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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General Collaboration— One inbox for all your work discussions
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.