Calibre is for full computers: Windows, MAC or Linux (they also have Intel/AMD architecture processors)
There are folk who have made Calibre run on ARM by doing their own compile (calibre is open source)
Calibre can put some really heavy demands on a computer (conversion):Processor, RAM and storage.
Tablets aren't there yet (This was the case for Laptops 20+ Y ago).
Calibre Companion is a closely linked tool between Calibre on you desktop and your (Android or IOS) portable device.
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