Privacy Policy

Effective date: July 20, 2026

Poppin Studio ("we", "us", "our") operates the Android application "Poppin" (the "App") and the website poppin-studio.com (the "Site"; together with the App, the "Service"). This Privacy Policy (this "Policy") explains how information relating to users of the Service is handled, and reflects our commitment to compliance with the Japanese Act on the Protection of Personal Information (the "APPI") and other applicable laws.

1. Definitions

In this Policy, the following terms have the meanings set out below.

  1. "Personal Information" means personal information as defined in Article 2, Paragraph 1 of the APPI.
  2. "User" means any person who uses the Service.
  3. "On-Device Data" means any information a User creates, enters, or stores through the App, and any information the App holds solely on the device during operation — including decks and card content (text, images, audio), study progress and spaced-repetition state, user settings, monitored-application usage state, and media-playback state.

2. Information We Handle

2.1 On-Device Data

On-Device Data is processed on the User's device solely to operate the App's features. It is stored only in Android's SharedPreferences and internal storage, and is never transmitted to servers operated by us or to any third party. We do not obtain, view, copy, or retain On-Device Data.

2.2 Information handled by third-party services

The App integrates the third-party services listed below. Each such service handles information in accordance with its own privacy policy, which the User is encouraged to consult.

  1. Google AdMob (provider: Google LLC) — for ad delivery. May receive the Android Advertising ID, coarse location, and technical device information (Google Ads Policies).
  2. RevenueCat (provider: RevenueCat, Inc.) — for managing in-app purchases. Receives an anonymized purchase ID, purchase timestamp, and receipt information (RevenueCat Privacy Policy).

3. Purposes of Use

Information described in Section 2 is used only for the following purposes:

  1. providing and operating the App's core features (flashcard study, spaced-repetition scheduling, and Pop Study);
  2. determining when to display the study prompt based on the User's activity in monitored applications;
  3. improving the quality of the Service, diagnosing defects, and developing future functionality;
  4. delivering advertisements and managing billing for paid features.

4. Android Permissions Used by the App

To implement its core features, the App requests the following Android permissions from the User. Each is used only within the scope required by its stated purpose and is not used for any other purpose.

  1. Usage Access (PACKAGE_USAGE_STATS): detecting the foreground application.
  2. Accessibility Service: detecting URLs within monitored applications such as browsers.
  3. Display over other apps (SYSTEM_ALERT_WINDOW): presenting the study prompt in front of other content.
  4. Notification Listener Service: detecting picture-in-picture playback.
  5. Foreground Service: performing continuous background monitoring.
  6. KILL_BACKGROUND_PROCESSES: stopping background playback from monitored applications when a study prompt fires.

5. Sharing with Third Parties

Except as set out below, we will not disclose Personal Information to any third party without the User's prior consent:

  1. where required by law;
  2. where necessary to protect the life, body, or property of an individual, and obtaining consent is impracticable;
  3. where specifically necessary to improve public health or promote the sound upbringing of children, and obtaining consent is impracticable;
  4. where necessary to cooperate with a governmental authority or its delegate performing statutory duties, and obtaining consent might interfere with those duties.

6. Safeguards

We implement reasonable and appropriate safeguards to prevent the leakage, loss, or corruption of information handled in connection with the Service. Because On-Device Data is not stored on any server operated by us, the responsibility for safeguarding that data rests with the User; each User should take appropriate measures against device loss, theft, and unauthorized access.

7. Access, Correction, and Deletion

On-Device Data can be deleted in its entirety by uninstalling the App. For information handled by third-party services (such as the Android Advertising ID), please use the reset or deletion controls in Android's ads settings, or the opt-out mechanisms provided by each service.

8. About the Site

The Site consists of static web pages only. It does not set cookies, collect personal information through forms or other means, or use analytics tools. If any of these are introduced in the future, this Policy will be updated in advance and notice given on the Site.

9. Changes to this Policy

We may revise this Policy as needed to reflect changes in applicable law, changes to the Service, or otherwise. Any revised Policy takes effect when posted on the Site. Material changes will be announced separately in the App or on the Site.

10. Contact

Questions about this Policy may be directed to:

Poppin Studio
Email: contact@poppin-studio.com

Revision History