A mobile application migration service is usable to receive recommendations for replacement and/or alternative mobile applications for potential mobile device upgrades. Additionally, the service may be usable to compare legacy mobile applications to potential target mobile applications and simulate operation of selected target applications on a new target device. Further, a service may be usable to provide one-click purchase of one or more target applications, one-click installation of the selected target applications, and/or one-click migration of associated user and/or application data from a legacy device to a new device. Such recommendations, comparisons, simulations, and one-click migrations may be used to facilitate migration from one mobile device to another, even when legacy devices are customized with highly useful and/or often used applications.