"This is great! Albeit, there's certainly plenty of ways or tools out there that one can use to "preview" their site on various OS's and devices.... but the interface here definitely feels the most logical and intuitive. With a just a few minor UI/UX tweaks here and there and I'd say you've got a winner. Especially with the "Synchronize Scroll" and "Find Differences" features. Nicely done!"
Ethan Frame, Product Hunt