Book Database Software

Catalog your book collection

Keep track of your book collection and wish listUse the mobile app or the web-based software (or both!)
Automatic book details and cover imagesJust search our huge online book database by ISBN
Over 40 million ISBNs recognizedGuaranteed 97% success rate on your ISBN searches!
CLZ Books icon CLZ Books
Mobile
Mobile app for your phone or tablet
iOS & Android
example
USD $19.95 per year
More about the mobile app
CLZ Books icon CLZ Books
Web
Web-based software for your computer
Windows & macOS
example
USD $39.95 per year
More about the web app
CLZ Books
Mobile + Web
CLZ Books Mobile
1 year
+
CLZ Books Web
1 year
USD $0.00
USD $0.00
save USD $0.00

Or... use them both,
as perfect companions!

Both CLZ Books Mobile and CLZ Books Web can be used on their own, as a stand-alone solution. But these tools really come to life when used together, as they are great companions. While away from your computer use CLZ Books Mobile on your phone, then use CLZ Books Web at home, to work on your database on a big screen, with a real keyboard. Of course, you can sync your database between them through our CLZ Cloud solution.

Latest software updates

Jun 24, 2026
My Go-To For Years
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.
JD8459 (USA) on CLZ Books Mobile

Reviews from customers

Jun 27, 2026
Amazing app
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!
rb9933 (USA) on CLZ Books Mobile
Jun 27, 2026
Truly wonderful
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.
The Abyss on CLZ Books Mobile
Jun 27, 2026
It does all I need
I have used it for several years and recorded my library of 5000+ books.
paul douglas on CLZ Books Mobile
Jun 26, 2026
Joy to use
Over 1200 books indexed
Paul Bastow on CLZ Books Mobile
Jun 26, 2026
Best out there
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!
The rollerball (United Kingdom) on CLZ Books Mobile
Jun 26, 2026
Exceptionally good app
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.
phdavids (USA) on CLZ Books Mobile
Jun 24, 2026
My Go-To For Years
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.
JD8459 (USA) on CLZ Books Mobile
Jun 22, 2026
Smooth Transition From Readerware
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.
CT Dad of Three (USA) on CLZ Books Mobile
Jun 18, 2026
This is the very best app for book collectors
Just keeps getting better. I love it and have recommended it to many people.
David (Canada) on CLZ Books Mobile
Jun 15, 2026
Phenomenal Books Database
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.
#RA2019 (USA) on CLZ Books Mobile
Jun 14, 2026
Book Lover’s Dream
I love how easy it is to keep track of my TBRS.
WorkingMom82 (USA) on CLZ Books Mobile
Jun 8, 2026
A Great Resource
Indispensable to anyone with a large personal library.
LexRex et Magnificat (USA) on CLZ Books Mobile
Jun 7, 2026
Recommend
the scan functionnis excellent.
Go Away on CLZ Books Mobile
Jun 4, 2026
Simple to use this app
Easy to scan very efficient and reliable. The developers did great job and very helpful.
Reshmi Pillay on CLZ Books Mobile
Jun 3, 2026
This is by far the best app for cataloguing books
Easy to use and very user friendly. So many useful fields that can be used to identify your books and keep track of your reading.
Jude Radley on CLZ Books Mobile
May 29, 2026
Great app
I have used this app and desktop version for several years. Occasionally I find a query but the response is always speedy and helpful. I highly recommend all CLZ organiser packages.
53mjr (United Kingdom) on CLZ Books Mobile
May 23, 2026
Great app!
I’ve been using CLZ Books for twenty years, starting back when it was a Windows app and eventually moving to their cloud platform and mobile apps. With more than 2,000 books in my collection, their apps make it easy to keep everything organized across all my devices. I use CLZ to track books I want to buy and read in the future, but also to rediscover books already in my collection that I want to read again. I also share my cloud link with friends so they can browse my collection and find ideas for books they might want to read.
QuantumFlinx (USA) on CLZ Books Mobile
May 23, 2026
Fantastic App!
The best book cataloging app I’ve tried so far. This app is extremely customizable to your needs.
My favorite feature is the shake to pick a random book. My son loves it and I love not having to read the same book night after night after night.
GSit85 (USA) on CLZ Books Mobile
May 23, 2026
Great app
I own both books and movies. This app is very smart in finding the ISBN on a page full of text. For books without an ISBN, there is an add book by title or author. Also has an add manually for those books it can’t find in its catalog although this has only happen twice in the ~500 books I’ve entered. I used the tag option to categorize my books with my own personally created categories and this has worked well so far. It also gives the number of books in each tag. Only took a few hours to enter the number of books I have in so far and I’m not quite done yet. I also like that it gives list price and current value of the book. There is also a link if you want to see if the book is on eBay.
I pretty sure as time goes on I’ll enjoy this as much as the movie app in I have entered my ~2700 DVDs. I would recommend this to anybody with a lot of books who wants to organize their collection. One final note is they have a free backup to the cloud. Enjoy!
Happy book collector (USA) on CLZ Books Mobile
May 22, 2026
Handy app
I have had this app for years now. I like being able to catalogue my books to see what I have. And with over 600 books in my library, it comes in handy!
A Lorette on CLZ Books Mobile
May 17, 2026
CLZ Books is easily the best
I’ve tried several book cataloguing apps and CLZ Books is easily the best. Great value, handles large collections smoothly, and is highly customisable with excellent sorting, filtering and bulk editing.
I especially like being able to separate family members’ collections. ISBN lookup works with typed numbers for older books. Clean, intuitive UI and helpful support.
Lexi Dew (USA) on CLZ Books Mobile
May 15, 2026
Easy to navigate
So easy to use and easy to navigate for a large book library personal.
Nellie Oddy on CLZ Books Mobile
May 9, 2026
Perfect
Best for home family library
rajaland (Italy) on CLZ Books Mobile
May 6, 2026
Ottima app
Velocissima a inserire un libro, con tutte le informazioni connesse, nel catalogo generale. In assoluto la migliore app per quanto concerne la catalogazione dei propri libri.
Carmen Minnuto on CLZ Books Mobile
May 4, 2026
HUGE help in organizing my book collection
Thanks for helping me keep my library organized! I've been a private music teacher for the past 40+ years and over the time accumulated well over a thousand scores and books on voice science, pedagogy, acoustics, physiology, learning, neurology, business etc. Now that I'm retired, that library is being given to other teachers and advanced students or donated to music schools.
I have recommended you and your products to many folks as they have helped me keep track of materials I've loaned out, prevented me from buying duplicates that I don't need and allowed me to keep track of where things were - at the studio, in a filing cabinet or on a bookshelf!
Craig T (Canada) on CLZ Books Web
Apr 20, 2026
What a great app
I’m in my senior years which means 2 things.
1. I have collected a lot of books through the years.
And 2. I’m not as sharp as I used to be.
This app sorted out my library extremely well , efficiently and graphically smart. Love it.
And 3. The folks at CLZ.provided excellent support to sort out my age addled brain, for which I thank them very much. Both product and support are well deserving of my ranking.
Excellent.
Barton (United Kingdom) on CLZ Books Mobile
Apr 19, 2026
Beste Bücher-Datenbank, bester Support - einfach perfekt!
Ich habe die CLZ-Datenbank vor vielen Jahren von meinem Mann geschenkt bekommen, nachdem ich mir ein Buch doppelt gekauft hatte – und war von Anfang an begeistert.
Seitdem organisiere ich wirklich alles darin: Reiseführer, Kochbücher, Hörbücher und sogar Straßenkarten. Besonders toll finde ich die vielen Felder, die sich ganz flexibel an die eigenen Bedürfnisse anpassen lassen.
Auch die Newsletter sind sehr verständlich geschrieben, Neuerungen werden klar erklärt. Man merkt einfach, dass hier viel Herzblut drinsteckt. Und falls doch einmal eine Frage offen bleibt, ist der Support unschlagbar gut.
Ich wüsste ehrlich gesagt nicht mehr, was ich ohne CLZ machen sollte – von mir gäbe es am liebsten 10 Sterne!
chicken_66 (Germany) on CLZ Books Mobile
Apr 18, 2026
Extremely easy to use
So far it has extremely easy to use, despite the majority of my collection needing to be added manually.
BJ Reeve on CLZ Books Mobile
Apr 15, 2026
Perfect for managing my books
It's been perfect for managing my books, the only problem I have is finding the time to scan all of them. I had a weird issue with data being cached, but support were excellent and it's all sorted within about 3 hours.
Andrew Wynn on CLZ Books Mobile
Apr 14, 2026
Truly a life saver
Everything is going great. The ease of use is astonishing! All of my books, so far, have scanned in with no problem. It is truly a life saver for anyone wanting to catalog their book collection.
Chandra on CLZ Books Mobile