Custom Web and mobile apps, once the exclusive purview of large companies with vast resources, have become a common hallmark of successful small and mid-sized businesses. Externally, apps can offer deeper engagement with customers through online and mobile access to useful tools and information. Internally, they can help workers communicate more effectively with highly customized real-time data on their desktop and mobile screens. But reaching the promised land of apps and money can be daunting, and not every app development adventure ends in success.