Yes, SleepScore Max requires a compatible Apple® or Android™ smartphone to function, such as:
Apple® smartphones: iPhone® 6, 6+, 6s, 6s Plus, 7, 7 Plus, 8, 8 Plus, X, X Max, Xs, Xs Max, 11, 11 Pro, 11 Pro Max, SE, 12, 12 Mini, 12 Pro, 12 Pro Max
Apple® operating systems: iOS 10.3 and above*
Android™ smartphones require Android™ operating systems: 6.0 and above
*iPhone® users, please go into Settings/General/About/Version to check your operating system