There’s an android app called OpenLip. [1]

Description:

Openlib is an open source app to download and read books from shadow library (Anna’s Archive). The App Has Built In Reader to Read Books.

As Anna’s Archive doesn't have an API, the app works by sending requests to Anna’s Archive and parses the response to objects. The app extracts the mirrors from the responses, downloads the book and stores it in the application's document directory.

Note : The app requires VPN to function properly . Without VPN the might show the captcha required page even after completing the captcha

Main Features:

Trending Books

Download And Read Books With In-Built Viewer

Supports Epub And Pdf Formats

Open Books With Your Favourite Ebooks Reader

Filter Books

Sort Books

[1]: https://f-droid.org/de/packages/com.app.openlib/