Privacy Policy · Word Collector

CloudEx Inc. ("we", "us", or "our") operates the "Word Collector" 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

Word Collector is a personal vocabulary notebook. You collect words from what you read, together with their example sentences and sources, and learn them with spaced repetition flashcards. Your collection is yours: it is stored on your device, and we never view, collect, upload, or transmit it to our servers. There is no account and no sign-up. Specifically, we do not have access to any of the following:

The words you collect and their meanings, readings, notes, tags, and decks
Your example sentences, and the passages you select, share, paste, or read from photos
The sources you keep with your words (page titles and URLs)
Your review history and learning statistics
The contents of your clipboard
The photos you take or choose in the app

Your words leave your device only through actions you take or options you turn on yourself: looking a word up on a website, exporting or backing up to a place you choose, or Android's own device backup (Sections 2 and 3.2).

2. Text, Clipboard, Photos, Translation, and Speech

Text you collect: The app receives only the text you select and send to it, share with it, paste into it, or type yourself. It does not read your screen or the contents of other apps.
Clipboard: The contents of your clipboard are read only when you tap a button or tile that collects from it, such as "From copied text". To decide whether to offer that button, the app looks only at the clipboard's description (its type and the time of the copy), not at its contents.
Reading from photos (Premium): Text in a photo is recognized on your device by Google's ML Kit, using a model managed by Google Play services. Your photos are not uploaded. A photo you take is kept temporarily in the app's cache and deleted after it has been read. The app does not request the camera permission; your camera app takes the photo.
Translation drafts: Translation runs on your device using Google's ML Kit. The translation data for a language (about 30 MB) is downloaded from Google only when you ask for it. The words and sentences you translate are not sent anywhere.
Reading aloud: Words and sentences are passed to the text-to-speech engine installed on your device. That engine is provided by your device maker or by Google, not by us, and is subject to its provider's terms.
Looking up a word: If you choose a dictionary or translation app on your device, the word is passed to that app. If you choose a website (such as an online dictionary, a translation site, or a web search), the word is included in the address opened in your browser, so that website receives it. Those apps and websites are not operated by us and are subject to their own privacy policies. We never receive what you look up.
Opening a source: Tapping the source of a word opens its saved URL in your browser.
App lock (Premium): The app uses Android's own fingerprint, face, or screen lock prompt. Your biometric data stays with Android; the app never receives 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, app version, and a random identifier for the app installation. This does not include your words, sentences, or other collected content.
ML Kit usage metrics: When you use translation or photo reading, Google's ML Kit may send Google technical metrics about how those features perform (such as device model, OS version, app version, and processing time). The text and photos themselves are not included.
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 an analytics service and does not access your device's advertising ID.

3.2 Information Stored Only on Your Device

Your collection: Words, meanings, readings, parts of speech, noun genders, example sentences and their translations, sources, tags, notes, decks, favorites, and the number of times you have met each word are stored in the app's storage on your device.
Your learning records: Review schedules, your answers, streaks, and statistics are stored on your device and are used only to run your reviews and show your progress.
App settings and translation data: Your languages, study and reminder settings, display settings, and any translation data you install are stored on your device.
Notifications and widgets: If you turn on reminders or Word of the Day, or add a widget, words from your collection appear in your notifications or on your home screen, where anyone who can see your device can read them.
Backups and exports you make: Backup, CSV, flashcard text, and PDF files go only where you choose to save or send them. Automatic backup, if you turn it on, writes one file a day to the folder you choose and keeps the latest 7. These files are not encrypted. Before a restore, the app keeps a copy of your data in its own storage so that you can undo the restore.
Android backup: If backup is turned on in your device settings, Android may include your collection and settings in the backup it saves to your own Google account, and may copy them to a new phone when you transfer your data. This is handled by Android; we have no access to it.
When you uninstall: Uninstalling the app or clearing its data deletes the collection, records, and settings stored in the app's storage. Files you have exported or backed up to other locations remain until you delete them.

3.3 Information We Explicitly Do Not Collect

Your words, meanings, example sentences, notes, sources, or review history
The text of the pages and books you read, or the contents of your screen or of other apps
The contents of your clipboard
Your photos
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
Your device's advertising ID

3.4 Permissions the App Requests and Their Purposes

Word Collector uses only a few permissions, and only for the stated purposes:

Notifications (POST_NOTIFICATIONS, Android 13+) — Shows review reminders, Word of the Day, and the optional notification for collecting from copied text. You can use collecting and review without allowing it.
Run at startup (RECEIVE_BOOT_COMPLETED) — Restores your reminders after your phone restarts.
Biometrics (USE_BIOMETRIC / USE_FINGERPRINT) — Used only for the app lock (Premium), to show Android's unlock prompt.
Google Play Billing (BILLING) — Lets you buy Premium and restores your purchase.
Internet and network status (INTERNET / ACCESS_NETWORK_STATE) — Used only for anonymous crash reports, Google Play purchase verification, in-app reviews and in-app updates, downloading translation data and text recognition models, downloading the list of our other apps, and showing this privacy policy in the app. Collecting words, card review, and statistics do not require an internet connection.

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

Word Collector uses the following third-party services. Each service has its own privacy policy.

Firebase Crashlytics (Google LLC) — anonymous crash diagnostic data
ML Kit Translation and Text Recognition (Google LLC) — on-device translation and reading text from photos; language data is downloaded from Google, and technical usage metrics may be sent to Google
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

We do not sell your data or share it with advertising networks.

6. Data Retention

Crash reports: retained for 90 days, then deleted.
Your collection, records, and settings on your device: kept until you delete them, uninstall the app, or clear the app's data.
Automatic backups: the latest 7 files are kept in the folder you choose; older ones are deleted automatically.

7. International Data Transfers

We are based in Japan. The infrastructure used for crash diagnostics and for 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. Because your collection is stored only on your device, we cannot view or delete it for you, but you control it directly. You can:

Edit or delete words at any time, or use "Delete all words" in Settings to erase your collection and records
Uninstall the app or clear its data to erase the information stored in the app's storage
Withdraw the notification permission in your device settings at any time
Contact us at the address below to make a request regarding the information we hold

9. Children's Privacy

Word Collector 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.

11. Contact

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

CloudEx Inc. (Japan)

Effective Date: November 1, 2026