The app was created by Jeff Dachis, a co-founder of Razorfish, and launched in the App Store in April 2015. It allows diabetics to keep a running log of their personal insulin levels, the effectiveness of their medication, what they recently ate, and what types of activities are affecting their blood sugar on a daily basis. One Drop is based in New York and was incorporated in 2014. The One Drop app brings affordable, accessible self-care to every person with a smartphone, as well as their insurers, employers, and healthcare providers.