Onja Terms of Service
Article 1 (Definitions)
1. In these Terms of Service (hereinafter “these Terms”), the following terms shall have the meanings set forth below:
(1) “Service” means the AI vocabulary learning application “Onja” provided by Onja (hereinafter “we,” “us,” or “our”), as well as all related applications, websites, software, content, features, and any other services provided in connection therewith.
(2) “User” means any individual who agrees to these Terms and uses the Service.
(3) “Account” means the email address, authentication credentials, user identification information, and related access rights registered by a User to use the Service.
(4) “Input Data” means all words, sentences, phrases, meanings, scene settings, and other information that Users enter, submit, or register in the Service.
(5) “AI-Generated Content” means sentences, stories, translations, audio, word descriptions, pronunciation information, and other outputs generated by AI technology based on Input Data.
(6) “User Content” means images, playlist cover images, Input Data, and any other data uploaded, posted, or stored by a User in the Service.
(7) “Subscription” means a contractual arrangement under which the Service is used on a continuing basis in exchange for a monthly or annual fee.
(8) “Credits” means usage points consumed when using AI generation processing and other functions designated by us within the Service.
2. Terms not defined herein shall be interpreted in accordance with applicable laws and regulations or their general usage.
3. These Terms shall apply to all relationships between us and Users concerning use of the Service.
Article 2 (Agreement to Terms)
1. Users shall thoroughly understand the contents of these Terms and agree to all provisions before using the Service.
2. If a User downloads the Service, registers an Account, or actually uses the Service, the User is deemed to have agreed to all provisions of these Terms.
3. The Service is intended primarily for individuals aged 18 and older.
4. We may amend these Terms pursuant to Article 548-4 of the Civil Code in the following cases:
(1) When the amendment serves the general interests of Users; or
(2) When the amendment is not contrary to the purpose of the agreement and is reasonable in light of the necessity for the change, the reasonableness of the amended content, and other circumstances relating to the amendment.
5. When amending these Terms, we will notify Users in advance of the content of the amended Terms and the effective date by posting on the Service or by other means we deem appropriate.
6. Amended Terms shall take effect from the effective date designated by us.
Article 3 (Service Description)
1. The Service is an application that uses AI technology to support vocabulary learning, aiming to provide vocabulary learning experiences through text and audio by having AI generate stories based on words, phrases, sentences, scene settings, and other information entered by Users.
2. The Service primarily provides the following features:
(1) AI story generation
(2) AI translation
(3) AI word explanation and definition generation
(4) AI audio generation and text-to-speech
(5) Word management and vocabulary learning history management
(6) Generated story saving and library features
(7) Playlist creation and playback
3. The AI features of the Service may be provided using third-party AI services (including, but not limited to, AI services provided by Google).
4. Some features of the Service may be provided using cloud services, access analysis tools, payment services, and other third-party services.
5. We may change, add, or discontinue the content of the Service when technically or operationally necessary, regardless of whether prior notice is given to Users.
Article 4 (Registration)
1. Those wishing to use the Service shall agree to these Terms and apply for registration by registering their email address and other information designated by us in the manner prescribed by us.
2. Upon reviewing and approving the application in the preceding paragraph, we will create an Account for the applicant, and a Service use agreement between us and the User shall be formed at that time.
3. Users shall provide their email address, nickname, and other information designated by us as registration information, and shall manage such information at their own responsibility to ensure it remains true, accurate, and up to date.
4. Users shall properly manage their Account information and passwords at their own responsibility, and shall not allow any third party to use them, or lend, transfer, change the name of, or otherwise dispose of them.
5. We shall not be responsible for any damages incurred by Users due to inadequate management of Account information, errors in use, or unauthorized use by third parties.
6. If we determine that a User falls under any of the following, we may, without prior notice or demand, refuse registration, suspend or delete the Account, or take other measures we deem necessary:
(1) The registration information contains false or inaccurate content;
(2) The User has violated these Terms;
(3) We determine that the User belongs to antisocial forces; or
(4) We otherwise determine that registration is inappropriate.
Article 5 (Fees)
1. The Service is a paid service provided on a monthly or annual subscription basis. Users shall pay the usage fees separately designated by us.
2. Users shall pay for the Service through in-app purchases (In-App Purchase) via the Apple App Store provided by Apple Inc., and such payments shall be processed in accordance with the terms and payment policies set by Apple.
3. Subscriptions will automatically renew in accordance with Apple’s rules, and Users wishing to stop renewal shall cancel through the Apple App Store account settings or other methods designated by Apple.
4. Apple’s terms and policies shall apply to all payment processing, billing, refunds, cancellations, and other billing matters for the Service, and we shall not be directly involved in such billing matters.
5. We may change the fees or fee structure due to changes in the Service content, operational necessity, or changes in economic conditions. In such cases, the changed fees shall apply from the time designated by us.
6. Fees paid by Users are generally non-refundable, except as required by law or as permitted by Apple’s policies.
Article 6 (Credits)
1. When using AI generation features and other features designated by us in the Service, a number of Credits designated by us may be consumed. Credits are internal usage points for using features provided within the Service and have no monetary value.
2. Credits shall be granted in quantities designated by us at regular intervals in accordance with the content of the Subscription contracted by the User.
3. Credits are generally reset on a monthly basis, and Credits unused within the period shall not be carried over to the following period.
4. In the event of communication errors, AI generation processing failures, or other circumstances that we reasonably determine to constitute a processing failure, Credits shall not be consumed for such processing.
5. Credits are associated with the User’s Account and may not be transferred to, lent to, shared with, or exchanged for cash by third parties.
6. We may change the number of Credits granted, conditions for consumption, scope of use, and other conditions as we deem necessary for Service operations.
7. Credits once consumed shall not be returned or refunded for any reason; provided, however, that this shall not apply if we reasonably determine that Credits were consumed due to a system malfunction or error.
Article 7 (AI Features and Generated Content)
1. The Service provides features that use AI technology to generate text, translations, audio, and other content (hereinafter “AI-Generated Content”) based on Input Data such as words, sentences, phrases, meanings, or scene settings entered by Users.
2. AI-Generated Content is provided through automatic generation by machine learning models and, by its nature, may contain errors, inaccurate translations, contextual inconsistencies, inappropriate expressions, pronunciation errors, and other imperfections.
3. We make no warranties, express or implied, regarding the accuracy, completeness, usefulness, reliability, fitness for a particular purpose, legality, or non-infringement of third-party rights of AI-Generated Content.
4. Users shall determine at their own responsibility whether to use AI-Generated Content, and we shall not be liable for any results arising from the use of such content.
5. The AI features of the Service may be provided using third-party AI services or the technology infrastructure of third parties used by us.
6. We may use Users’ Input Data and AI-Generated Content for the purpose of improving Service quality, enhancing features, or investigating defects. However, we shall not use Users’ Input Data or AI-Generated Content for training machine learning models or AI models (i.e., use as training data).
7. Audio data generated within the Service (including AI text-to-speech audio) may be provided as a feature available during the Subscription term. If a User resumes use of the Service after terminating their Subscription, such audio data may not be saved or reused and may need to be regenerated.
Article 8 (User Content)
1. Users may upload or register playlist cover images and other images, information, or data (hereinafter “User Content”) in the Service.
2. Users represent and warrant that they hold all rights and authority necessary to post or upload User Content and that such content does not infringe the copyrights, trademarks, portrait rights, privacy rights, or other rights of any third party.
3. If any dispute or claim arises with a third party regarding User Content, Users shall resolve it at their own responsibility and expense, and shall compensate us for any resulting damages.
4. Users grant us a royalty-free license to use (including reproducing, storing, displaying, and other necessary uses) User Content to the extent necessary for the purpose of providing, operating, improving, and promoting the Service.
5. We may delete or hide User Content if it violates these Terms or we otherwise determine it to be inappropriate.
Article 9 (Prohibited Conduct)
1. Users shall not engage in any of the following conduct when using the Service:
(1) Any act in violation of laws, regulations, or public order and morals;
(2) Criminal acts or acts related to criminal conduct;
(3) Registering or providing false or inaccurate information;
(4) Acts that infringe on the copyrights, trademark rights, privacy rights, portrait rights, or other rights of third parties;
(5) Acts that interfere with the operation of the Service or impose excessive loads on our systems;
(6) Unauthorized access to or attempts to access the Service, our servers, networks, or other systems;
(7) Reverse engineering, decompiling, or analyzing the software or systems of the Service;
(8) Sending large volumes of requests using bots, scripts, or other automated means;
(9) Illegally using another person’s Account or logging in without authorization;
(10) Attempting to generate violent, sexual, discriminatory, or other inappropriate content;
(11) Sending or spreading computer viruses, malware, or other harmful programs;
(12) Acts relating to involvement with or provision of benefits to antisocial forces;
(13) Using the Service for improper purposes or by inappropriate means; or
(14) Any other conduct that we determine to be inappropriate.
Article 10 (Response to Violations)
1. If a User violates these Terms, or if we reasonably determine there is a risk thereof, we may, without prior notice or demand, take the following measures or other measures we deem necessary:
(1) Warning;
(2) Deletion or hiding of User Content;
(3) Suspension of all or part of use of the Service;
(4) Suspension or deletion of Account; or
(5) Termination of the Service use agreement.
2. We shall be under no obligation to explain to Users the reasons for the measures taken under the preceding paragraph.
3. We shall not be liable for any damages incurred by Users as a result of measures taken under this Article.
4. If we suffer damages as a result of a User’s violation of these Terms, the User shall compensate us for such damages.
Article 11 (Suspension of Service)
1. We may suspend or interrupt the provision of all or part of the Service, regardless of whether prior notice is given to Users, in any of the following cases:
(1) When performing system maintenance, inspection, or updates;
(2) When provision of the Service becomes difficult due to communication line or server failures;
(3) When a security issue arises such as a cyberattack or unauthorized access;
(4) When provision of the Service becomes difficult due to earthquakes, power outages, fires, natural disasters, or other force majeure events; or
(5) When we otherwise determine that suspension or interruption is necessary for the operation of the Service.
2. We shall not be liable for any damages incurred by Users as a result of suspension or interruption of the Service under the preceding paragraph.
Article 12 (Termination of Service)
1. We may terminate all or part of the Service at our discretion for technical, operational, or other reasons.
2. When terminating the Service, we will notify Users within a reasonable period by posting on the Service or by other means we deem appropriate.
3. Upon termination of the Service, the Service use agreement between Users and us regarding the Service shall also terminate.
4. We shall not be liable for any damages incurred by Users as a result of the termination of the Service.
Article 13 (Handling of Personal Information)
1. We shall comply with the Act on the Protection of Personal Information and other applicable laws and guidelines, and shall appropriately acquire, use, and manage Users’ personal information obtained in connection with the provision of the Service in accordance with our separately established Privacy Policy.
2. We shall use the acquired personal information for the following purposes:
(1) For the provision, operation, and maintenance of the Service;
(2) For user authentication, Account management, and identity verification;
(3) For responding to inquiries from Users and providing support;
(4) For preventing and responding to unauthorized use, unauthorized access, and other improper acts;
(5) For improving Service quality, enhancing features, and developing new features;
(6) For analyzing Service usage and creating statistical data;
(7) For providing important notices, notifying changes to terms of use, and other necessary notifications; and
(8) For purposes incidental to the foregoing.
3. The Service may use access analysis tools, crash analysis tools, and other third-party services for the purpose of improving Service quality and analyzing usage.
4. We may store or process user information and user data on cloud services and other third-party services (including, but not limited to, Google Cloud Platform and Firebase) to the extent necessary for providing and operating the Service.
5. We may entrust all or part of the handling of personal information to third parties to the extent necessary for Service operations, and in such cases, we shall appropriately supervise the entrusted party.
6. Except as required by law, we shall not provide personal information to third parties without the User’s consent.
7. We may use or publish acquired information as statistical information processed in a form that does not identify individuals.
8. For matters relating to the handling of personal information not addressed in this Article, our Privacy Policy shall apply.
Article 14 (Disclaimer)
1. We make no warranties, express or implied, regarding the Service and any information, content, features, or other elements provided through the Service, including their completeness, accuracy, usefulness, legality, safety, reliability, continuity, fitness for a particular purpose, or any other matters.
2. The Service provides features that generate content using AI technology; however, AI-Generated Content is automatically generated by machine learning models and may, by its nature, contain errors, inaccurate translations, incomplete expressions, inappropriate content, and other imperfections. We do not warrant the accuracy, reliability, legality, or non-infringement of third-party rights of AI-Generated Content.
3. Users shall determine at their own responsibility whether to use the Service and AI-Generated Content, and we shall not be liable for any results arising from the use of the Service or AI-Generated Content.
4. The Service may be provided using communication lines, cloud services, third-party AI services, and other third-party services. We shall not be liable for any damages incurred by Users if all or part of the Service becomes unavailable due to suspension, failure, changes, or termination of such third-party services.
5. We shall not be liable for any damages incurred by Users if the provision of the Service is delayed, interrupted, or discontinued due to communication failures, system failures, server downtime, cyberattacks, unauthorized access, power outages, natural disasters, or other events beyond our reasonable control.
6. We do not guarantee the storage, backup, or recovery of user data, AI-Generated Content, and other data stored in the Service, and shall not be liable for any damages incurred by Users due to loss, corruption, or alteration of data.
7. We shall not be liable for any disputes, troubles, or damages arising between Users and third parties in connection with Users’ use of the Service.
8. The provisions of this Article shall not apply in cases where we have acted with intent or gross negligence.
Article 15 (Damages)
1. If a User causes damages to us or a third party in connection with a violation of these Terms or use of the Service, the User shall be liable to compensate for all such damages (including reasonable attorney’s fees).
2. If any dispute, claim, or demand arises between a User and a third party in connection with use of the Service, the User shall resolve it at their own responsibility and expense, and shall compensate us for any resulting damages.
3. Even if we bear liability for damages to a User in connection with the use of the Service, our liability shall be limited to the total amount of usage fees paid by the User to us during the most recent 12-month period.
4. Except in cases where we have acted with intent or gross negligence, we shall not be liable for indirect damages, special damages, incidental damages, consequential damages, lost profits, loss of business opportunities, or similar damages incurred by Users in connection with the use or inability to use the Service.
5. The limitations on liability in this Article shall apply regardless of the legal theory, including contractual liability, tort liability, or otherwise.
Article 16 (Exclusion of Antisocial Forces)
1. Users represent and warrant that they do not currently and will not in the future fall under any of the following categories:
(1) Organized crime groups (boryokudan);
(2) Members of organized crime groups or persons who have not been non-members for less than five years;
(3) Associate members of organized crime groups;
(4) Companies affiliated with organized crime groups;
(5) Corporate racketeers (sokaiya), groups engaging in criminal activities under the guise of social movements, or special intelligence criminal organizations; or
(6) Other antisocial forces equivalent to the foregoing.
2. Users warrant that they will not, themselves or through third parties, engage in any of the following acts:
(1) Violent demands;
(2) Unreasonable demands beyond legal liability;
(3) Threatening language or violent acts in connection with transactions;
(4) Acts that damage our reputation or obstruct our business through spreading rumors, fraudulent means, or force; or
(5) Other acts equivalent to the foregoing.
3. Users shall not provide funds, benefits, or similar acts to antisocial forces.
4. If we reasonably determine that a User has violated this Article, we may immediately suspend or delete the User’s Account and terminate the Service use agreement without any demand.
5. We shall not be liable for any damages incurred by Users as a result of measures taken under the preceding paragraph.
6. If we suffer damages as a result of a User’s violation of this Article, the User shall compensate us for such damages.
Article 17 (Governing Law and Jurisdiction)
1. The formation, validity, interpretation, and performance of these Terms and all matters relating to use of the Service shall be governed by the laws of Japan.
2. For any disputes, claims, or questions arising between us and Users relating to the Service or these Terms, the district court or summary court having jurisdiction over our location shall be the court of exclusive jurisdiction in the first instance, depending on the amount in controversy.
3. In the event of any doubt or dispute between us and a User regarding the Service or these Terms, we and the User shall endeavor to resolve the matter through good-faith discussions.
Supplementary Provisions
Effective Date: March 15, 2026