Today I found out, that there is a difference between using the Web Site Facer Creator (pictures at the left) and the Windows App (right) in output graphic quality - even if you use exactly the same components (picture files in PNG format). I duplicated one watch face design and modified it in the (almost) same way ones at the web site and ones in the windows app. It surprised me a lot when I got two (slightly) different watch faces at the end.
Here is, how does it look like in creator (one print screen; left is the web site watch face):
The same difference print screened from the facer.io:
And difference at the watch (left is the watch face created at the web site):
So, if you could choose, go for the Web Site Facer Creator version 
You will get better picture quality and the web version is also much faster (at least on my computer).
Here is the published watch face in original - please do not click at “Sun” icon twice without 
: