In addition to OpenAPS, another system called Loop is now available. And yet, this is the only way it can work—for now.By the time Boss decided to try looping, he had not gotten a good night’s sleep in a decade. To start looping with OpenAPS, Boss did also need to buy a mini computer called an Edison. The Edison receives data wirelessly from his continuous glucose monitor, runs an algorithm to predict future blood sugar, and tells the insulin pump how much to dispense every five minutes to prevent highs and lows. “That burden of having a dangerous low in the middle of my night completely disappeared.”The looping algorithm makes these corrections throughout the day too. With Loop, all I’m trying to do is get the dart on the board,” explains Erik Douds, who also uses Loop to manage his type 1 diabetes.Users of Loop have to carry around an extra device called the RileyLink (in white) that translates the iPhone’s signals to the Medtronic insulin pump and vice versa.