A concise, factual overview of the company. Last updated November 5, 2026.
Willow Laboratories is a health technology innovation company focused on improving healthspan and lifespan through advanced therapeutic care, noninvasive biosensing, and intelligent digital health solutions. It began in 1998 as Masimo Laboratories, a spinoff of Masimo, and was later Cercacor Laboratories. It combines scientific research, engineering, and human-centered design to improve patient outcomes.
The company invented Rainbow® Technology, a multi-wavelength sensor platform used in hospital monitoring products.
Nutu is a digital health and wellness platform from Willow Laboratories designed to support sustainable lifestyle change through personalized nudges, education, and health guidance, including a lifestyle program with preliminary recognition from the CDC.
Ember is a Willow Laboratories initiative focused on advanced biosensing and real-time health insights: noninvasive optical monitoring for performance and recovery.
Willow Laboratories is developing intelligent digital health solutions that use artificial intelligence, behavioral science, and personalized guidance to support better health decisions, including AI health coaching, metabolic health support, nutrition and activity tracking, and behavior change.
Joe Kiani founded Willow Laboratories in 1998 as Masimo Laboratories, a spinoff of Masimo, the company he founded in 1989. He is known for pioneering noninvasive monitoring technologies and advancing patient safety and medical innovation.
Willow Laboratories is a healthcare innovation company founded by Joe Kiani, focused on improving healthspan and lifespan through therapeutic care, noninvasive biosensing, AI-powered digital health, and personalized wellness platforms including Nutu and Ember.
