Print on Demand Apps are tools that allow merchants to sell custom printed products such as t-shirts, mugs, and phone cases without the need to hold inventory. These apps offer features such as customizable product pages, automatic order fulfillment, and support for various print techniques. With Print on Demand Apps, merchants can easily sell a wide range of custom printed products without the overhead and risk of traditional manufacturing and inventory management. Some Print on Demand Apps also offer integrations with popular marketing and design tools, making it easier for merchants to promote and create their custom printed products. By using Print on Demand Apps, merchants can offer a wide range of customizable products to their customers.