Any tools to check app designs

I'm looking for a tool where I would be able to almost 'inspect' the elements of an app build to make sure they match the design I created.

So currently my Devs will create a build using test flight and then I review it, but if they have slightly used the wrong font-weight or spacing then I have to do it by eye. Is there any tool that would allow me to see the code or the breakdown of elements on the app?