Neurodegenerative diseases affect about 7 million people in the U.S., with cases expected to increase. This Spotlight covers cognitive assessment apps and wearable sensors designed for home use. They can collect data on patients' cognitive and motor abilities and help detect symptoms of Alzheimer's and other neurodegenerative diseases. Doctors can use data from these tools to diagnose diseases earlier and more accurately, and these tools can reduce the number of clinic visits for patients. But, some patients may not have access to smartphones or other technology required to use them, and apps that collect health data raise privacy concerns.