A tag delivery network is disclosed for delivering tags to collect analytics related to use of mobile applications. The tag delivery network may include multiple servers for communicating with mobile devices executing mobile applications. The mobile applications may be any mobile application that has been recompiled with, for example, a particular line of code and a static library. A recompiled mobile application may initiate a browser when executed by a mobile device. The tag delivery network may deliver a tag container to the browser. The tag container may load a bootstrap file which in turn may load one or more rule files and code files. These files may cause the mobile device to modify an appearance of the mobile application. The modification may be performed to carry out multivariate testing (e.g., A/B testing), content swapping, optimization of the mobile application, or personalization of the mobile application.