Easily catalog books
on your phone or tablet

I have used it for several years and recorded my library of 5000+ books.

Amazing app. I have a huge collection and recently inherited more from a prominent person in my community and this app made cataloging everything, even the rare items with no online presence, a breeze. I've been blasting through piles of books in record time, tagging, sorting, and copying to their cloud.

If you have a home library that is outgrowing your memory, do yourself a favor and download CLZ Books immediately. I have tried countless cataloging apps, spreadsheets, and site-based trackers over the years, but nothing touches the speed, depth, and sheer brilliance of this app.
Why It’s in a League of Its Own:
Lightning-Fast Scanning: The barcode scanner is a marvel. You can literally walk down your shelves, scan one book after another in rapid succession, and watch your digital library build itself in real time. It rarely misses a beat, even on older or international editions.
Impeccable Database Accuracy: CLZ’s core database is incredibly robust. It doesn't just pull the title and author; it fetches high-quality cover art, publisher details, publication dates, page counts, and genres. For older books without barcodes, the manual search by ISBN or author is smooth and highly accurate.
No More Duplicate Buys: The absolute best feature for any serious book lover is the instant duplicate warning. If you’re at a used bookstore or an estate sale and can’t remember if you already own a specific edition, one quick scan tells you exactly what’s on your shelf back home. It has saved me money and shelf space more times than I can count.
Seamless Cloud Syncing: The app syncs flawlessly with the CLZ Cloud. Whether you are checking your collection on your phone while out, organizing on an iPad on the couch, or managing a massive collection via their optional web version (Book Connect), everything stays perfectly in lockstep.
Deep Customization: It allows you to track whatever matters to you—loan statuses, reading progress, purchase dates, condition, and even custom tags or storage locations (e.g., "Living Room Shelf A").
The Bottom Line
CLZ Books is clearly built by collectors, for collectors. It turns the daunting, tedious task of inventorying thousands of books into an incredibly satisfying, addictive weekend project. The interface is clean, the performance is rock-solid, and the development team is constantly rolling out meaningful updates.
It is worth every single penny of the subscription. Highly, highly recommended!

Over 1200 books indexed

This is by far the best book library on apple. So easy to add books to library and lots of options to get your library organised the way you want. Worth the subscription!

CLZ Books is an app I have used for several years to keep track of my library. It keeps track of and will search all of the relevant data. I find it easy to enter data into, even data about books that are unusual, such as facsimiles of ancient manuscripts. My only complaint is that it cannot read my mind and warn me that I am thinking about a book already in my library. It is my failure to check this app that has had me purchasing duplicate copies that I already own. So I recommend it - and I recommend checking it before you purchase a book.

I’ve used CLZ Books (and Music) for years. It’s the simplest way I’ve found to keep track of my collections. The camera driven ISBN scanner is brilliant. And in the rare case it doesn’t find the book I’m adding, the manual entry method is easy to use as well.
Don’t let ‘simple’ put you off though. The app allows you to filter as many ways as you can imagine. Its ability to track books series is excellent and extremely useful for me.
Highly recommended.

Just moved about 4000 entries from the now discontinued “Readerware” and the move could not have been easier using the CLZ tool. Effective concept of Core Collection is well considered. More to come as I explore.

Just keeps getting better. I love it and have recommended it to many people.

Over the years, I have used several database applications to catalog my collection of books. CLZ Books has joyfully surpassed each of them. I am completely satisfied with its intuitive look, feel and ease of use. I would highly recommend it to anyone looking to keep track of their personal library.