Or Romania.

I agree on the outdated UI, but at least it gives you a ton of options that official apps would never allow you, or babysit you too much to offer.

I’ve literally used Calibre 2-3 times, and while the UI seemed daunting at first, it was logical and did did its job quite fast when figured out. And I usually don’t need to use it afterwards for another long period.

Good luck doing that to my 2012 5th gen Kindle that’s been off the update schedule for an eternity.