The medical app market was worth $489 million in 2015 and nearly 40 percent of sales came from health monitoring apps, according to a report from research firm Kalorama Information.

Kalorama includes telemedicine and monitoring apps in this app category.

"Involvement in this care segment has several benefits and hospitals, care givers, device manufacturers, and patients are continuing to jump on board with acceptance and using this technology," Bruce Carlson, publisher of Kalorama Information, said in a statement.

Kalorama says the most common types of medical monitoring apps are ones that track diabetes and heart conditions. The research firm adds that other areas also show widespread adoption including tracking behavioral and mental health, cancer, respiratory disorders, pain, and obesity.

Earlier this year, Kalorama reported the global advanced patient monitoring market was worth about $31.4 billion. The company added that the patient monitoring market has benefited from the demand in major healthcare facilities and home treatment markets to move to a wireless system.