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Keep track of your book collection - just scan ISBN barcodes

Automatically download book details by ISBNLike author, title, publisher, genres, subjects & cover art.
Just search our huge online book database ... ... by ISBN or by author & title.

For phones/tablets

Mobile app for iOS & Android

  • Fast and slick mobile app
  • Install on multiple phones/tablets
  • All data stored on your device
  • Sync data to CLZ Cloud (optional)
  • Built-in camera barcode scanner

For computers

Web-app for Windows and macOS

  • Easy to use online software
  • Login and use from any computer
  • All data stored in the CLZ Cloud
  • Automatic updates & backups
  • Free CLZ Barry barcode scanner app

For Windows only

Download for Windows

  • For advanced Windows users only!
  • Install on one Windows PC
  • Manage your own data & image files
  • Sync data to CLZ Cloud (optional)
  • Free CLZ Barry barcode scanner app

Buy them together and get a discount

CLZ Books
1 year
Book Collector
1 year
Book Connect
1 year
USD $0.00
USD $0.00
save USD $0.00

Use the free CLZ Cloud service to:

  • Synchronize your book database between the desktop software, mobile apps and the Connect web-app.
  • View your list online and share it with friends and family.
  • Always have an online backup of your book database.

Latest software updates

Reviews from customers

July 13, 2021
Perfect app, makes things so much easier!
As someone who is always buying books, and couldn't keep track of what I had, this was a must have for me! You can mark them as part of a series, and what order they go in, you also can edit any field to what ever you want if you want a different way. Now I always know what books I have in a series and never bought a double again! I've enjoyed it so much I use their Movie app too, and subscribe to the online service for a version of both on my laptop! — Rob Conley on CLZ Books
June 22, 2021
Perfect for our Clubhouse library
Love this app. It works perfectly for our community library of more than 5,300 books. Our card catalog used to be 3x5 index cards that were never updated regularly, so CLZ Books really helps to keep track of what we have. — V. Stephens on CLZ Books
June 14, 2021
Best book database I’ve found!!
UPDATE: once again, Alwin and his team provide the best customer service available! I noted an issue and received an immediate (less than 2 minutes!) response. Naturally, he was right and I was wrong, oops. Keep your book collection neat and tidy everywhere you go.
CLZ Books has to be the best app available! The developers spend countless hours upgrading, improving and revising so that the end user experience is fantastic! I can think of no other app that I recommend so vigorously. Been using CLZ Books for two years now and have been pleasantly surprised. Top quality customer service. (This alone grants the developers 5 Stars) Inexpensive compared to other apps. They are continually interested in updating and improving this app for everyone. Easy to use and enter new books. There’s a space for almost everything and the final result will help you keep track of all your times. Many thanks. — Consumerpaul on CLZ Books
June 14, 2021
School library
Great app to keep track of our book collection. — Th0Gr0 on CLZ Books
June 05, 2021
Long time user
I have been collecting books for what feels like forever. I started using Collectorz book collector back in 2000 on a Compaq iPaq to keep track of my books, after buying too many duplicate copies of boo I already owned. Since then I have changed platforms over the years - Windows and Mac for desktop, Android and now CLZ Books for iOS.
I have upgraded for each new release because of how happy I have been with the app. It allows me to instantly verify if I already have a book in my library when I am out shopping. It also helps me when I try to locate a particular book in my library by filling in the location with information on which room/bookshelf it’s located in.
I’ve been telling all my book collecting friends about it and convinced a few to give it a try.
My advice: try it, you’ll like it. — bfine78 on CLZ Books
June 01, 2021
The best
Best way to keep books and keep track of when read. — Steven B on CLZ Books
June 01, 2021
Very Handy!
If you are a book collector (a bibliophile!) then at a certain point you can’t keep an accurate track of your collection in your head. This becomes a problem when you are in a book store, you see something interesting and you really should know if you already have that book, or that particular edition or if the asking price is a bargain or too high. CLZ Books on the iPhone is a perfect way to keep track of not only what you have in your collection but also what is on your “want list” with lots of details. Using a book’s ISBN code, CLZ Books will fill in most of the critical data, including an image of the cover, and it is quite easy to add the missing pieces that are important to you (date of purchase, which bookstore, etc.). All this information sitting there sitting in your phone ready to be tapped into on a moment’s notice. I’ve been a CLZ customer for many years, starting when only a PC version was available. I didn’t choose their program lightly. It was just the best one available at the time. Their constant improvements and their expansion into the Mac world and then onto the iPhone has confirmed that my early adoption was valid and I still am a total fan of their app and believe that the price is a bargain for the product and the service. — jfair3 on CLZ Books
May 30, 2021
Great app and great team
I have been using the desktop Book Collector for many years to keep track of the books I own, the books I’ve read, and the books I want to read. The support (mostly for help moving to new computers over the years) has been prompt and kind. I love the CLZ mobile app because I can sync with the desktop version and check my collection while on the go. I’ve never needed support with the app but know that the team would respond promptly if necessary. All around good people with great products. — Orgmom on CLZ Books
May 29, 2021
A super app for book collectors
The CLZ book program works beautifully. I have over 6300 books and have used this program for several years. I wanted a program that would be easy to use and accurate. I was often buying duplicate books because I could not determine if I already had a certain book. Using this program eliminated this problem. This has to be the BEST program on the market for tracking books and providing the records for insurance in case of fire or theft. I highly recommend this program for anyone trying to keep track of their books. — Lexkyusa on CLZ Books
May 29, 2021
Does it all. Cover to Cover
I had tried a few catalogue apps for my book collection. Most were okay, but they didn’t do everything I wanted, or they were too difficult to manoeuvre through, or just too expensive. Then one day, about 7 or 8 years ago, the one I was using just quit working. I couldn’t even get into it to export what I had already entered in. I went online and found out that it was done, no longer supported, and no questions would be answered. So I went online and started looking. It didn’t take long. I found a reference to Book Collector. This was an app that I could download and it looked like it would everything that I wanted. It was a reasonable price, and so I decided to give it a try.
FABULOUS ! FABULOUS ! FABULOUS !
It does everything I need, and does it well, and smoothly, and with over 3500 books on my shelves, that’s important.
Since then I have switched to their cloud service, CLZ Books. I no longer have to use my memory space. I just log in, make entries, deletions or changes and it’s done. The price is still very reasonable. This is the best book cataloguing service of any I have ever used. They also offer apps or cloud service for collectors of Movies, Music, Comics and Games. This team of developers has done and continues to an outstanding job. I would 100% recommend this to anyone who has a library to keep track of. — Ti-Cat Matt on CLZ Books
May 27, 2021
A must for prolific readers
Having an awful lot of time for reading over the past year or so, this app helps me to keep track of what I’ve read-especially useful if you’re a kindle reader where you lose track of what you’ve read without a physical cover to refer to! The app works well and so far I have never lost all my data so it must be fairly idiot proof! — Emmabookworm on CLZ Books
May 25, 2021
Easy to use, great support
I looked at many other programs and found the book app superior to all the rest. It's four years later and I thought I would update what I thought about this app. I love the ability to scan your smartphone and have a transmitted to your desktop automatically. It's easy to use, keep track of your books in different forms and you can change the looks and the settings of how they are displayed. It's a great little app, easy to use with great support. Rates five — Wayne Dyche on CLZ Books
May 23, 2021
Great app to track my books
This is a great app for keeping track of your book collection, whatever you have. I have hundreds of books, paperback, hardcover, trade paperback, and hundreds of kindle books. The app is so customizable, and you can search your database in so many ways. By author, genre, publisher, type of book, read or unread. Customer service is great as well. These people really seem to care about you, and help to resolve any problems you may have. And you can keep your collection synced between your iPhone, and iPads. Works great, and it’s well worth the $15 a year they charge. — Thedeebert60 on CLZ Books
March 31, 2021
Best book database I’ve found
Been using CLZ Books for two years now and have been pleasantly surprised. Top quality customer service. (This alone grants the developers 5 Stars) Inexpensive compared to other apps. They are continually interested in updating and improving this app for everyone. Easy to use and enter new books. There’s a space for almost everything and the final result will help you keep track of all your times. Many thanks. — Consumerpaul on CLZ Books
January 13, 2021
Great program
Great program to keep track of all my books and great customer service get back to u same day. — B Kelley on CLZ Books
November 05, 2020
Keeps getting better
Great app for keeping track of books including ebooks., easy to use and keep track across all devices. This app keeps getting better, regular updates and improvments. — Richard Davies on CLZ Books
September 28, 2020
I love it
I am a book nerd and it is great to keep track of what I own when i am in a used book store. Also nice for recommendations. I love it. — Jgeis1701 on CLZ Books
September 27, 2020
Book Database
Great database for keeping track of books read, making notes of the storylines - easy to use and syncs between IPad and IPhone. — Yvonne1234567890 on CLZ Books
August 26, 2020
Perfect app
Perfect way to keep track of my 8000+ books. — Mathilda Bach-Frommer on CLZ Books
May 30, 2020
Great tracker
Great for keeping track of the books I can't stop buying. — Andy Woodward on CLZ Books
May 02, 2020
No more duplicates
Finally have a way to keep track of all my books and no more duplicate buying when out shopping! — Candace Buyuklu on CLZ Books
February 29, 2020
User since 2014
I’ve been collecting books my entire life and always wanted a library database like my local library. However, despite my best efforts, cataloging everything in excel and FileMaker Pro took forever and lacked the functionality I craved. I joined the Navy, and while I was in boot camp, my house burned down. My books were in the basement, and were destroyed by the water used to put out the fire. My family looked for a way to easily track my books for insurance purposes, and they found this app. This app answered both their needs and my needs. As I worked to rebuild my library, I kept buying duplicate books since I had a hard time differentiating the books I had lost from the books I had repurchased in my mind. I am now back over 6000 books and counting and I rely heavily on this app as well as the desktop version to keep track of my library. Sure, the core doesn’t have the most accurate or cleaned up data available and many plots are missing, but that allows us the take the data provided and make it our own. It’s a pity they had to change to a subscription service, because whenever I go to book stores or sales, I’m always suggesting CLZ products to my fellow patrons.
The barcode scanner saves me tons of time. — Hale.Yeah on CLZ Books
February 13, 2020
Love the app
I use it to keep track of the books i have read, so i know what to read next. — candy dugdale on CLZ Books
January 31, 2020
Great help
A great help in keeping track of all my books. — Elizabeth Gingerich on CLZ Books
January 03, 2020
Love this app
Excellent way to keep track of the books I’ve read. Easy to add books to the collection, very few I’ve had to add manually so far. And I’ve read some oddball stuff. I had a small problem when I moved from a monthly to yearly plan and support was very responsive; led me through the fix and got me going quickly. I’ve tried others, free and not, and this app is well worth the price. — Miss Eddyp on CLZ Books
December 16, 2019
Excellent interface
Great layout to keep track of books, movies, music, and more. Never buy any duplicates again! Carry a handy record of everything you own; highly recommended! — Franklin Reed on CLZ Books
December 09, 2019
Awesome app and support
I downloaded this app after trying many book tracking apps. I found this to be the best interface to help get my son interested in reading. The cover flow is a great way for my son to see what he has read and help him to keep track of his favorite books. I love this app and company. — jwiens35 on CLZ Books
December 05, 2019
Best I've found
I have used several apps to keep track of my library over the years, and this has been the best that I have tried. They keep adding features to make it better. — Kent231 on CLZ Books
November 16, 2019
Keeping track of your books made easy
Great app to keep track of your own books and the ones from friends or Library you’ve read. CLZ Support team actually listens and responds to individual clients as needed. The app continuously improves from one version to the next, based on their expertise and the feedback they get. Worth the investment! — mikki200382 on CLZ Books
November 05, 2019
Great tool for the book lover!
Great way to keep track of your books. It keeps me from buying any twice. — Cindy Frederick on CLZ Books

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