There's a sweet spot for people managing their diabetes. It's known as Time in Range (TIR) and, in contrast to A1C, TIR is the time each day a person spends in their target glucose range. A1C is a rolling 3-month average. And TIR is the result of the growing adoption of continuous glucose monitoring systems, including the FreeStyle Libre system of CGMs. There's more good news: Recent data1 show people who use a smartphone app with their FreeStyle Libre system spend more time in range than with just a reader alone.