All great stories begin with a child. One night, as I gently rocked my baby daughter to sleep after a long day, I decided to buy her a little something while she dozed off in my arms. With one arm cradling her and the other just able to reach my phone, I browsed online, managing single-handedly. But when it came to checking out, I hit a snag.

My one free thumb wasn't enough to smoothly navigate the checkout process. It was frustrating — the app's design didn't accommodate the reality of multitasking between caring for my child and completing a purchase.

I don’t need to tell you what that turned into...