Sales Pop up & Social Proof is an all-in-one sales and marketing app for Shopify. It offers various tools to boost conversions, increase engagement, and attract new customers. The app allows you to add social proof by displaying recent sales and a visitor counter. It also includes features like sales popups, sold count to create scarcity, and promotional bars to promote campaigns and announcements. With the app's analytics, you can track performance and manage campaigns effectively.