The best alternatives to 360mockups are lstore.graphic, KK UI Store, and Device Shots. If these 3 options don't work for you, we've listed a few more alternatives below.
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Device Shots is a small web app that works as a tool to help you generate high-resolution device mockups with the screenshot of your website or mobile application, for free.
A complete guide for Apple displays. With information like Display Properties, Safe Areas, Widget sizes, Notch sizes and more. Go ahead and add it to your Dock!