This document discusses practical and legal considerations for mobile apps. It notes that apps are increasingly omnipresent and important, but also increasingly scrutinized. The purpose, functionality, and platform of an app are important to understand its legal issues. Development plans and agreements should address ownership, IP protection, specifications, support and more. Terms of service and privacy policies must be implemented properly. Content may be owned, third-party, or user-generated and is subject to copyright law. Apps may be regulated in unexpected ways, such as for data privacy, security, and health. Transparency in an app's data practices is important to establish trust.