Privacy Policy

CloudEx Inc. ("we", "us", or "our") operates the "Classic Audiobooks" app (the "Service"). This Privacy Policy explains what information the Service handles, where it goes, 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

Classic Audiobooks plays public-domain audiobooks recorded by LibriVox volunteers and shows the text of the book from Project Gutenberg or Aozora Bunko, lighting up the paragraph being read. There is no account and no sign-up. Your library — what you listen to, where you stopped, your bookmarks and notes, and the words you save — is stored only on your device. We never collect it, and it is never sent to us; we do not run any server that receives it. Specifically, we have no access to:

  • The books you play, search for, download, or finish, or your listening progress and listening time
  • Your bookmarks, notes, and favorites
  • The words you save, together with their sentences, meanings, and notes
  • Your name, email address, or phone number (unless you email us yourself)

2. Where the Books and Recordings Come From

To play a book and show its text, the app downloads them directly from the following public-domain sources. These requests contain only what is needed to fetch the item (such as the book's ID or the file name) and no personal information. As with any request to a web server, the server receives your device's IP address and the standard information included in every web request.

  • LibriVox (librivox.org) — the list of chapters and the description of each book
  • Internet Archive (archive.org) — the audio files (MP3), book information, and cover images
  • Project Gutenberg (gutenberg.org) and Aozora Bunko (aozora.gr.jp) — the text of each book

These are independent projects that we do not operate, and their own privacy policies apply to the requests they receive. The catalog (titles, authors, languages, and genres) is built into the app, so browsing and searching it happens on your device. Chapter lists, book texts, and covers are kept on your device after they are first fetched, and chapters you download for offline listening are stored on your device.

3. Information We Collect

3.1 Information We Receive

  • Crash reports: Via Firebase Crashlytics (Google). When the app crashes, it sends the technical details of the crash (stack trace), the device model, OS version, and app version, and an identifier that Crashlytics assigns to this installation of the app. We use this only to find and fix crashes. It does not include your library, your saved words, or what you listen to.
  • Purchase information: Payment for Premium is completed on Google Play. The app checks your purchase with Google Play to unlock Premium and remembers the result on your device. Google Play provides us with order records (such as the order number, date, and amount), which we use for refunds and support. We never receive payment details such as card numbers.
  • List of our other apps: To show our other apps, the app downloads a list of them (names, descriptions, and icons) from Cloudflare Pages (cloudex-sister.pages.dev). The request contains no information about you; as with any web request, the server receives your device's IP address.
  • When you contact us: If you email us (for example, from "Contact us" in the app), we receive your email address and your message. The email the app prepares includes the app version, Android version, and device model, which you can see and remove before sending. We use this only to reply to you.

The app does not include Google Analytics, Firebase Analytics, or any other usage-analytics tool.

3.2 Information Stored Only on Your Device

  • Your library: The listening position in each book, bookmarks and their notes, favorites, books you have finished, and how long you listened each day.
  • Saved words: Each word you save, with the sentence it appeared in, its place in the recording, and the meanings and notes you add.
  • Settings: Playback, sleep timer, reading screen, and review settings, and whether Premium has been purchased.
  • Downloads and cached content: Audio you download for offline listening, and the chapter lists, book texts, and cover images the app has fetched.

3.3 Backups

  • Android backup: If backup is turned on in your device settings, Android may include your library, saved words, 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. Downloaded audio is not included. This is handled by Android according to your backup settings; we have no access to it.
  • Backup file: In Settings → Data → Back up, you can save your progress, bookmarks, and words as a JSON file in a place you choose (such as Google Drive or your device's storage), and restore it later. The file goes only where you save it; we never receive it. You manage and delete it yourself.

3.4 Dictionary, Translation, and Read-Aloud

  • Looking up a word or translating a paragraph: Only when you choose to, the word or paragraph you selected is passed to the dictionary or translation app on your device, or to the website you pick (such as Google Translate, Google Search, Cambridge, Merriam-Webster, Oxford, Wiktionary, Weblio, Eijiro on the Web (ALC), jisho.org, Naver, or Youdao). The privacy policy of that app or website applies to what it receives. The app does not send the text anywhere else.
  • Read-aloud: Words and sentences are read aloud by the text-to-speech engine on your device. The app does not send them to us.

3.5 Information We Do Not Collect

  • Your name, email address, phone number, or contacts (the app has no account or sign-up)
  • Your location
  • Your library, listening history, bookmarks, notes, or saved words
  • Sound from your microphone or images from your camera
  • The contents of other apps, or your browsing history

3.6 Permissions the App Requests and Their Purposes

  • Internet (INTERNET) — Fetches chapter lists, audio, book texts, and covers from the sources in Section 2, and is used for Google Play purchases, in-app reviews and in-app updates, crash reports, the list of our other apps, and showing this privacy policy in the app.
  • Network status (ACCESS_NETWORK_STATE) — Checks whether you are on Wi-Fi, so that downloads can be limited to Wi-Fi if you choose.
  • Foreground service for media playback (FOREGROUND_SERVICE / FOREGROUND_SERVICE_MEDIA_PLAYBACK) — Keeps a book playing while the screen is off or you are using other apps, with playback controls in the notification and on the lock screen.
  • Foreground service for downloads (FOREGROUND_SERVICE_DATA_SYNC) — Keeps downloads of audio running in the background.
  • Notifications (POST_NOTIFICATIONS, Android 13+) — Shows download progress and the playback controls. You are asked when you start a download, and you can turn notifications off at any time.
  • Keep awake (WAKE_LOCK) — Keeps playback going while the screen is off.

The app does not request access to your location, camera, microphone, contacts, or files, and does not use accessibility services. The "shake to extend" option of the sleep timer (Premium) uses the device's motion sensor only while the sleep timer is running, to notice a shake; the motion data is not recorded or sent.

4. How We Use Information

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

  • Providing the Service (fetching books, recordings, and texts)
  • Unlocking Premium and handling refunds
  • Diagnosing and fixing crashes
  • Responding to your inquiries
  • Complying with applicable laws

We do not sell or rent information to anyone.

5. Third-Party Services

Classic Audiobooks uses the following services. Each has its own privacy policy.

  • Firebase Crashlytics (Google LLC) — crash reports
  • 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 list of our other apps
  • LibriVox, Internet Archive, Project Gutenberg, and Aozora Bunko — the sources of the recordings, texts, and covers (Section 2)

6. Data Retention

  • Crash reports: kept by Firebase Crashlytics for 90 days, then deleted.
  • Emails you send us: kept for as long as needed to answer them and handle any follow-up.
  • Data on your device: kept until you delete it in the app, uninstall the app, or clear the app's data.
  • Android backups and backup files you save: kept according to your Android backup settings, or until you delete them.

7. International Data Transfers

We are based in Japan. Crash reports are processed by Google, the list of our other apps is hosted by Cloudflare, and the book sources are operated in various countries. When you use the Service, the limited information described above may be processed outside your country of residence.

8. Your Rights and Choices

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

  • Delete bookmarks, words, and downloads in the app at any time, or uninstall the app or clear its data to erase everything stored on your device
  • Turn off Android backup in your device settings, and delete backup files you have saved
  • Turn off the app's notifications in your device settings
  • Contact us at the address below to make a request about the information we hold

9. Children's Privacy

Classic Audiobooks is a general-audience app for classic literature and is not designed specifically for children. The app does not collect personal information from anyone, including children. If you believe a child has sent us personal information (for example, by email), please contact us and we will delete it promptly.

10. Changes to This Policy

We may update this Privacy Policy from time to time. The latest version is always published at this URL together with its effective date.

11. Contact

For questions about privacy or requests regarding your information, please email us at .

CloudEx Inc. (Japan)

Effective Date: November 4, 2026