Not perfect, but really handy
This app/ system is far from perfect. But its really handy as you can see the change as it looks on a device immediately, instead of having to export it as a picture and transfer it to your device. Saves a lot of time, and makes the entire app design process a lot more smooth.
Sadly it lacks in features and stability, but its a step on the right track.
However I think its unfair that we have to pay $5 for it, after weve already paid $99 for Sketch itself. It should be part of the "package", and therefore available for free to use.
Alekplay about
Sketch Mirror