I remember this app as well; “Flipreader” comes to mind but yields no Google results.
It was the peak of RSS for me, beautiful UX, customizable, all the posts in sequential order if I wanted instead of algorithms…
I remember it because useless when web publishers realized they were losing ad views to apps like these and all the posts became previews with links.
I believe you are thinking of Flipboard (still around, but a bit different nowadays).
I think you are referring to Flipboard, it is still in the AppStore
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