Creating a structure for your app, however, can take a lot of time and energy, unless of course, you have the right tool in place. That is why many mobile developers start out with a mobile app wireframing or mockup tool. Mobile app wireframes can not only help save valuable time (and money!) but also help developers focus on the user experience.
https://mopinion.com/mobile-app-wireframing-mockup-tools/
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