If you use Calibre, your library is almost certainly in better order than your kitchen. Tagged, deduplicated, converted into three formats you may one day need. The one thing that meticulous shelf will not do is read any of it back to you in a voice you would willingly listen to for nine hours.
This is not a criticism. Calibre is a superb library manager, it is free, and it has been quietly maintained for longer than most companies last. Cataloguing is what it is for, and it is very good at it.
Its viewer does have a basic read-aloud option, but it leans on whatever text-to-speech voice your computer happens to have installed. That is the flat, mechanical one. Fine for checking a paragraph, difficult to live with for a whole novel.
PhonoLeaf does not plug into Calibre directly. It connects to a Google Drive folder, so bridging the two is one extra step rather than an ongoing chore: copy or sync the folder Calibre keeps your books in to Drive, then connect that folder once.
After that it looks after itself. Anything Calibre adds to the folder later turns up in PhonoLeaf without being asked, so this is a setup task rather than a habit.
Calibre libraries collect books from all sorts of places, and some of those may still be DRM-protected. PhonoLeaf opens DRM-free EPUBs only, exactly like any other reader without the publisher's key.
Not directly. PhonoLeaf connects to a Google Drive folder, so getting a Calibre library in takes one bridge step: copying or syncing your Calibre folder to Drive.
PhonoLeaf reads a book's own embedded EPUB metadata and cover straight from the file, so covers and titles generally appear correctly with no extra step.
PhonoLeaf only opens DRM-free EPUBs. Protected books will not work, the same as in any other reader without the publisher's key.
No. Once the folder is connected, anything added to it later appears in PhonoLeaf automatically. It is a one-time setup rather than an ongoing chore.
Seven days free, and one folder to point at.