Integral Practice (積分実践演習)
Last updated: 2026-10-05
This Privacy Policy explains how we handle information in connection with the Integral Practice mobile application (the "App"). We have deliberately written it in plain language, because the honest summary is short: the App does not collect your personal information, and it does not send your data anywhere.
| Question | Answer |
|---|---|
| Do we collect personal information? | No |
| Does the App require an account or sign-in? | No |
| Does the App send data to our servers? | No — we do not operate any servers |
| Does the App contain advertising? | No |
| Does the App contain analytics or crash-reporting tools? | No |
| Does the App share data with third parties? | No |
| Does the App work without an internet connection? | Yes, entirely |
We do not collect any personal information.
We do not ask for, and the App does not transmit, any of the following: your name, email address, phone number, postal address, date of birth, gender, location, contacts, photos, camera or microphone input, advertising identifier, or any other identifier that could be used to identify you.
We have no ability to identify individual users of the App.
So that the App can remember what you have studied, it saves a small amount of study-related information locally on your device only. This information never leaves your device and is never accessible to us.
| What is stored | Why |
|---|---|
| Whether each exercise is marked "Done" or "Needs review" | To show your progress and build your review list |
| Whether each lesson has been read | To show your overall progress |
| Your preferred formula font size | To display the App as you configured it |
| Your language preference | To display the App in your chosen language |
This information contains no personal identifiers. It is keyed to exercise IDs within the App, not to you.
The App also reads your device's language setting so that it can select a suitable default language on first launch. This is read on your device and is not transmitted anywhere.
We do not collect, and the App does not transmit:
The locally stored information described in Section 2.1 is used for one purpose only: to make the App work as you expect it to. It powers your progress display, your review list, your font-size setting, and your language setting.
We do not use it for advertising, profiling, marketing, or any other purpose. We cannot access it, and we do not receive it.
The App is designed to work fully offline. All exercise content, lesson explanations, and mathematical typesetting resources are bundled inside the App itself. Mathematical formulas are rendered locally on your device and remain readable in airplane mode.
The App does not make network requests to us or to any third party. Because there is no transmission, there is no data of yours that could be intercepted, interrupted, or lost in transit.
We do not share, sell, rent, trade, or otherwise disclose your information to anyone, because we do not have your information.
The App does not integrate any third-party advertising networks, analytics providers, social media plug-ins, or data brokers.
App stores as platform providers. When you download or use the App from an app store, the operator of that store may collect certain information in that role — for example, download and purchase records, and aggregated store analytics. On Apple platforms that operator is Apple, as the operator of the App Store and the iOS platform; on Android it is Google, as the operator of Google Play. That collection is performed by Apple or Google under their own privacy policies, and we do not receive personal information from it. We receive only aggregated, non-identifying statistics that those stores make available to all developers, and only if we choose to view them. Please refer to Apple's Privacy Policy (https://www.apple.com/legal/privacy/) and Google's Privacy Policy (https://policies.google.com/privacy) for details.
The App contains no advertising, no analytics tools, and no tracking technologies.
We do not track you across apps or websites, and we do not use any advertising identifier — neither Apple's Advertising Identifier (IDFA) nor Android's advertising ID. Consequently, the App never asks for tracking permission, such as Apple's App Tracking Transparency prompt, because there is nothing to ask permission for.
The App is a mathematics study tool that may be used by students, including students under the age of 13.
Because the App collects no personal information from anyone, it collects no personal information from children. We do not knowingly or unknowingly collect, use, or disclose personal information from children, and no parental consent mechanism is required, because no such collection takes place.
The App contains no advertising, no in-app purchases, no social features, no external links to user-generated content, and no communication features. A child using the App cannot transmit information to us or to any third party through it.
If you are a parent or guardian and have questions about your child's use of the App, please contact us using the details in Section 13.
Because we hold no personal information about you, there is nothing for us to disclose, correct, export, or delete on your behalf. You nonetheless have full control over the study data stored on your device:
If you are in the European Economic Area, the United Kingdom, Switzerland, California, or another jurisdiction that grants you rights of access, correction, deletion, restriction, portability, or objection, those rights apply to personal data held by an organisation. Since we hold no personal data about you, there is no data to which these rights can attach. Should this ever change, we will update this Policy and provide the mechanisms required by applicable law.
Study data and settings remain on your device until you delete them, either through the App's reset option or by uninstalling the App.
We retain nothing, because we receive nothing.
Device backups. If you back up your device — to iCloud or Google Drive, to a computer, or through any other backup service — your App data may be included in that backup. Those backups are created and controlled by you and by the relevant backup provider, and are governed by that provider's terms and privacy policy, not by this Policy. We have no access to your backups.
We do not transmit or store your information on any server, so there is no database of ours that could be breached, and no transmission of yours that could be intercepted.
Data stored on your device is protected by your device's own security features, such as your passcode or screen lock, biometric unlock (Face ID, Touch ID, or Android biometrics), and the operating system's application sandbox. We recommend keeping your device's operating system up to date and using a device passcode.
We do not transfer personal data across borders, because we do not collect personal data. Your study data stays on your device, wherever your device is located.
We may update this Privacy Policy from time to time — for example, if a future version of the App adds a feature that changes how information is handled. When we do, we will revise the "Last updated" date at the top of this page.
If a future version of the App ever begins collecting personal information, we will update this Policy before that version is released, describe the change clearly, and — where required by law — obtain your consent first.
We encourage you to review this page periodically.
If you have any questions, concerns, or requests regarding this Privacy Policy or the App's handling of information, please contact us at:
zeuscult@outlook.com
We will respond as promptly as we reasonably can.
This Privacy Policy applies to the Integral Practice (積分実践演習) application on all platforms.