The best alternatives to Preview mini for iPhone and iPad are Zeplin, Sketch, and Avocode. If these 3 options don't work for you, we've listed a few more alternatives below.
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Save time on preparing design assets and specs and let Avocode do it for you. Just import any design file and invite developers to take everything they need for a Web, iOS, Android, or React Native app.
The Dico is a daily newsletter curated by developers for developers. We send daily notifications to help you discover new iOS frameworks. It’s a promise. View an example: http://thedico.com/example.html
Mirror is an app for real-time previewing Sketch on Android and saving your designs to your phone. It’s just simple and helps saving your time on designing.