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

Apr 1, 2026
Simply the Best!
This is my third book cataloguing app over the last 20 years, and it is hands down the best. Basically does everything you would want, but most importantly it is actively supported by a clearly dedicated team of developers. My previous apps all eventually withered because the developer(s) lost interest. CLZ seems to be an actively maintained app with frequent updates (the true test).
Highly recommended.
LEK2 (USA) on CLZ Books Mobile

Reviews from customers

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 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
Very nice app
I have been using it for years. With pleasure. This app and desktop application are very well synced.Highly rwcommended.
nepoznata osoba on CLZ Books Mobile
Apr 14, 2026
Library on tap
This app is so easy to use and maintain and provides me with exactly the information, index and library of my books. Great app.
Duke Nukes (United Kingdom) on CLZ Books Mobile
Apr 14, 2026
wouldn't change it ever
been using this for years. can store in cloud in case phone malfunctioning. currently have around 1000 books.
Bob Kelley on CLZ Books Mobile
Apr 14, 2026
Nice app
It's a really nice app, i tried many in the past for catalog my books, i choosed that, I'm happy from many years now.
Nicolas Francfort on CLZ Books Mobile
Apr 14, 2026
Exactly
Awesome app I have scanned all my books and it’s so much easier to see what books I have.
Nana774 (USA) 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
Apr 12, 2026
Easy to use tool
Just such an easy to use tool to make a virtual catalogue of your library.
Nathan Vandenberg on CLZ Books Mobile
Apr 7, 2026
Support Team very efficient
I initially purchased the Book Collectorz desktop software over 12 years ago. Since then my collection has grown to more than 1600 books. With the CLZ Books App I can have this wealth of information with me all the time. I find this App excellent value for the money paid and the Support Team very efficient whenever I had a question.
Gabriele Angst on CLZ Books Mobile
Apr 7, 2026
Very extensive cataloging system
I've used this app for a number of years; it has grown into a very extensive cataloging system, with easily searchable databases. my library includes hardcover, paperback, softcover books along with bound paper groups. I have several major topics- with Alwin's input, I've been able to sort the master list into various topics using "tags". The needed information was in the online manual, but I needed Alwin's help to figure my way thru. very patiently providing online help.
John Brackett on CLZ Books Mobile
Apr 6, 2026
Great app!
Outstanding app. Scans isbn numbers with your camera and finds extremely obscure books!
Kavod222 (Italy) on CLZ Books Mobile
Apr 4, 2026
Top Notch
Bloody marvellous, well done sirs.
BlackDog123 (United Kingdom) on CLZ Books Mobile
Apr 2, 2026
Terrific!
Now up to 2800 books and counting - a great bit of software backed up by readily accessible support. Congratulations.
Rudall Carte (United Kingdom) on CLZ Books Mobile
Apr 1, 2026
Book Library
Makes keeping track of all reading so easy.
Celest Rattliffe (USA) on CLZ Books Mobile
Apr 1, 2026
Simply the Best!
This is my third book cataloguing app over the last 20 years, and it is hands down the best. Basically does everything you would want, but most importantly it is actively supported by a clearly dedicated team of developers. My previous apps all eventually withered because the developer(s) lost interest. CLZ seems to be an actively maintained app with frequent updates (the true test).
Highly recommended.
LEK2 (USA) on CLZ Books Mobile
Mar 29, 2026
Best user friendly database for books
I have been using this app for many years and have not been disappointed. This app is constantly upgrading to make it easier to use with less work on my part and It is reasonably priced. I highly recommend this app.
maine fanclub (USA) on CLZ Books Mobile
Mar 26, 2026
The Library Organizer
I’ve been using this handy app for many years to keep track of my books that I’ve read and want to read. It has prevented me from buying a book that I’ve already read or have on my bookshelf (either a physical book or on my Kindle).
The developers are responsive to problems and suggestions for improvement. Bottom line: an invaluable resource for library management.
Daniel always Reading (USA)
Mar 25, 2026
Excellent app has made cataloguing a 2500 book library a breeze.
on CLZ Books Mobile
Mar 24, 2026
Keep track of all your books
I love this app. I use the comic collecting version as well. It keeps all your books in one place and is highly customisable. For instance I have a custom field which helps me keep track of what I’ve read, notes for what I thought about it and it just works flawlessly.
A great app for any bookworms out there!
AndyY1508 (United Kingdom) on CLZ Books Mobile
Mar 24, 2026
App very helpful when buying books
This app has saved a fortune by allowing me to check whether I have already bought it already.
Bracknell (United Kingdom) on CLZ Books Mobile
Mar 24, 2026
A Library’s best friend
I’ve been using CLZ for a while now and am slowly organizing my library with it’s help. Easy to use and allows me to put all the information from my library, both physical and digital into one place. Highly recommend.
Well planned app (USA) on CLZ Books Mobile
Mar 24, 2026
This app is very easy to use. Love it!
I use mainly to record titles I have read and those I wish to read or avoid. it includes basic bibliographical information as well as the option to add extras and notes. I wouldn't be without it.
Mary Ross on CLZ Books Mobile