Screenshot system compare

Create an application that makes possible to do a print screen and compare with an image pre-storage. We have 3 people that execute hundred manually task... they do a print screen of each step executed. We need to create an application able to register the step-by-step and save that. That pre-storage step-by-step pictures should be used as the reference to compare with the operator is doing now. The comparison will happen in parallel... When some its difference of expected a red icon should appear on the bellow right corner when windows or in-kind system status in ios for example. I would like to use electron js.