I'm currently creating a list for useful testing tools for my job. I'm searching for a tool which allows the tester to compare a screenshot of the planned design of an iOS app to a screenshot of the actual implementation. Does anybody know if a tool like this exists? If not how do you execute manual design tests? How do you make sure the pixels are correct and so on? I already searched the web but I had no luck to find a tool that helps me testing the design implementation. I'd really appreciate any help. Thank you in advance!