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Are you taking about a mobile app or a desktop one ?

On desktop (Windows) I'm partial to ACDsee but I didn't test many.

I think Adobe Lightroom could be a good fit too.

I can't say for mobile, I really prefer to use a desktop.

Thanks for the recommendations! Either mobile or desktop is what I had in mind. The functionality required would be pretty simple ideally, just a few static buttons and a photo viewing area as a bare minimum. While I prefer desktop in general I could see myself using this type of program on mobile if it were the better option.

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