Terms of Service

Effective date: July 20, 2026

These Terms of Service (these "Terms") govern use of the Android application "Poppin" (the "App") and the website poppin-studio.com (the "Site"; together with the App, the "Service") provided by Poppin Studio ("we", "us", "our"). By using the Service, you (the "User") agree to be bound by these Terms.

1. Application

  1. These Terms apply to any and all relationships arising in connection with use of the Service.
  2. Any additional rules and notices that we publish within the Service form part of these Terms.
  3. In the event of a conflict between these Terms and such additional rules, the additional rules prevail.

2. The Service

The App is an Android application that provides flashcard study and spaced-repetition scheduling features, along with a feature that measures the time you spend in other applications you have designated and, when certain conditions are met, displays a study prompt ("Pop Study"). The specific features, specifications, and operating conditions of the App are documented on its Google Play listing and other locations we may designate.

3. Conditions of Use

The Service is intended for use on Android devices. The User uses the Service at their own risk and accepts all consequences of that use.

4. Prohibited Conduct

The User must not engage in any of the following in connection with the Service:

  1. any act that violates applicable law or public order and morals;
  2. copying, modifying, adapting, redistributing, selling, renting, reverse-engineering, decompiling, or disassembling the App (except to the extent expressly permitted by applicable law);
  3. interfering with normal operation of the Service or otherwise causing loss or detriment to us or to any third party;
  4. using the App's features to forcibly obstruct legitimate use of another application by another person;
  5. providing false information in the course of registration or purchase;
  6. infringing any intellectual-property or other rights related to the Service;
  7. any other conduct that we reasonably determine to be inappropriate.

5. User Content

  1. Decks, cards, and any associated media files that a User creates or imports in the App ("User Content") remain the property of that User or the applicable rights-holder.
  2. We do not receive any User Content. User Content is stored solely on the User's device.
  3. The User represents and warrants that their User Content does not infringe any third-party right, and shall resolve at their own cost and responsibility any claim of infringement asserted against such User Content.

6. Paid Features and Billing

  1. Certain features of the App are made available as one-time paid items ("Paid Features").
  2. Purchases of Paid Features are processed through Google Play, and billing, payment, and related matters are governed by Google LLC's terms.
  3. Refunds after purchase are governed by Google Play's refund policy, and we do not, as a rule, process refunds individually.

7. Advertising

For Users who have not purchased the Paid Features, the App displays advertisements through Google AdMob. Advertising revenue funds the operation of the Service. Ads-personalization can be adjusted from your Android device's advertising settings.

8. Disclaimer

  1. The Service is provided "as-is". We make no warranty, express or implied, as to completeness, accuracy, reliability, usefulness, fitness for a particular purpose, or continued availability of the Service.
  2. Except in cases of our wilful misconduct or gross negligence, we are not liable for any damages arising from the User's use of, or inability to use, the Service, including loss of profits, lost business opportunity, or loss or corruption of data.
  3. To the extent permitted by applicable law, where we are found liable, our aggregate liability is limited to the amount the User actually paid to us for the feature that gave rise to the damage.

9. Changes, Suspension, Termination

We may temporarily suspend the Service for maintenance, incident response, or other operational reasons. We may also modify the content of the Service, or suspend or terminate the Service, at any time without prior notice, and are not liable for any resulting damages to the User or any third party.

10. Changes to these Terms

We may revise these Terms from time to time without prior notice. Revised Terms take effect when posted on the Site. Material changes will be announced separately in the App or on the Site.

11. Governing Law and Jurisdiction

These Terms are governed by and construed in accordance with the laws of Japan. Any dispute arising in connection with these Terms or the Service shall be subject to the exclusive jurisdiction of the district court having jurisdiction over our address, as the court of first instance.

12. Contact

Questions about these Terms may be directed to:

Poppin Studio
Email: contact@poppin-studio.com

Revision History