Pretty darn good for version 1 – Exify - Tools for Photos Review

I've purchased several apps in the past that allowed you to view metadata for photographs, but Exify goes way beyond that. Histograms, location data with maps, and even the ability to edit metadata and add watermarks. This is version 1 so there are some bugs. The biggest is that Exify currently doesn't play well with iCloud photo library. If you have it set to upload your originals and "Optimize iPhone Storage" Exify won't be able to open your photos, and may crash if you try. This is very annoying but there is a workaround. If you open the photo in the Photos app first this will download it from iCloud. (and if you select the heart icon and make it a favorite the photo won't be removed from your device in the future) Hopefully the developer will fix this soon. There's also one odd design choice; the Exify app can only VIEW metadata. You have to open an image in the Photos app, choose edit and select Exify in order to EDIT metadata. Hopefully they'll add this feature to the app itself in the future.
Review by Mountainstudio on Exify - Tools for Photos.