1. Hilton Honors: The Hilton Honors app allows guests to check in, choose their room, unlock the door, and control the room's temperature, lighting, and TV using the app.
2. Marriott Bonvoy: The Marriott Bonvoy app offers similar features, enabling guests to check in, select a room, and utilize the mobile key for room access.
3. InterContinental Hotels Group (IHG): The IHG app provides check-in, mobile key, and other features for participating IHG hotels like Holiday Inn, Crowne Plaza, and Hotel Indigo.
4. Hyatt: The World of Hyatt app allows guests to check in, use a mobile key, customize their stay preferences, and make room service requests.
5. Best Western: The Best Western Rewards app offers mobile check-in, room key access, and mobile checkout for a contactless hotel experience.
6. AccorHotels: The AccorHotels app provides mobile check-in, mobile keys, room service ordering, and other services for participating hotels like ibis, Novotel, and Sofitel.
7. Choice Hotels: The Choice Hotels app allows guests to check in, select a room, and use a mobile key at select Choice hotels.
8. Wyndham: The Wyndham app offers check-in, mobile key, and room preference selection functionality for participating Wyndham hotels.
These apps are usually available for download on the App Store (for iOS devices) and Google Play (for Android devices). They require guests to have an account with the respective hotel loyalty program and typically require guests to be within a certain distance from the hotel before the mobile key feature will work.