stmpr is a digital stamp-card and customer-loyalty system for local businesses, including cafés, bakeries, restaurants and beauty salons. It replaces paper stamp cards with branded cards saved in Apple Wallet or Google Wallet. Customers join by scanning a QR code, without installing an additional stmpr app. Businesses customise their card with their logo, colours and stamp icons, choose the number of purchases or visits required for a reward, and issue stamps using staff smartphones. Customers can see their progress towards the reward on the card. Depending on the plan, businesses can use push messages, automated reminders, multiple programmes and staff accounts, and statistics on customer activity and redeemed rewards. Businesses can find their own location and start designing a card at https://stmpr.io/start.