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
Mobile
Mobile app for your phone or tablet
iOS & Android
iOS & Android
USD $19.95
per year
More about the mobile app
CLZ Books
Web
Web-based software for your computer
Windows & macOS
Windows & macOS
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
v10.6: Track your Reading History, plus other new data fields
Feb 24, 2026
Create your own Custom Fields!
Feb 23, 2026
New setting to disable book values
Jan 09, 2026
v10.5 iOS: Disable book values / Search by ISBN10
Jan 07, 2026
v10.5 Android: Smoother navigation / Disable book values / Search by ISBN10
Jan 06, 2026
Mar 9, 2026
A Wonder Worker
Before coming across CLZ Books, my collection was kind of ‘By guess and by golly.’ I am now able to locate any book in my collection and have it in hand within a minute. It allows me to build and work with collections (topic, author, copyright dates, etc.) The price is not excessive and the control it gives one are well worth it.
For someone who is more ‘techy’ than I am, it offers even more opportunities. It has an app for connecting with other users, and they have regular updates by email for a variety of uses.
For someone who is more ‘techy’ than I am, it offers even more opportunities. It has an app for connecting with other users, and they have regular updates by email for a variety of uses.
Reviews from customers
Mar 10, 2026
Superb app
Very easy to use and stylishly presented. Update - I've now been using the app for over a year and can absolutely recommend it. If you're looking for a library catalogue app this is the one to go for. As a plus your catalogue is also accessible though the CLZ Cloud.
Mar 9, 2026
A Wonder Worker
Before coming across CLZ Books, my collection was kind of ‘By guess and by golly.’ I am now able to locate any book in my collection and have it in hand within a minute. It allows me to build and work with collections (topic, author, copyright dates, etc.) The price is not excessive and the control it gives one are well worth it.
For someone who is more ‘techy’ than I am, it offers even more opportunities. It has an app for connecting with other users, and they have regular updates by email for a variety of uses.
For someone who is more ‘techy’ than I am, it offers even more opportunities. It has an app for connecting with other users, and they have regular updates by email for a variety of uses.
Mar 9, 2026
Muy buena y con mejoras continuas
Una aplicación muy completa, funciona sin problemas, se actualiza constantemente y a buen precio.
Mar 9, 2026
Just What I Needed!
I had considered many ways to catalog my large library of history books. I had, for example, thought about creating an Excel worksheet. That was too cumbersome and too probe to error. Then, I stumbled upon this marvelous app and my problems were solved. Thanks so much for your creativity and ingenuity.
Mar 8, 2026
Top App
Smooth, easy app. Gives me quick access to my 9000 book collection. This app continues to deliver great database mgmt. and new features. The top app in the field of collections.
Mar 8, 2026
Excellent App
I have been using it for many years and have been totally satisfied. The developers frequently update it and add new features.
Mar 6, 2026
Love this app!
keeps my books organized and cataloged.
Mar 6, 2026
No more duplicate books
I have been using CLZ Books since the early CollectorZ days when Books was the only desktop version. My experience with all versions if CLZ Books over the years has been truly satisfying. Now I synch my desktop with my mobile with my cloud effortlessly. I no longer worry about purchasing duplicates of books that I already have but don't remember.
Thanks CLZ for your accuracy and consistency over the years.
Thanks CLZ for your accuracy and consistency over the years.
Mar 5, 2026
This app was perfect for me
My TBR list is so long and I often forgot which books I've already purchased. This app was so easy to use and now I have access to my library wherever I go. No more buying duplicates.
Mar 1, 2026
Keep track of books
Efficient & safe way to keep track of books while shopping for new ones.
Feb 24, 2026
Great book organizer!
This app is very well done. It is super simple to input books and all the details about the books. The look is very appealing to the eye and can be easily modified to your preference. Plus it is very affordable!
Feb 22, 2026
Great App
I really love this app to keep track of all my books. You can have different collections and I am also able to keep track of my son’s books also, while they are still separate from my collection. I’ve had this app for a year and ran into an issue where somehow I had 2 accounts. I reached out to support and they were so helpful and merged my accounts for me with no problem.
Feb 21, 2026
No more duplicates
There are a bunch of ways to sort and filter. I love the sound the scanner makes, it's very satisfying. It's great to have this since I like buying both online and in stores, I don't have to worry about ending up with duplicates.
Feb 17, 2026
The Best
This is the best app I’ve encountered for managing a home library. It does everything I need and more. Even better, the developer and team constantly add new functionality that makes the app even better.
Feb 17, 2026
Uitgebreid maar overzichtelijk
Ik ben al vanaf het begin een gebruiker van CLZ Books. Alle gegevens, die ik over een boek wil opslaan, kunnen erin. Het fijne is dat ik zo een totaaloverzicht heb op zowel de telefoon, de Ipad als op de Windows-PC. Met bijna 2000 boeken raak ik toch nooit het overzicht kwijt. Voor mij is ook handig dat ik in mijn boekenbestand specifieke dingen kan zoeken en apart uitdraaien, bijvoorbeeld voor een literatuuroverzicht. Invoeren van de gegevens is supergemakkelijk met ISBN of barcode. Happy user!
Feb 13, 2026
Just What I Needed
Easily catalogue your book collection with a large number of categories to record all relevant information. Makes for easy referencing when your book hunting to not only know if you already have a book but also whether your copy has all the same features.
Feb 13, 2026
Easy to use for all your cataloging and sales needs
I have been using CLZ Books for nearly twenty years and have never felt the need to look for an alternative database. Easy to use, with many useful features for the bibliophile and avid reader alike. Also useful if selling books is your side hustle, tracking previous and current values, stock numbers and whether a book has been in your inventory before. I recommend Collectorz Books highly.
Feb 10, 2026
Highly recommended !
This app organizes your books, very well done easy to use, set up no problems! Makes your library even more enjoyable.
Feb 10, 2026
CLZ Books - Great
Ik gebruik CLZ Movies en CLZ Books al jarenlang met heel veel genoegen. Movies vanaf 2011 en Books vanaf 2016. De gebruikersvriendelijkheid en ondersteuning is in al die jaren op een zeer hoog peil gebleven. Alwin en zijn medewerkers reageren altijd heel erg snel. Wat erg te waarderen is dat er binnen CLZ altijd goed geluisterd wordt naar de gebruikers. Dat betekent dat er zinvolle updates en modificaties worden verwerkt. Steeds met dat luisterend oor naar de gebruikers.
Feb 7, 2026
Excellent
I am using this to catalogue my late father’s library. Its database of books and its ability to search against ISBN are vital tools. I would be lost without it. The support staff are very responsive and the one time I needed them quickly resolved the issue.
Feb 7, 2026
Just excellent!
I’ve been using CLZ Books for years across iOS, macOS and the web, and it remains the best book cataloguing app available. It’s regularly updated, well-supported, and continues to improve with every release. Absolutely top-notch—highly recommended!
Feb 7, 2026
12 years later I am still happy!
The mobile app accesory to Collectorz excellent book organizing database system. Tracks your Ebooks, too. Collectorz offers a complete suite of custom databases to help you organize your life. They are constantly improving their product and offer customer service and support that many other companies can only dream of. You may be able to find cheaper or even free aps that claim to do much of what Collectorz offers, but you won't find better value anywhere.
Feb 1, 2026
Great App
I’ve used this app for years! Very easy to add books and customize entries. On the rare occasion that I have had to reach out to Support the response has been prompt and very helpful. Love this app!
Feb 1, 2026
Great app
I have been using CLZ Music for some years and have found it very useful. Now CLZ books seems just as good. I have several hundred (maybe a thousand?) books. Scanning bar codes or entering ISBN numbers makes entries easy. For some old books you need to enter the details manually and can photograph the cover to complete the entry. Details about the book and your opinion or whether it is in your ‘waiting to read queue’ can also be entered. Great app!
Jan 29, 2026
Two decades of excellence
I’ve been using versions of this software for twenty years and it has just kept getting better. The developers never rest on their laurels but keep finding ways to tweak and add to the software in genuinely helpful ways. I have more than 6000 books in my collection and the software is quick and efficient both for sorting and for locating specific books.
Jan 29, 2026
Best book organizing app!
I’ve been looking for a really good way to organize my library. I am a collector with literally hundreds of books. This is the way! Even my old books, with no ISBN numbers, are easy to add, and it’s great to be able to be organized at last. Customer service is exemplary and I’m so happy a friend recommended this.
Jan 29, 2026
Maravillosa aplicación
Maravillosa aplicación para mantener una biblioteca personal. Impresionantes sus capacidades gráficas y de clasificación de los contenidos. Su interactividad es otro elemento a destacar.
Jan 29, 2026
Easy to use
I use this for my books, easy to use, easy to look up what you need.
Jan 29, 2026
Sehr zu empfehlen
Funktioniert einwandfrei und bietet eine einfache Möglichkeit, einen Überblick über den Bücherbestand zu behalten. Besonders lobenswert ist außerdem, daß die App ständig weiterentwickelt wird, und man auf Fragen auch zeitnah Rückmeldung von den Entwicklern bekommt.
Jan 27, 2026
Love the app!
I have my 1200 treasured books. I love the values given!