Placeit will cut your efforts in finding the perfect mockup design for your products! You can find a variety of free mockups and demo videos suitable for your marketing. You can get a paid subscription for more options like discounts on watermarked designs, logos, and videos!
MockUPhone is the app that allows you to put your design on an iPhone, iPad, Android phone or a TV screen and see how it looks. It simplifies the work of many developers, designers, consultants and project managers, so they can make a wonderful presentation of their product with the PNG files provided.