APK on one market had to be found, so that deduplication can happen before downloading apps. While reducing the load we incur to markets’ web servers may not seem strictly necessary to the objective of collecting apps, it vastly reduces the likelihood of being banned by market owners and hence, helps building and maintaining in the long term a large and up-to-date dataset.

This article is an extended version of a data paper entitled “AndroZoo: Collecting Millions of Android Apps for the Research Community” published at the International Conference on Mining Software Repositories (MSR) 2016. In this extension, in addition to collect Android apps for the research community, we further provide to the research community various metadata of Android apps. The main idea behinds this extension is to facilitate the access of our AndroZoo app set. Indeed, based on the feedback collected from AndroZoo’s users, we observe that the main bottleneck of analyzing the whole AndroZoo app set is the bandwidth. A lot of time and resources are needed in order to access all the available AndroZoo apps. However, since some apps in AndroZoo may not be necessary for certain analysis (e.g., sending apps that have no reflection access to 