

  1. These Terms apply to all relationships between you and us in connection with the use of the App.

  2. We may, at our sole discretion, change these Terms at any time without prior notice to users. The revised Terms will become effective when they are displayed within the App or on a website designated by us. If you continue to use the App after the revised Terms become effective, you will be deemed to have agreed to the revised Terms.

Article 4 (Intellectual Property Rights)

  1. All intellectual property rights in and to the App, including but not limited to programs, images, text, UI design, and any other content, belong to us or third parties who have granted us the necessary rights.

  2. You shall not reproduce, transfer, lend, adapt, publicly transmit, reverse engineer, or otherwise use such content beyond the scope permitted by law without our prior written consent.

  3. The rights to User Input remain with you. However, you grant us a non-exclusive, worldwide, royalty-free license to use, reproduce, process, and transmit User Input to the extent necessary for providing, operating, maintaining, securing, and improving the App (including transmitting User Input to Third-Party AI Providers to generate AI Responses).

  4. You represent and warrant that you have all necessary rights to submit User Input and that such User Input does not violate any applicable laws or infringe any third-party rights.

Article 5 (Prohibited Acts)

You shall not engage in any of the following acts when using the App:

  1. Acts that violate laws and regulations or public order and morals

  2. Criminal acts, or acts that encourage or facilitate criminal acts

  3. Acts that infringe or may infringe the rights or interests of third parties, including but not limited to copyrights, portrait rights, privacy, and reputation

  4. Using the App in a manner that violates any Third-Party AI Provider’s terms of use, policies, or content guidelines (including OpenAI’s and xAI’s policies)

  5. Acts that place an excessive load on the App’s infrastructure, or that interfere with or may interfere with the operation of the App, our systems, or networks

  6. Reverse engineering, decompiling, disassembling, or otherwise attempting to analyze the source code of the App

  7. Using the App to send spam, conduct unauthorized access, distribute malware, or engage in any similar malicious activities

  8. Submitting User Input that is unlawful, harmful, or intended to exploit, harass, or harm others

  9. Any other acts that we deem inappropriate

Article 6 (Notice Regarding AI Responses)

  1. AI Responses in the App are automatically generated by AI via Third-Party AI Providers’ APIs. We make no guarantees whatsoever as to the accuracy, completeness, usefulness, legality, or timeliness of such AI Responses.

  2. You shall not use information obtained from the App as a substitute for professional advice in fields such as medicine, law, investment, tax, or any other specialized area. When making important decisions, you should always consult a qualified professional.

  3. You agree that any actions you take and any results arising from the use of AI Responses are solely your own responsibility, and we shall not be liable for any damages arising from such use.

Article 7 (Paid Features and Subscriptions)

  1. The App includes certain paid features and subscription plans.

  2. The fees, payment methods, billing timing, availability of free trials, and other terms of the paid features are as indicated within the App or on the App Store page.

  3. Subscriptions are managed through the App Store. Cancellation of a subscription must be carried out by the user via the App Store subscription management screen. Subscriptions cannot be canceled from within the App.

  4. Even if you delete the App from your device, your subscription will not be automatically canceled. You are responsible for canceling your subscription yourself via the App Store.

Article 8 (Age Restriction)

  1. The App is intended only for users who are 18 years of age or older.

  2. By using the App, you represent and warrant that you are at least 18 years old. If we reasonably believe that you are under 18, we may restrict or terminate your use of the App.

Article 9 (Modification, Suspension, and Termination of the Service)

  1. We may change, suspend, or terminate all or part of the App without prior notice to users in the following cases, among others:

    • System maintenance or updates

    • System failures or other technical issues

    • Natural disasters or other force majeure events

    • Changes to, or suspension/termination of, external services such as OpenAI’s API and/or xAI’s Grok API

    • Any other circumstances under which we deem such actions necessary

  2. We shall not be liable for any damages incurred by users or third parties as a result of changes, suspension, or termination of the App in accordance with this Article.

Article 10 (Disclaimer of Warranties and Limitation of Liability)

  1. We do not warrant that the App will always operate properly, be free from errors or defects, or meet the specific purposes of users.

  2. We shall not be liable for any damages arising from the inability to use the App due to communication environment issues, server failures, Third-Party AI Providers’ service failures or specification changes, or any other reasons.

  3. Even if users or third parties suffer damages as a result of the use or inability to use the App, or based on AI Responses or other information obtained through the App, we shall not be liable for any such damages, except in cases of willful misconduct or gross negligence on our part.

  4. To the maximum extent permitted by applicable law, our total liability for any claims relating to the App shall, in any event, be limited to the total amount of fees actually paid by the user to us in connection with the App during the three (3) months immediately preceding the date on which the claim arose.

Article 11 (Governing Law and Jurisdiction)

These Terms shall be governed by and construed in accordance with the laws of Japan. Any disputes arising out of or in connection with the App or these Terms shall be submitted to the exclusive jurisdiction of the Tokyo District Court in Japan as the court of first instance.

Article 12 (Contact)

If you have any questions about these Terms, please contact:
masaki matsushita
Email: masaki030515@gmail.com

End of Terms of Use

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