By now, most hotels offer a mobile app that, at the very least, lets you check in and check out. But the most innovative hotels offer evolved apps that do much more, from requesting amenities to making dinner reservations.

For high-end properties, mobile apps and devices allow for the continuation of seamless service – a virtual butler picking up where the real one left off. For limited-service budget properties, mobile apps let these hotels deliver service without increasing staff or spending a lot of money.

“Technology allows us to distribute our content, while enhancing guest services,” Aaron Stenhoff, vice president of Marketing and Digital at Red Roof Inn, tells us recently. He says things like apps and Wi-Fi help limited-service hotels like his deliver services customers want, without having to invest in costly infrastructure.

Whether it’s a budget hotel or luxury, five-star palace, the industry is continuing to rely on mobile devices and apps to help cater to a new generation of travelers. Here are a look at some that have been implemented.