Trending Books Screensaver

Open Library is a project of the non-profit Internet Archive with the stated aim of one web page for every book ever published. Its catalogue was gathered from large library catalogues and individual contributions, and anyone can edit a record or add a missing book. It also lends digital copies of many titles through the Internet Archive and participating libraries, one reader at a time per copy.

The trending list is a different thing from the catalogue. Open Library has described its current approach as a z-score that compares a book’s activity over the last 24 hours with its activity over the last 7 days. Activity combines page views with reading-log events such as marking a book “Want to Read”, and a reading-log event counts for more than a page view. A book therefore rises when attention jumps above its own recent norm, not simply because it is popular in absolute terms.

That makes it a measure of attention on Open Library specifically. It says nothing about sales, library lending elsewhere or any bestseller chart, and a book with steady traffic can score lower than a modest title that suddenly attracts a burst of visits.