Slap Alert watches your Stripe, Paddle, RevenueCat, Polar or Dodo Payments account with a read-only key, and Shopify orders by webhook. For every sale, a pixel monkey in the menu bar slaps a sticky note on your screen with who paid and how much, and a win card marks your first sale and each milestone. App Store sales arrive as one note each morning, and your keys stay in the Mac’s keychain.