I have been using Sketch for a long time and been really happy with its native Mac performance. However, one of the problems between dev and designer was the handoff. I used tools like Zeplin but again it was just too much of a ask for designer to upload the Sketch file to another tool for just learning the pixels and color codes. I think this update is huge for simpler and more frequent use cases. I believe Zeplin could still fix a couple of problems but from this update, it looks like Zeplin is now a feature of Sketch.
Sketch launched Cloud Inspector in beta and bringing developer to Sketch for free. Here’s what’s in the beta and what’s coming next.
Source: Introducing Cloud Inspector — free developer handoff in the browser
Mahmut Canga 
What do you think?