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AIR MATH Terms of Use
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Terms of Use

Effective Date: January 21, 2022

These Terms of use(“Terms of Use”) are a binding contract between you and Riiid, Inc(“Riiid” ). By using the Service, you agree to the Terms of Use. All applicable laws and regulations, and agree that you are responsible for compliance with any applicable local laws.  If you do not agree with any of these terms, you are prohibited from using the service or accessing this site. Terms of Use will govern your use of Riiid’s websites, mobile apps, applications and other features or services.

Riiid may elect to change or supplement the Terms of Use from time to time at its sole discretion. You agree that we may notify you of the Updated Terms by posting them on the site so that they are accessible via a link on the home page, and that your use of our Service after we have posted the Updated Terms (or engaging in such other conduct as we may reasonably specify), you agree to be bound by the then-current version of the Terms of Use, including any changes we may have made since the last time you used our Service.

If you do not agree with the changes, you should discontinue using the Service. If you continue using the Service after such changes, you will be deemed to have accepted the changes to the Terms of Use. Changes to the Terms of Use will be effective as of the time of posting, or such later date as may be specified in the updated Terms of Use, and will apply to your use of the Service from that point forward.

Riiid reserves the right, in Riiid’s sole discretion, to make changes to or discontinue any of the Service at any time. Any description of the Service provided by Riiid is not a representation that the Service is working or will always work in that manner, as Riiid is continuously updating the Service.

1. Eligibility; User Accounts

You affirm that you are at least 13 years of age and are otherwise fully able and competent to enter into the terms, conditions, obligations, affirmations, representations, and warranties set forth in Terms of Use, and to abide by and comply with these Terms of Use. Your access may be terminated without warning if Riiid believes that you are under the age of 13 or are otherwise ineligible.

2. Registration Data / Account Security

You may only have one account for use of the Service. You may not create or use more than one account, and you may not share your account or any of the Service with others.

All information you provide to create an account must be accurate and complete. You may not impersonate any other person or use a name that is not your own. You represent and warrant that you will use the Service in compliance with any and all applicable laws and regulations. It is your responsibility to update your account information to keep it current and accurate.

You are solely responsible for maintaining the confidentiality of your information, and for any and all use of your account. You agree not to use the account, username, or password of another user at any time, nor to disclose your password to any third-party. You agree you will not sell or share or otherwise transfer your membership or any membership rights.

You agree to notify Riiid immediately if you suspect any unauthorized use of your account or access to your password.

3. Intellectual Property

These Terms of Use confer only the right to use the Service, while these Terms and the specified licenses are in effect, and they do not convey any rights of ownership in or to the Service. All right, title and interest, including without limitation any copyrights, patents, trade secrets and other intellectual property rights in the Service will remain Riiid’s sole property. Any Service provided to you under these Terms, and other data or materials that are prepared in the performance of such services hereunder, and all right, title and interest in the foregoing, will belong to Riiid or to third parties. Riiid reserves all rights not expressly granted in these Terms.

You agree that the Service contains proprietary content, information and material that is protected by applicable intellectual property and other laws, including but not limited to copyright, and that you will not use such proprietary content, information or materials in any way whatsoever except for permitted use of the Service. No portion of the Service may be reproduced in any form or by any means.

4. Use License

Subject to your compliance with these Terms of Use, Riiid grants you a limited, personal, non-exclusive, non-commercial, revocable and non-transferable license to view Riiid’s content. This is the grant of a license, not a transfer of title, and under this license you may not:

Riiid will automatically terminate the license if you violate any of these restrictions at any time. Upon terminating your access to these materials, or upon the termination of this license, you must destroy any downloaded materials in your possession whether in electronic or printed format.

5. Proprietary Rights

Unless otherwise explicitly specified by Riiid, all materials that are included in or otherwise a part of the Services, including past, present, and future versions, domain names, source and object code, the text, site and app design, logos, graphics, and icons, as well as the selection, assembly and arrangement thereof and the "look and feel" of the Services, are owned, controlled, or licensed by Riiid.

6. User Content

When you use the Service, you may generate User Content. “User Content” means any content created by you, such as math problems, photographs, pictures, data and information, or other content that you submit or is automatically submitted in the Service. In particular, the photographs and videos of math problems that you may submit to the Service, or automatically submitted photographs and videos of math problems that are automatically collected when you use the service, are User Content. You are solely responsible for your User Content, including complying with all laws applicable to your User Content. You agree not to submit to the Service any defamatory, inaccurate, abusive, obscene, profane, offensive, sexually oriented, threatening, harassing, racially offensive, or illegal User Content, or any User Content that infringes or violates another party's rights (including, but not limited to, intellectual property rights, and rights of privacy and publicity).

You hereby grant, and you represent and warrant that you have the right to grant, to Riiid a perpetual, irrevocable, non-exclusive, worldwide, transferable, royalty-free and fully paid right and license, with the right to sublicense, to reproduce, distribute, transmit, publicly perform, publicly display, digitally perform, modify, create derivative works of Riiid may only use such license ion order to operate, promote and improve the Service.

In particular and without limiting the generality of the foregoing, please note that any photographs and videos you submit to the Service, or photographs and videos submitted automatically to the Service by using the Service, or otherwise submit to Riiid (such as photographs and videos of math problems) constitute User Content and by submitting them you grant Riiid the right and license set forth above and give the representations and warranties set forth below.

You represent and warrant that:

•You own, or have the necessary licenses, rights, and/or consents to submit your User Content in the Service;

•Your User Content, and Riiid’s exercise of rights as stated in these Terms of Use, do not and will not violate, misappropriate or infringe any intellectual property right or other right of any third party, including but not limited to trademark rights, copyrights, moral rights and publicity rights of any third party;

•You possess all rights necessary for the reproduction, distribution, transmission, public performance, public display, and other exploitation of your User Content by Riiid as permitted in these Terms of Use; and

•Your User Content is not pornographic, obscene, libelous, defamatory, tortious, harassing or otherwise unlawful.

Examples of Prohibited User Content

The following types of User Content are examples of User Content that is prohibited in the Service:

Riiid has no responsibility for the conduct of any user in the Service, including any User Content submitted in the Service. Riiid assumes no responsibility for monitoring the Service for inappropriate content or conduct. Your use of the Service is at your own risk.

If you see any material in the Service that in your good faith belief is offensive, hateful, harassing or that you otherwise think is prohibited, you may notify Riiid by contacting at

For instructions on how to report intellectual property issues, please see Copyright Infringement Section below.

User Submissions

You acknowledge and agree that any questions, comments, suggestions, ideas, feedback, bug reports or other information about the Service (“Submissions'') provided by you are non-confidential and shall become Riiid’s sole property and you assign all rights in these Submissions to Riiid. Riiid shall own exclusive rights, including all intellectual property rights, and shall be entitled to the unrestricted use and dissemination of these Submissions for any purpose, commercial or otherwise, without acknowledgment or compensation to you.

7. Copyright Infringement

Riiid undertakes to obey relevant copyright laws. If you believe copyright-protected work was posted on the Service without authorization, you may submit a copyright infringement notification. Riiid will review all claims of copyright infringement received and remove User Content deemed to have been posted or distributed in violation of any such laws. To make a claim, please provide Riiid with the following:

  1. the name and contact information of the copyright holder or his/her representative who is making the notification (the “Notifying Party”);
  2. an itemization of the material, for which prevention of access is requested, and details of the location of the material. Please provide enough detail for Riiid to locate the allegedly infringing content on the Service;
  3. confirmation by the Notifying Party that the material which the request concerns is, in its sincere opinion, illegally accessible in the communications network;
  4. information concerning the fact that the Notifying Party has in vain submitted its request to the content provider or that the content provider could not be identified;
  5. confirmation by the Notifying Party that he/she is the holder of copyright or neighboring right or entitled to act on behalf of the holder of the right;
  6. signature of the Notifying Party.

Claims can be sent to

8. Account Cancellation

You may request cancellation of your account at any time throughout your use of Services. All provisions of Terms of Use which by their nature should survive, shall survive termination of Services, including without limitation, use license, User Content, warranties and disclaimers, and limitation of liability.

9. Electronic Communications

When you use this Service and when you communicate with Riiid electronically, for example by sending Riiid an email or ordering Riiid’s products online, you consent to receive communications from Riiid electronically. Riiid will communicate with you by email or by posting notices on this website. You agree that all agreements, notices, disclosures, and other communications that Riiid provide to you electronically satisfy any legal requirement that such communications be in writing.

10. Privacy Policy

You consent to the collection, processing and storage by Riiid of your personal information in accordance with the terms of Riiid’s Privacy Policy. You agree to comply with all applicable laws and regulations, and the terms of Riiid’s Privacy Policy, with respect to any access, use and/or submission by you of any personal information in connection with this website. For a detailed description of how Riiid collects and uses personal data about you, please see Riiid’s Privacy Policy.

11. Contact

If you have any questions or concerns regarding the Service or Terms of Use, please write to Riiid at or at our offices located at 10F, Parnas Tower, 521, Teheran-ro, Gangnam-gu, Seoul, Korea.

12. Prohibited Activities

You understand that the Service is available for your personal, non-commercial use only.

In addition, you agree not to use the service to:

In the event you engage in prohibited activities, Riiid shall notify such violation and take appropriate actions such as suspending the use of Service, withdrawal of membership, restriction on membership registration (collectively referred as “Sanctions”). Riiid may impose Sanctions prior to notification in urgent circumstances such as to operate websites, or to take complaints from other members.

You may file an objection on Riiid’s Sanctions by submitting relevant documentations.

Upon receiving your objection, Riiid shall review relevant documentations, statements from you and shall notify Riiid’s decision on the Sanctions.


In the event that you have been withdrawn from membership, Riiid shall delete your information immediately. Nonetheless, Riiid shall retain your information pursuant to relevant law, Privacy Policy, and to prevent you from re-enrollment of membership.

13. Warranties and Disclaimers

  1. The materials on Service are provided "as is". Riiid makes no warranties, expressed or implied, and hereby disclaim and negate all other warranties, including without limitation, implied warranties or conditions of merchantability, fitness for a particular purpose, or non-infringement of intellectual property or other violation of rights. Further, Riiid does not warrant or make any representations concerning the accuracy, likely results, or reliability of the use of the materials on Riiid’s websites, mobile apps, applications.
  2. Riiid and its subsidiaries, affiliates, officers, employees, agents, partners, and licensors make no warranty that (i) the Service will meet your requirements; (ii) the Service will be uninterrupted, timely, secure or error-free; (iii) the results that may be obtained from the use of the Service will be accurate or reliable; (iv) the quality of any products, services, information or other material purchased or obtained by you through the Service will meet your expectations; and (v) any errors in the software will be corrected.
  3. The Service may be temporarily unavailable from time to time for maintenance or other reasons. Riiid assumes no responsibility for any error, omission, interruption, deletion, defect, delay in operation or transmission, communications line failure, theft or destruction or unauthorized access to, or alteration of, communications.
  4. Riiid shall not be responsible for any loss or damage, including any loss or damage to any User Content or personal injury or death, resulting from anyone's use of the Service, any User Content or third-party applications, software or content posted on or through the website or the Service or transmitted to Users, or any interactions between users in website, whether online or offline.

14. Limitation of Liability



15. Indemnification

You agree to indemnify, defend, and hold harmless Riiid, its officers, directors, employees, agents, other service providers, vendors or customers from and against all losses, expenses, damages and costs, including reasonable attorneys fees resulting from any violation of these Terms of Use by you or any harm you may cause to anyone in connection with your use of the Service, including, for the avoidance of doubt, your use, or the use by any of your affiliates, of the Service for competitive purposes.

16. Entire Agreement

The Terms of Use governs your use of the Service and constitutes the entire agreement between you and Riiid. It supersedes any prior agreements between you and Riiid. Additional terms and conditions may apply when you use the services of service providers and others. These additional terms will not reduce, diminish, or eliminate any rights Riiid possesses with respect to these Terms of Use.

17. Waiver and Severability of Terms

Any failure by Riiid to exercise any rights or enforce any provisions of these Terms of Use shall not constitute a waiver of such rights or terms. If any provision of these Terms of Use or its application in a particular circumstance is held to be invalid or unenforceable to any extent, the remainder of these Terms of Use, or the application of such provision in other circumstances, shall not be affected thereby, and each provision hereof shall be valid and enforced to the fullest extent permitted by law.

18. Governing Law and Jurisdiction

If a dispute arises between you and Riiid, Riiid will take appropriate and prompt action to reflect your legitimate opinions or complaints. However, if it is difficult to take prompt action, Riiid will notify you of the reason and expected schedule.

Notwithstanding the foregoing, these Terms of Use are governed by the laws of the Republic of Korea, and You consent and agree to the exclusive jurisdiction of the Seoul Central District Court with regard to disputes related to these Terms of Use.

19. Subscription/Ticket Services and Payment

Riiid offers purchase of Search Tickets and Question Tickets, as well as other subscription plans.

Riiid offers Registered Users the opportunity to purchase a Riiid Subscription, through which users will receive unlimited search tickets and a set of question tickets (depending on the plan). ALL RIIID SUBSCRIPTIONS WILL AUTOMATICALLY RENEW AT THE END OF THE TERM IF YOU DO NOT CANCEL PRIOR TO THE END OF THE SUBSCRIPTION TERM.

You agree to pay all applicable fees for Subscription/Ticket Services as set forth on our app and website. All fees are payable in the currency specified at the point of checkout at the time of purchase.

If you purchase the Subscription/Ticket Services through Apple App Store, Google Play Store, or other third-party platforms (as applicable), your refund request (if any) shall be subject to the terms and conditions of the such corresponding third-party platform. In case of refund, you will continue to have access to the Subscription Services until the end of your subscription period and will continue to have access to the Ticket Services until your payment is refunded.

In case you purchase the Subscription/Ticket Services through Apple App Store, Google Play Store, or other third-party platforms (as applicable), Riiid may provide aid regarding refund to a certain extent, under which the following conditions apply:

  1. In case of refund, a certain amount of transaction fee, cancellation fee, and other fees may apply.
  2. Prorated refunds are not available for partially used Subscription/Ticket Services. Please refer to the cancellation and refund policy of the Apple App Store or the Google Play Store for more details.
  3. For iOS users: Apple does not, in any case, allow Sellers to have access to the in-app purchase history of a user; thus, the user must contact and request a refund directly to the Apple App Store.

From time to time, Riiid may offer discounts, bonuses, coupons, loyalty programs, points programs, sweepstakes, contests, or other promotional incentives. These incentives typically have their own specific rules, restrictions, and limitations (e.g., limiting when, how often, and under what circumstances you may be eligible for the promotion). You are responsible for carefully reviewing and complying with these applicable rules, restrictions, and limitations.