Aldiko Classic is based on Aldiko 3.x for users that would like to continue using the "classic" Aldiko experience:

- Support for EPUB, PDF and audiobooks as well as Adobe DRM (ACS)
- Support eBooks from public libraries.
- Fully-customizable reading experience
- Advanced library management system
- In-app catalog with both best-sellers and free classics (OPDS support)

A premium subscription is also available to unlock the following features:

- Disable all ads from the app
- Support for TTTS (Text To Speech)
- Support for highlights and annotations
- Detect Calibre catalogs on your local network