What APK free offers?
A complete information about the Duolingo APK file you are downloading is provided before you download. The first thing you have to read is the antivirus report, given by more than 50 trusted and recognized antivirus, followed is to verify if the apk developer is the one you are looking for, in many cases the apps or games may have the same name but not be the correct developer.
You can also find latest Duolingo Apk versions available and system requirement needed to install it, and more technical information about the Apk file, you can download the apk installer for free, without packed, wrapped or any modification, apk file contain the signature of the official developers. You could also download Duolingo from another alternative website or from the official Android app stores like Google Play Store or Amazon Appstore, but maybe some apps or games could be not available there.