Decent, but doesn’t quite work as advertised

The app description says Sketch Mirror will automatically scale your artwork up or down to fit your device width, but it does not do that. Tested on iPhone 6+ and Sketch Version 3.2.2 (9983). Mirroring an iPhone 5 sized artboard does not automatically scale up to fit the iPhone 6+’s screen.

Also, screen update is pretty slow over wifi and unreliable.

It will sometimes stop updating and you have to crash/restart the App.

It should scale artwork up to the device width, so you can easily scroll up and down to view the height. It will only do this when it’s viewing an artboard with the save native resolution as the device. Howeever, once you pinch to zoom all that is lost and it doesn’t resize itself correctly.

Needs much more work.

A. C. Anderson about Sketch Mirror, v1.2.1