No official version – the original book publisher doesn’t sell a spreadsheet, so quality depends on who created it. Some contain typos, missing titles, or inconsistent years.
Editions matter – later editions drop ~200 books and add ~200 new ones. A good spreadsheet will note which edition each book belongs to; a bad one mixes them arbitrarily.
Minimal metadata – you won’t get plot summaries, reading guides, or author bios (fine for tracking, but you’ll still need Wikipedia or Goodreads).
Not a reading app – no reminders, social features, or ebook integration.