Wave was born (no pun intended) during a real contraction my wife was having. When my wife was in labor with our child, the app she was using hit her with a subscription popup — right in the middle of a painful contraction. Then another popup when she tried to edit a start time. All while ads sat at the bottom of the screen. During one of the most intense experiences of her life, an app was trying to sell her something. That's why Wave exists. Just one affordable payment. No ads. No popups…