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I think the few decent ones for iOS are listed on this site. Obviously hyperbole. Some are the same name as ones on Android that mostly work. Android may have nearly 100 ePub apps, I didn't count them, but maybe 1/2 dozen are really good.
Android:
Some totally ignore Publisher CSS, some people like that.
Some need paid version for annotation or some other feature. May be better than ad supported if it's good.
One I used to use now requires the an Adobe ID before you can us it at all.
Some "import" the books to somewhere, fine if it's your only library but backup can be tricky and that doesn't work sensibly for Calibre.
While there doesn't seem to be a huge number of ePub apps for iOS, certainly the main user preferences are covered. Mostly iOS needs a host application (as do some/most/all? Sony PDF digital paper readers) or even Apple cloud. I had to install the Apple client on an old Win7 game PC here to be able to use the media player. Linux CAN access the internal storage, but the built in media player only recognises music loaded via Apple's host program. Sadly I was given the iPhone 4s 32 Gbyte just after most Apple Store / iTunes apps no longer supported it, so I was unable to install VLC or other 3rd party applications that can access files copied direct via USB.
So as long as the iThing running iOS isn't too old, you can install Amazon's Kindle App and a variety of 3rd party epub readers, some of which can use directly loaded files via USB if you have suitable drivers for your OS.
Apple is a walled garden. But you are not limited to Apple applications or Apple music or Apple books or photos and documents only via Apple. Install suitable 3rd party apps while your iPhone, iPod or iPad is still fully supported.
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