Tangentially related, but if any of you work with designers or are yourselves designers, please give Figma a try. It is identical to Sketch in so many ways, better in some others (particularly editing vectors and dealing with nested "symbols" or other components), and only falls behind in a few areas. If any of you have had to deal with the nightmare of keeping your design files in sync between designers forgetting to push changes to dropbox or InVision, or multiple designers working together and having their changes fall out of sync, the ability to edit and view the same document together cannot be overstated.