Book tracking/library apps

Hello folks. I’ve been using Book Crawler for years but it seems to have broken and it’s not on the Apple App Store so I assume it’s defunct. So I’m looking for recommendations for a new app, especially one which can accept a bulk upload (from a csv file or book crawler database), and ideally one that is accessible from a laptop/website as well as iPhone app. I’m not bothered about reviews etc, I just want to track what books I own so I don’t get confused and make repeat purchases. Thanks