Effective date: 18 September 2026
Omnibook is an e-book reader for Android. This policy describes what it does with your data. The
short version: **Omnibook does not collect, store, transmit, or share any personal data.** It has
no account system, no servers, no analytics, no advertising, and no network access.
You choose which files or folders Omnibook may read, through Android's own file
picker (the Storage Access Framework). Omnibook can read only what you have pointed it at, and it
never asks for permission to read all files on your device. Your books are read in place and are
never modified, uploaded, or copied elsewhere — with two exceptions you control: if you ask
Omnibook to *delete a book from your device*, it deletes that file after you confirm; and if you
ask it to *save a highlighted copy* of a PDF, it writes a new file to a location you choose.
If you choose a font folder, Omnibook reads the font files in it to display books.
When you look up a word, Omnibook hands that word to the dictionary app you
chose, installed on your device, using Android's standard app-to-app mechanisms. What that app
does with the word is governed by its own privacy policy. To offer you the choice, Omnibook checks
which dictionary apps are installed; it does not record or transmit that list.
Omnibook keeps, in its own private app storage on your device only:
- your library: which files you added and their titles, authors and cover images;
- your reading position, bookmarks, highlights, and drawings for each book;
- your settings (font, theme, dictionary choice, and similar);
- a search index and, for scanned documents, the text recognised from page images, so a book is
processed only once.
For scanned PDFs, Omnibook recognises text from page images so they can be searched and selected.
This happens entirely on your device, using recognition models bundled inside the app. No image
or text is sent anywhere.
Omnibook does not connect to the internet. It declares no network permission, so the Android
system prevents it from doing so.
Omnibook requests no runtime permissions. Access to your files is granted per file or per folder
through the Android file picker and can be revoked at any time by removing the folder in
Omnibook or by uninstalling the app.
Omnibook offers paid features, purchases are handled by Google Play Billing. Omnibook receives
only confirmation that a purchase was made; it never sees your payment details. Google's handling
of payment information is described in Google's privacy policy.
Omnibook does not collect personal data from anyone, including children.
If this policy changes, the new version will be published at the same address with a new
effective date.
Questions about this policy: sanktionen@protonmail.com