CloudEx Inc. ("we", "us", or "our") operates the "Memo 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
Memo Calculator Pro is a calculator that keeps your history and notes. It combines a calculator with tax, discount, receipt, bill-splitting and unit price tools, and keeps every answer in one history together with the memo you add. All calculations run entirely on your device. Your expressions, answers, memos, calc notes and the items you compare 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 numbers and expressions you type, and their answers
- Your history, the memos you add, and the color labels and pins you set
- Your calc notes
- The items, prices, stores and dates you enter for unit price comparison and the lowest-price book
- The amounts you enter for tax, discounts, receipts, bill splitting, profit and withholding
Your data leaves your device only through actions you take yourself: copying or sharing text, exporting a backup or a CSV file, or Android's own backup (Section 3.2).
2. Your Calculations and Where They Are Kept
- On your device: The history (and the trash, where deleted entries wait for 30 days), your calc notes, the lowest-price book, named memories and your settings are stored in the app's own storage on your device.
- Home screen widget: If you add the "Last answer" widget to your home screen, it shows your most recent answer there, where anyone who sees your home screen can read it. You can remove the widget at any time.
- Copy and paste: The app writes to the clipboard only when you copy an answer, an entry or a note, and reads the clipboard only when you paste into the app yourself.
- When anything leaves your device: Only when you share text with an app you choose, or export a backup file or a history CSV file to a location you choose. We never receive any of it.
3. Information We Collect
3.1 Information Collected Automatically
- Anonymous crash reports: Via Firebase Crashlytics. When the app crashes, we collect the stack trace, device model, OS version, and app version. Each report also carries a random identifier that Firebase creates for this installation of the app; it is used only to group reports and is not your advertising ID. This does not include personally identifiable information or anything you have entered in the app.
- Purchase information: We use purchase tokens issued by Google Play to verify your one-time "Premium" purchase. We never receive any payment information such as credit card numbers.
- List of our other apps: To show our other apps, the app downloads their names, descriptions, and icons from our content server (static files hosted on Cloudflare Pages). The request contains no personal data from the app. As with any request to a web server, the server receives your device's IP address as part of the connection. Tapping an app in the list opens its page on Google Play.
The app does not use any analytics service and does not access your device's advertising ID.
3.2 Information Stored Only on Your Device
- History, calc notes, lowest-price book and named memories: Stored on your device as described in Section 2. They never leave it unless you share or export them.
- App settings: Tax rates, rounding, number format, theme, the values you leave in each tool and similar settings are stored on your device.
- Backup files you create: "Backup and restore" writes your settings, history and calc notes to a single file in the location you choose, and reads it back only when you choose to restore it.
- Android backup: If backup is turned on in your device settings, Android may include the app's settings, history and calc notes in the backup it saves to your own Google account, and may copy them to a new phone when you transfer your data directly. This is handled by Android; we have no access to it.
- When you uninstall: Uninstalling the app or clearing its data deletes the history, calc notes, lowest-price book and settings stored in the app's own storage. Backup and CSV files you exported remain where you saved them until you delete them.
3.3 Information We Explicitly Do Not Collect
- The numbers, expressions, answers, memos and calc notes you enter
- The items, prices and stores you enter
- Your name, email address, phone number, or contacts (the app has no account or sign-up)
- Your location
- A history of the websites you visit or the contents of your communications
- The contents of your screen or of other apps
3.4 Permissions the App Requests and Their Purposes
Memo Calculator Pro asks for no permission that you need to grant. It uses only the following, for the stated purposes:
- Internet (INTERNET) and network state (ACCESS_NETWORK_STATE) — Used only for anonymous crash reports, Google Play purchase verification, in-app reviews and in-app updates, downloading the list of our other apps, and showing this privacy policy in the app. Calculations, the history and calc notes do not require an internet connection.
- Google Play billing (com.android.vending.BILLING) — Used only to purchase 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
- Verifying your Premium purchase
- Diagnosing and fixing crashes
- Responding to support inquiries
- Complying with applicable laws
5. Third-Party Services
Memo Calculator Pro uses the following third-party services. Each service has its own privacy policy.
- Firebase Crashlytics (Google LLC) — anonymous crash diagnostic data
- Google Play Billing (Google LLC) — the one-time Premium purchase; payment is completed on Google Play, and we receive only a purchase token
- 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
Memo Calculator Pro does not share your data with advertising networks.
6. Data Retention
- Crash reports: retained for 90 days, then deleted.
- Your history, calc notes, lowest-price book and settings on your device: kept until you delete them, uninstall the app, or clear the app's data. Entries you delete wait in the trash for 30 days and are then deleted automatically. Entries without a memo, pin or color label are kept up to the newest 2,000; older ones are deleted automatically.
7. International Data Transfers
We are based in Japan. The infrastructure used for crash diagnostics and hosting the list of our other apps 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 and calc notes in the app at any time, empty the trash, or uninstall the app or clear its data to erase everything stored on your device
- Remove the "Last answer" widget from your home screen at any time
- Contact us at the address below to make a request regarding the information we hold
9. Children's Privacy
Memo Calculator Pro is not directed to children under the age of 13 (or the minimum age applicable in your region). If we inadvertently collect information from such a child, we will delete it promptly upon being contacted.
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 26, 2026