The fastest margin calculator — on your wrist or in your pocket. Enter any 2 values (Cost, Margin %, Revenue, Profit) and MarginMate instantly calculates the other 2. No steps, no menus, no friction. Apple Watch + Digital Crown — fine-tune values with the crown, one unit at a time. Your margin in seconds, without touching your phone. ✦ Margin or Markup mode ✦ Dated history with one-tap restore ✦ 0 to 4 decimal places ✦ One-time purchase — no subscription, no ads