Cantonese Web EPUB is a browser app that adds Cantonese Yale or Sidney-Lau romanization to any Chinese website or EPUB. This app is tested on JW.ORG and the Watchtower Online Library (WOL) Chinese pages, but it is not affiliated with them. The annotation is performed by your device itself, so the app does not send your browsing through any third-party. To use this app, access to the site you wish to browse is required.

This app offers various features such as Pleco or Hanping integration, audio, 3 lines mode, bookmarks, highlighting and PDF export, change text size across all pages, and dark mode available on Android 10. The app is open-source, has no ads, and is of small size. It is also a clipboard viewer and can be used as a Share target or EPUB viewer. The page rarely needs to reload when switching back to the app, even in poor data connection situations.