I really like the idea, even the ISBN search works. However, I noticed that when I search for Nietzsche, for example, not all of his works are listed. I asked

I really like the idea, even the ISBN search works. However, I noticed that when I search for Nietzsche, for example, not all of his works are listed. I asked myself: Which book databases does the application use? And what are/were the challenges? From my own experience (e.g. application that digitizes the offline book stock) I had a hard time finding open book databases that are well maintained and complete. IIRC at the time google and open library was the best solution besides some commercial ones. In general, I have to say: I'm a bit lazy when it comes to choosing books. So when I'm not sure what to read, I just email my bookseller and ask for recommendations. The nice thing is, I don't have to name an author or title. They know me. If I decide to order a book, I just send them another email (maybe I can use your app to send them the ISBN and correct Title and Author). They then let me know when the book has arrived in the store and I pick it up. Sometimes I browse through the books in the store, or ask for recommendations. Another way I get book recommendations is through friends. Over lunch, we talk about what we've just listen to or read. And I have to admit that I listen to 2-3 audiobooks a month, the app gives me recommendations. I've also thought about exporting my data from the audiobook app and letting AI give me recommendations. But at the moment I've bought more books than I bought time to read them.