Medical imaging is cumbersome and expensive. But Butterfly iQ has shrunk ultrasound technology to the size of a chip, letting medical professionals simply plug the portable probe into their phone; peer at a patient’s heart, lung or growing fetus; and even diagnose diseases. At $1,999, plus a $35 monthly software subscription, the FDA-approved device is now used in more than 20 countries—many where imaging is lacking. —Mandy Oaklander
Buy now: Butterfly iQ