Zeplin currently only supports Sketch as a design tool, which is also Mac only. Using our Mac app (and our Sketch plugin) designers upload the designs. We also

Zeplin currently only supports Sketch as a design tool, which is also Mac only. Using our Mac app (and our Sketch plugin) designers upload the designs. We also have a web app (for developers not using Macs), where you can access the uploaded designs: app.zeplin.io