

Every Calibre forum I've seen has many threads from people complaining about this, and the devs saying "our system is better". I agree with OP that renaming files and forcing you to use folder structures are a massive problem. They are apparently only for output/conversion, but still make me nervous. It also has a bunch of image compression options with obscure names that I thought would trash my CBR/CBZ comics on import (MD5 checks and forum questions proved it's okay). Its built-in reader is very slow, and "Preparing ebook for first read" is not an encouraging message (often wondered what it's restructuring, compressing, etc.).
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It might not tamper with files enough to change their MD5, but I've been nervous a few times, as it has a tendency to rename formats (AZW > Mobi, KFX > zip file containing the KFX, EPUB > HTMLZ), or if you install certain plugins, formats will be converted automatically, unprompted (not usually a problem, though, as if you install these plugins, you know what to expect).
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If you have an Android eReader, Calibre doesn't play nice.Ĭalibre don't tamper with files unprompted. Its lack of folder support is a serious issue for me, too, even though I understand its tags system. TL DR I reluctantly use Calibre, because there's no alternative, eReader conversion is needed for Kindles, DRM, etc. You basically need Calibre if you use Kindle/Kobo/any non-Android eReader Works best in conjunction with Android eReaders. Not great for searching through, but works. Arrange books in folders, name them, use Everything to search for them, keep metadata in text/DOC files. Alfa eBooks Manager ( site seems to be down at the moment more bloated than Calibre, but at least it let you keep your folder structure).That said, KOReader seems to have some native support for Calibre libraries Calibre Companion seems kinda useless, and since getting an Android eReader, I've often wished I'd just stuck to folder structures. Quite complicated to use until you get used to it, rather slow due to Python codebase. Calibre forces you to organise your books by tags and lose your folder structures, good for searching metadata, converting for Kindle, stripping DRM, a swiss army knife.Ebook management software is rare, and I only know about:
