ZeroNumbra
ZeroNumbra
Privacy Policy
Privacy Policy
For the ZeroNumbra mobile application
For the ZeroNumbra mobile application
Effective Date: September 22, 2026
Effective Date: September 22, 2026
Last Updated: September 22, 2026
Last Updated: September 22, 2026
In One Sentence
In One Sentence
ZeroNumbra does not collect, upload, or share any of your personal information. This app is a fully offline calculation tool: all calculations, history, and settings are stored only on your own device, and we have no technical means of accessing them.
ZeroNumbra does not collect, upload, or share any of your personal information. This app is a fully offline calculation tool: all calculations, history, and settings are stored only on your own device, and we have no technical means of accessing them.
1
1
Introduction and Scope
Introduction and Scope
[Developer Name] (referred to below as "we", "us", or "our") is the independent developer and operator of the mobile application ZeroNumbra (package name: [App Package Name], referred to below as "this App" or "the App"). We respect and value the privacy of every user.
[Developer Name] (referred to below as "we", "us", or "our") is the independent developer and operator of the mobile application ZeroNumbra (package name: [App Package Name], referred to below as "this App" or "the App"). We respect and value the privacy of every user.
This Privacy Policy explains how we handle information related to you when you download, install, and use this App. Please read it carefully before using the App. By downloading, installing, or using this App, you acknowledge that you have read, understood, and agreed to all of the terms of this Policy. If you do not agree, please stop using the App and uninstall it.
This Privacy Policy explains how we handle information related to you when you download, install, and use this App. Please read it carefully before using the App. By downloading, installing, or using this App, you acknowledge that you have read, understood, and agreed to all of the terms of this Policy. If you do not agree, please stop using the App and uninstall it.
2
2
How We Handle Information (Overview Table)
How We Handle Information (Overview Table)
The table below summarizes how this App handles common categories of data, so you can quickly see the picture.
The table below summarizes how this App handles common categories of data, so you can quickly see the picture.
Information Type Collected / Uploaded?
Information Type Collected / Uploaded?
Identity information such as name, email, phone number Not collected
Identity information such as name, email, phone number Not collected
Accounts, login credentials, passwords Not collected (the App has no account system)
Accounts, login credentials, passwords Not collected (the App has no account system)
Device identifiers (IMEI / Android ID / advertising ID, etc.) Not collected
Device identifiers (IMEI / Android ID / advertising ID, etc.) Not collected
Location information (precise or approximate) Not collected
Location information (precise or approximate) Not collected
Contacts, call logs, SMS Not collected
Contacts, call logs, SMS Not collected
Photo library, photos, videos, files Not collected
Photo library, photos, videos, files Not collected
Microphone, camera, sensor data Not collected
Microphone, camera, sensor data Not collected
Usage analytics / event tracking / user profiling Not collected
Usage analytics / event tracking / user profiling Not collected
Crash logs and diagnostic data Not uploaded
Crash logs and diagnostic data Not uploaded
Calculation expressions and history you enter in the App Stored locally only, never transmitted
Calculation expressions and history you enter in the App Stored locally only, never transmitted
This App does not require account registration and maintains no server-side database. We have no servers that collect user data, and therefore the question of "what data of yours we store" does not arise.
This App does not require account registration and maintains no server-side database. We have no servers that collect user data, and therefore the question of "what data of yours we store" does not arise.
3
3
Information Processed Locally on Your Device
Information Processed Locally on Your Device
To let you use the calculation features normally, this App creates and saves the following data locally on your device:
To let you use the calculation features normally, this App creates and saves the following data locally on your device:
Calculation history: expressions you have entered and results you have computed in the calculator;
Calculation history: expressions you have entered and results you have computed in the calculator;
Memory and stored values: the current values of memory variables such as M+ / M- / MR;
Memory and stored values: the current values of memory variables such as M+ / M- / MR;
App settings: preferences such as theme (light/dark), number format, decimal places, degrees/radians, and thousands separator;
App settings: preferences such as theme (light/dark), number format, decimal places, degrees/radians, and thousands separator;
Favorites and custom items: frequently used conversions or constants that you add yourself (if any).
Favorites and custom items: frequently used conversions or constants that you add yourself (if any).
The data above is stored in the private storage directory that the operating system allocates to this App. This App has no network transmission capability, and such data will not be sent to us or to any third party.
The data above is stored in the private storage directory that the operating system allocates to this App. This App has no network transmission capability, and such data will not be sent to us or to any third party.
About the Clipboard
About the Clipboard
This App writes the current result to the system clipboard only when you actively tap "Copy result"; the App does not read or monitor your clipboard contents in the background.
This App writes the current result to the system clipboard only when you actively tap "Copy result"; the App does not read or monitor your clipboard contents in the background.
Deleting Your Data
Deleting Your Data
You can permanently delete all local data in any of the following ways:
You can permanently delete all local data in any of the following ways:
Run "Clear history" in the App settings;
Run "Clear history" in the App settings;
Tap "Clear data" under the system's "Settings → Apps → ZeroNumbra → Storage";
Tap "Clear data" under the system's "Settings → Apps → ZeroNumbra → Storage";
Simply uninstall this App.
Simply uninstall this App.
Because the data exists only on your device, it cannot be recovered once deleted, and we cannot retrieve it for you.
Because the data exists only on your device, it cannot be recovered once deleted, and we cannot retrieve it for you.
4
4
App Permissions
App Permissions
This App adheres to the principle of least privilege and does not request any sensitive or dangerous permissions. Specifically, this App does not request the following permissions:
This App adheres to the principle of least privilege and does not request any sensitive or dangerous permissions. Specifically, this App does not request the following permissions:
Location (ACCESS_FINE_LOCATION / ACCESS_COARSE_LOCATION)
Location (ACCESS_FINE_LOCATION / ACCESS_COARSE_LOCATION)
Camera and microphone (CAMERA / RECORD_AUDIO)
Camera and microphone (CAMERA / RECORD_AUDIO)
Contacts and call logs (READ_CONTACTS / READ_CALL_LOG)
Contacts and call logs (READ_CONTACTS / READ_CALL_LOG)
SMS and phone (READ_SMS / READ_PHONE_STATE)
SMS and phone (READ_SMS / READ_PHONE_STATE)
External storage and media reading (READ_EXTERNAL_STORAGE / READ_MEDIA_IMAGES, etc.)
External storage and media reading (READ_EXTERNAL_STORAGE / READ_MEDIA_IMAGES, etc.)
Network access (INTERNET) — the App needs no internet connection to use all of its features
Network access (INTERNET) — the App needs no internet connection to use all of its features
If a future version requires any new permission, we will update this Policy and explain the purpose of that permission prominently within the App, and will use it only after obtaining your authorization.
If a future version requires any new permission, we will update this Policy and explain the purpose of that permission prominently within the App, and will use it only after obtaining your authorization.
5
5
Third-Party Services and SDKs
Third-Party Services and SDKs
This App integrates no third-party advertising, analytics, social login, user behavior tracking, or data monetization SDKs. This App contains no external advertising and performs no cross-app or cross-website tracking.
This App integrates no third-party advertising, analytics, social login, user behavior tracking, or data monetization SDKs. This App contains no external advertising and performs no cross-app or cross-website tracking.
About the Google Play Store
About the Google Play Store
This App is distributed through the Google Play Store. When you download, install, and update this App from Google Play, Google may collect data such as installation records, device information, and crash statistics as an independent data controller. Such processing is carried out by Google under its own privacy policy; we do not receive or store that data and have no access to it. For details, please refer to Google's Privacy Policy.
This App is distributed through the Google Play Store. When you download, install, and update this App from Google Play, Google may collect data such as installation records, device information, and crash statistics as an independent data controller. Such processing is carried out by Google under its own privacy policy; we do not receive or store that data and have no access to it. For details, please refer to Google's Privacy Policy.
In-App Purchases / Subscriptions (If Applicable)
In-App Purchases / Subscriptions (If Applicable)
If this App offers paid features in the future, all related payments will be completed through the Google Play billing system. We will not touch, collect, or store any of your payment information, such as credit card numbers, bank accounts, or billing addresses; such information is handled directly by Google.
If this App offers paid features in the future, all related payments will be completed through the Google Play billing system. We will not touch, collect, or store any of your payment information, such as credit card numbers, bank accounts, or billing addresses; such information is handled directly by Google.
6
6
Sharing, Transfer, and Public Disclosure of Information
Sharing, Transfer, and Public Disclosure of Information
Because this App collects no personal information whatsoever, there are no circumstances in which we share, transfer, or publicly disclose users' personal information:
Because this App collects no personal information whatsoever, there are no circumstances in which we share, transfer, or publicly disclose users' personal information:
We do not sell, rent, or trade any personal information;
We do not sell, rent, or trade any personal information;
We do not share any information with advertisers, data brokers, or business partners;
We do not share any information with advertisers, data brokers, or business partners;
We do not transfer any personal information in connection with a merger, acquisition, or bankruptcy (because we never hold any to begin with).
We do not transfer any personal information in connection with a merger, acquisition, or bankruptcy (because we never hold any to begin with).
The only possible exception is this: if we receive a valid, legally binding order (such as a court order or a lawful request from a government authority) and we in fact hold the relevant materials, we will comply in accordance with the law. However, as stated above, this App has no server-side user data, so such a situation will not arise in practice.
The only possible exception is this: if we receive a valid, legally binding order (such as a court order or a lawful request from a government authority) and we in fact hold the relevant materials, we will comply in accordance with the law. However, as stated above, this App has no server-side user data, so such a situation will not arise in practice.
7
7
Data Retention and Security
Data Retention and Security
Retention period. We retain no user data on the server side, so no server-side retention period exists. Local data on your device remains until you delete it yourself or uninstall this App.
Retention period. We retain no user data on the server side, so no server-side retention period exists. Local data on your device remains until you delete it yourself or uninstall this App.
Security measures. Because the way this App operates means data never leaves your device, the risk surface for data breaches is reduced to a minimum. To further protect your local data, we recommend that you:
Security measures. Because the way this App operates means data never leaves your device, the risk surface for data breaches is reduced to a minimum. To further protect your local data, we recommend that you:
Set a lock-screen password, pattern, or biometric unlock on your device;
Set a lock-screen password, pattern, or biometric unlock on your device;
Keep your operating system up to date to receive the latest security patches;
Keep your operating system up to date to receive the latest security patches;
Download this App only from official channels such as Google Play, and avoid installing tampered third-party builds.
Download this App only from official channels such as Google Play, and avoid installing tampered third-party builds.
Please note: although we have adopted reasonable technical design to protect your information, no technical measure can guarantee absolute security. If your device is physically accessed by others or is already controlled by malware, local data may still be read — this is a device-level risk and is beyond this App's control.
Please note: although we have adopted reasonable technical design to protect your information, no technical measure can guarantee absolute security. If your device is physically accessed by others or is already controlled by malware, local data may still be read — this is a device-level risk and is beyond this App's control.
8
8
Children's Privacy
Children's Privacy
This App is a general-purpose mathematical calculation tool suitable for users of all ages, including minors, and does not conduct targeted marketing to children under 13 (or the corresponding age specified in your jurisdiction).
This App is a general-purpose mathematical calculation tool suitable for users of all ages, including minors, and does not conduct targeted marketing to children under 13 (or the corresponding age specified in your jurisdiction).
This App collects no personal information from any user, including any personal information from children — it collects neither names, ages, or contact details, nor device identifiers or location information. Accordingly:
This App collects no personal information from any user, including any personal information from children — it collects neither names, ages, or contact details, nor device identifiers or location information. Accordingly:
This App contains no advertising directed at children, nor any form of personalized advertising;
This App contains no advertising directed at children, nor any form of personalized advertising;
This App contains no social features, user-to-user chat, or content upload features;
This App contains no social features, user-to-user chat, or content upload features;
This App contains no external links that lead children out of the App to make purchases.
This App contains no external links that lead children out of the App to make purchases.
We comply with the relevant requirements of the U.S. Children's Online Privacy Protection Act (COPPA), Article 8 of the EU General Data Protection Regulation (GDPR), and Google Play's Families Policy. If you are a parent or guardian and believe that your child has provided personal information to us in any way, please contact us using the developer contact information listed on our Google Play Store page, and we will act promptly once verified. Since this App collects no information at all, such a situation will not arise in practice.
We comply with the relevant requirements of the U.S. Children's Online Privacy Protection Act (COPPA), Article 8 of the EU General Data Protection Regulation (GDPR), and Google Play's Families Policy. If you are a parent or guardian and believe that your child has provided personal information to us in any way, please contact us using the developer contact information listed on our Google Play Store page, and we will act promptly once verified. Since this App collects no information at all, such a situation will not arise in practice.
9
9
International Users and Your Rights
International Users and Your Rights
Cross-border transfers. This App performs no cross-border data transfers, because no copy of the App's data exists outside your device.
Cross-border transfers. This App performs no cross-border data transfers, because no copy of the App's data exists outside your device.
Your rights. Wherever you are located, the rights you hold over your personal information are fully exercised by you alone in this App. Because all data resides on your device:
Your rights. Wherever you are located, the rights you hold over your personal information are fully exercised by you alone in this App. Because all data resides on your device:
Your Right How to Exercise It
Your Right How to Exercise It
Access and review View directly on the App's history and settings pages
Access and review View directly on the App's history and settings pages
Correction and amendment Edit directly within the App, or re-enter the data
Correction and amendment Edit directly within the App, or re-enter the data
Deletion Clear data within the App, or uninstall the App
Deletion Clear data within the App, or uninstall the App
Data portability The data already exists in full on your device
Data portability The data already exists in full on your device
Withdrawal of consent Uninstalling the App constitutes withdrawal of all consent
Withdrawal of consent Uninstalling the App constitutes withdrawal of all consent
If you are located in the European Economic Area, the United Kingdom, Switzerland, California, or another region with dedicated data protection legislation, you may also have the right to lodge a complaint with your local supervisory authority. It should be noted that, since we are not a controller of your personal data (no control relationship exists), our obligations are embodied primarily in the very fact of "not collecting"; however, if you have any questions about privacy, you are still welcome to contact us using the means described in Section 11.
If you are located in the European Economic Area, the United Kingdom, Switzerland, California, or another region with dedicated data protection legislation, you may also have the right to lodge a complaint with your local supervisory authority. It should be noted that, since we are not a controller of your personal data (no control relationship exists), our obligations are embodied primarily in the very fact of "not collecting"; however, if you have any questions about privacy, you are still welcome to contact us using the means described in Section 11.
No automated decision-making. This App does not make automated decisions based on any of your data, and does not perform user profiling.
No automated decision-making. This App does not make automated decisions based on any of your data, and does not perform user profiling.
10
10
Changes to This Policy
Changes to This Policy
We may update this Privacy Policy from time to time to reflect adjustments to the App's features, changes in legal requirements, or updates to industry practice.
We may update this Privacy Policy from time to time to reflect adjustments to the App's features, changes in legal requirements, or updates to industry practice.
Any changes will be posted on this page, and the "Last Updated" date and version number at the top will be revised accordingly;
Any changes will be posted on this page, and the "Last Updated" date and version number at the top will be revised accordingly;
If a change materially expands the scope of data collection (for example, if advertising or statistical analysis is introduced in the future), we will provide a separate notice within the App by popup or other prominent means, and will seek your consent again where necessary;
If a change materially expands the scope of data collection (for example, if advertising or statistical analysis is introduced in the future), we will provide a separate notice within the App by popup or other prominent means, and will seek your consent again where necessary;
The updated policy takes effect on the date it is published. If you continue to use this App after the policy is updated, you are deemed to accept the updated content.
The updated policy takes effect on the date it is published. If you continue to use this App after the policy is updated, you are deemed to accept the updated content.
We recommend that you revisit this page periodically to stay informed of the latest version.
We recommend that you revisit this page periodically to stay informed of the latest version.