When comparing Cool Reader vs Aldiko Book Reader Premium, the Slant community recommends Aldiko Book Reader Premium for most people. In the question“What are the best eBook readers on Android?” Aldiko Book Reader Premium is ranked 10th while Cool Reader is ranked 12th. The most important reason people chose Aldiko Book Reader Premium is:
Aldiko offers a [free version](https://play.google.com/store/apps/details?id=com.aldiko.android&hl=en) of the app that features in app advertisements as well as less features. This allows users to try out the app in order to see how well it runs and if they like it in general.
Ranked in these QuestionsQuestion Ranking
Pro Fully customizable
Pro A wide range of formats supported
Cool Reader supports epub (non-DRM), fb2, doc, txt, rtf, html, chm, tcr, pdb, prc, mobi (non-DRM) and pml formats.
Pro Free and open source
Cool Reader is available completely free and is also open source.
Pro Free advertisement supported version
Aldiko offers a free version of the app that features in app advertisements as well as less features. This allows users to try out the app in order to see how well it runs and if they like it in general.
Pro Customizable reading settings
Aldiko supports many different reading options such as text alignment, text size, background color and brightness.
Pro Can be used to read Adobe DRM content
Aldiko Book Reader Premium supports Adobe DRM content that has been purchased from an assortment of eBook retailers that support downloads of Adobe Digital Edition versions of .epubs.
Pro Cloud storage
Aldiko offers users the option to store their eBooks on cloud storage sites such as Dropbox, which is great for users with low storage devices or multiple devices.
Pro In app eBookstore
Aldiko provides an online eBookstore within the app making for a pretty convenient experience for those that do not want to sideload and import their eBooks.
Con Could have a better UI design
Con Does not support DRM .epubs
.epubs with DRM are not supported by Cool Reader.
Con Page turning is slow
Compared to other popular eBook readers on Android the page turning animation/function is slow.
Con Heavy on resources
Noticeably slow on weaker devices compared to other apps on this list.
Con Recent versions have substantially more ads
Con Recent versions have brittle DRM loading
Adobe ACSM loading used to be rock-solid, but this has become brittle enough to simply not function on at least one device as of recent releases.