Read at LogRocket Blog
Figma Mirror is an app launched by Figma for iOS and Android devices, allowing designers to view their Figma designs on mobile or tablet. It helps with testing the design during the process and allows designers to see the exact size and interactions on a real device.
With the app, you can see the exact design in actual size and on a real device. It will help you test component sizes, for example, buttons or checkboxes, and also check the feeling of the app and the interactions between the screens.