Both the SleepScore app and SleepScore Max are based on the same SleepScore by ResMed algorithm. This algorithm is based on over 12 years of world class software development and is always being updated and advanced based on over 6 million nights of sleep data and sleep norms. There may be a two to three-point score variation when the two are compared side by side due to variations in technology, but this should normalize and produce consistent trends over time. Rest assured, either method you choose to use is the most accurate non-contact way to measure your sleep outside of a sleep lab.