I don't have the app downloaded on my phone. I do save the emails with the coupons on them and use them that way. You just show the cashier the phone and they honor it.
Hobby Lobby accepts them the same way now... which is a step towards modern stores for them considering everything they do is rung up by hand. No scanners there. You have to make sure you get the discount that is advertised since they aren't scanned in....