Privacy Policy

CloudEx Inc. ("we", "us", or "our") operates the "Scientific Calculator Pro" app (the "Service"). This Privacy Policy explains what information we collect, how we use it, and the choices available to you. By using the Service, you are deemed to have agreed to the practices described in this Policy.

1. Our Core Principle

Scientific Calculator Pro is a scientific calculator with fractions, complex numbers, statistics, matrices, a function table, unit conversion and physical constants, and — with Premium — a graphing calculator, an equation solver and a programmer calculator. Every calculation runs entirely on your device. What you enter and what you calculate are yours: they are stored on your device, and we never view, collect, upload, or transmit them to our servers. There is no account and no sign-up. Specifically, we do not have access to any of the following:

  • The expressions you enter and the results you get
  • Your calculation history, including the entries you pin and the notes you add
  • Your variables (A–D, x, y, z, M) and the last answer (Ans)
  • What you enter in each tool, such as graph expressions, solver inputs, statistics data and matrices
  • The backup files you save, and the results, tables and graph images you share

Your calculations leave your device only through actions you take yourself: copying or sharing a result, sharing a table or a graph image, or saving a backup file (Section 2).

2. Copying, Sharing, and Backup Files

  • Copy and paste: When you copy a result, it is placed on your device's clipboard. The app reads the clipboard only when you choose to paste — into an expression, or as statistics data or a matrix.
  • Sharing: When you share a result, a table or statistics data (as a CSV file), or a graph (as an image), Android's share sheet opens and the content goes only to the app or person you choose.
  • Backup and restore: “Backup and restore” in the settings writes your settings, variables, the contents of each tool and your calculation history to a single file, saved where you choose in Android's file picker. Your Premium purchase is not included. Restoring reads only the file you pick. We never receive these files.
  • Contacting us: If you use “Contact us” in the app, your email app opens with the app version, Android version and device model filled in. You can review or remove them before sending, and we receive only what you send.

3. Information We Collect

3.1 Information Collected Automatically

  • Crash reports: Via Firebase Crashlytics. When the app crashes or stops responding, we collect the stack trace (the part of the app where the problem occurred), device model, Android version, app version, and a random installation identifier that Crashlytics uses to count how many installations are affected. Crash reports do not include your calculations, your history, or anything else you enter in the app.
  • Purchase information: Premium is a one-time purchase processed by Google Play. The app asks Google Play, on your device, whether your Google account owns Premium. We never receive payment information such as credit card numbers.
  • List of our other apps: To show our other apps (the card and “Our other apps” in the settings), the app downloads their names, descriptions, and artwork from our content server (static files hosted on Cloudflare Pages), at most once each time the app is started; the artwork is then kept in the app's cache. The requests are plain downloads and contain no personal data or identifier from the app; the only thing they reflect is which language's artwork is fetched. As with any request to a web server, the server receives your device's IP address, and the standard request header that Android adds (which names the Android version and device model), as part of the connection. To decide which apps to show, the app checks on your device whether our apps are already installed and which country your SIM card, mobile network or language setting indicates; the results of these checks are never sent anywhere. Tapping an app opens its page on Google Play, with a link that tells Google Play it came from Scientific Calculator Pro.
  • This privacy policy: “Privacy Policy” in the app opens this page from our website (scientificcalculatorpro.cloud-ex.biz). As with any web page, our web server receives your device's IP address and the browser information sent with the request. If the page cannot be loaded, the app shows a copy of the policy stored in the app instead.

3.2 Information Stored Only on Your Device

  • Calculation history: The expressions you calculate and their results, with the pins and notes you add. Pinned entries are kept; of the others, the newest 500 are kept and older ones are removed automatically.
  • Variables: The values stored in A–D, x, y, z and M, and the last answer (Ans).
  • The contents of each tool: Graph expressions and view settings, solver inputs, statistics data, matrices and vectors, unit-converter values and pinned units, favourite and recent constants, programmer-calculator entries, and the like.
  • App settings: Angle unit, number format, input and display preferences, theme, and similar settings. The expression you were typing when you left the app, and records the app keeps for itself (such as when it last asked for a review), are also stored on your device.
  • Premium status: Whether Premium is unlocked is remembered on your device, so that the Premium features also work offline. It is checked again with Google Play.
  • Android backup: If backup is turned on in your device settings, Android may include your settings (including whether Premium is unlocked), variables, the contents of each tool and your calculation history in the backup it saves to your own Google account, and may copy them to a new phone when you transfer your data. The expression you were typing and the app's own records are excluded. This is handled by Android; we have no access to it.
  • When you uninstall: Uninstalling the app or clearing its data deletes everything stored in the app. Backup files you saved, and files you shared, remain where you put them until you delete them.

3.3 Information We Explicitly Do Not Collect

  • Your expressions, results, history, variables, or anything you enter in the tools
  • Your name, email address, phone number, or contacts (the app has no account or sign-up)
  • Your location
  • Your device's advertising ID (the app does not use Google Analytics for Firebase or any other analytics service)
  • A list of the apps installed on your device (the app only checks, on your device, whether our own apps are installed)
  • The contents of your screen or of other apps

3.4 Permissions the App Requests and Their Purposes

Scientific Calculator Pro asks for no permission that needs your approval. It has no access to your location, contacts, camera, microphone, photos or notifications, and it reads or writes a file only when you pick that file in Android's file picker. It declares only the following, which Android grants at installation:

  • Internet (INTERNET) — Used only for crash reports, Google Play purchases, in-app reviews and in-app updates, downloading the list of our other apps, and showing this privacy policy in the app. Calculations never need an internet connection.
  • Network state (ACCESS_NETWORK_STATE) — Added by the Firebase libraries used for crash reports, to check whether the device is online before sending a report.
  • Google Play billing (com.android.vending.BILLING) — Lets you buy Premium through Google Play.

4. How We Use Information

The limited information we collect is used only for the following purposes:

  • Operating and maintaining the Service
  • Unlocking Premium for your purchase
  • Diagnosing and fixing crashes
  • Showing our other apps
  • Responding to support inquiries
  • Complying with applicable laws

5. Third-Party Services

Scientific Calculator Pro uses the following third-party services. Each service has its own privacy policy.

  • Firebase Crashlytics (Google LLC) — crash diagnostic data
  • Google Play Billing (Google LLC) — the one-time Premium purchase; payment is completed on Google Play
  • Google Play In-App Review and In-App Updates (Google LLC) — let you rate the app and install updates without leaving it; handled by Google Play
  • Cloudflare Pages (Cloudflare, Inc.) — hosts the static list of our other apps

Scientific Calculator Pro does not use your device's advertising ID and does not share your data with advertising networks.

6. Data Retention

  • Crash reports: retained for 90 days, then deleted.
  • Your history, variables, tool contents, and settings on your device: kept until you delete them in the app, uninstall the app, or clear the app's data. Of the history entries you have not pinned, only the newest 500 are kept.

7. International Data Transfers

We are based in Japan. The infrastructure used for crash diagnostics, for hosting the list of our other apps, and for this website may be located in various countries. When you use the Service, the minimal information described above may be processed outside your country of residence under standard contractual safeguards.

8. Your Rights

Depending on where you reside (e.g., the EEA, UK, California, Japan), you may have the right to request access to, correction of, or deletion of the limited information we hold. You can:

  • Delete history entries in the app at any time, or use “Clear history” in the settings
  • Uninstall the app or clear its data to erase everything stored in the app on your device
  • Turn off backup in your device settings, so that Android does not include the app's data in the backup saved to your Google account
  • Contact us at the address below to make a request regarding the information we hold

9. Children's Privacy

Scientific Calculator Pro does not ask anyone, including children, for personal information, and it has no account or sign-up. What leaves the device automatically is limited to what is described in Section 3.1 and never includes what is calculated or entered in the app. If you believe that a child under the age of 13 (or the minimum age applicable in your region) has sent us personal information, for example by email, please contact us and we will delete it promptly.

10. Changes to This Policy

This Privacy Policy may be updated from time to time. The latest version is always published at this URL together with its effective date. We will also notify you within the app of significant changes as appropriate.

11. Contact

For questions about privacy, data requests, or to report concerns, please email us at .

CloudEx Inc. (Japan)

Effective Date: October 17, 2026