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Library Software - catalog your book library

Automatically download book details and imagesLike 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

I am trying to catalog my husband’s library of about 2500 textbooks in different languages. I searched all over the web and finally came upon CLZ. This sounded just like what I needed. I emailed them to inquire about this and got a positive answer in less than 24 hours. We bought the app and I started to catalog all the books. By now I have entered about 1150 and moved to the cloud. Every time I had a question I got an answer in less than 24 hours. Their support staff is excellent. This is really a great app and I couldn’t be happier with it. I highly recommend it to anyone who tries to catalog their libraries. — ollldie on August 30, 2021

Reviews from customers

August 09, 2021
Highly recommended
Easy to use, extremely detailed app that allows me to keep my library nice and organized... not to mention, keeping me from buying the same book more than once. Highly recommended. A++ — Rodrigo Mendonça on CLZ Books
July 26, 2021
I love this app
It helps me to keep my library in order and keeps me from buying the same book twice. I want to give a special shout out to Alwin in support for working with me to fix some issues that I had. Great support and great app!! — Morgan Holmes on CLZ Books
July 22, 2021
Absolutely superb
I am a professional library worker and this app holds its own against our system. Love the way you can adapt it to your own individual needs. — A Google user on CLZ Books
July 01, 2021
Love this app!
I use CLZ books to manage my quilt books library. It helps me avoid buying duplicates which is good for my wallet. It’s also easy to add new purchases to the collection. Thank you, CLZ, for keeping me organized!! — JCquilter on CLZ Books
June 24, 2021
Best App and Customer Service App Ever!!!!
I am most pleased to post a review for the CLZ Book App. I truly love this app. I searched for a cataloguing library app for years to catalog my book library. For years, I kept a paper copy of my books, but found this to be ineffective due to the fact that my collection over the past twenty-five years had grown by the thousands. But luckily, I kept searching and found the CLZ Book App. A couple of years ago, I read all of the reviews and convinced myself to purchase the app. Over the past couple of years, I have spent so much money on apps that promise, but do not deliver. But after purchasing this app, I can honestly say that my faith was restored. This is the BEST app for developing and maintaining a library.
It’s easy to input the information about books and the developers are constantly making changes to make this the best book cataloguing app ever. In the couple of years that I have used this app, I have found the developers are very responsive and responded quickly whenever I had an issue.
If you are looking for an app to develop your library, the CLZ Book App is the answer. I highly recommend this app and give it a 5. If I could, I would give it a 5+++++. — miss BCAEA 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 20, 2021
A spectacular piece of software
A spectacular piece of software that's updated regularly and with great awareness of user needs. Constantly improving on an already best-in-category app. Easily the one piece of mobile library software worth the cost...Amazing developer, superb app! — Shawn Nacol on CLZ Books
June 07, 2021
The best app on my phone
This is maybe the best app on my phone. I used to have a real problem with accidentally buying books I already owned, but now all I need to do when I'm out book shopping is just check my catalog in the app if I'm ever unsure. Naturally you get the most out of its features when it's linked to the CLZ programme on your computer, but I'm sure it would work perfectly for someone just using the app. I'm a library professional, and I feel like CLZ perfectly blends easy use and robust features. — V33 A99 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 04, 2021
Excellent program
I love this app. Great way to keep up with my library. I use it while book shopping so that I don't purchase something that is currently in my library. — Erin Rhoden on CLZ Books
May 30, 2021
Fantastic software for bookaholics - and clubs
I have used the book cataloging software for many years to catalogue the many (many) books we have stored in numbered boxes and bags in our loft. I had also catalogued the books belonging to our local Embroidery group. We wanted to make full use of the group’s books during lockdown and with the superb help of the Collectorz support team, we set up a separate Library and included, on separate sheets, books belonging to members who were willing to loan them out. Until face-to-face meetings resume, we have an ad hoc doorstep delivery system in place, supported by the Loan facility within the software.
The CLZ Barry scanner enables members to scan the barcodes of books they are willing to loan and email the ISBN numbers directly from the App to our Librarian for logging. Subject to Covid restrictions, we can work directly with any member who has as many books as me, to load the books directly. It is particularly helpful to be able to sort on technique, subject etc as well as author and title.
The software works and the support team are easy to contact and really helpful. Highly recommended! — Teresa the embroiderer 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 21, 2021
Best book catalogging tool
Love this app for keeping my library of books on record and well organized. No more duplicates which can be frustrating as well as expensive. I appreciate knowing my database is available to me on my PC and cell phone via the cloud, with no worries about maximum size. I’ve had this software for years and have enjoyed watching the developers continue to expand and improve its capabilities and design for ease of use. They’re always available and very prompt with functional as well as technical issues. I look forward to the future knowing we can rely on their growth and continuance. — halftracker on CLZ Books
April 07, 2021
Boyfriend’s Library
I have been hand cataloging and boxing up my boyfriend’s library for weeks now. There has to be at least a thousand books, bookshelves in every room. I have found many duplicates because he doesn’t recall which ones he has already bought. Now that I have the CLZ app I am saving so much time and he’ll never buy another duplicate! Loving it! — GourdsbyCarole on CLZ Books
March 24, 2021
No more duplicates
Love, love the ability to view what books we have in our library. Rarely do we duplicate. — Victoria Trujillo on CLZ Books
March 09, 2021
Long time user
I started using book collectorz years ago, probably 10 at least maybe more. I was using the PC desktop version until last year when my computer had a major meltdown. It took me a while but I decided to get an iPad and finally downloaded the mobile version of book collectorz. I figured I would have to redo my entire catalog all over again and I had tons of information. This was the best program I had found, hands down, and I loved updating my catalog.
To my surprise, I found my catalog in CLZ. I don’t have to redo every single book, yay! At the time my library was 6771 books. It was a daunting task to think of having to redo it. I’m thrilled I don’t and only have to add the new books. I love this program. It’s got so much functionality, easy to use, and looks good while doing it!
I recommend this program over anything else you could ever find. — books of kel on CLZ Books
February 28, 2021
Very Powerful App
We are using this app to catalog our church library. I tried several apps and this is, by far, the most powerful. I’ve been using it for a week and have already cataloged over 1,500 books. In a week they have already had a few updates, just adding little helpful touches. I love that I will be able to post a link to the books in the cloud so people can see what books are available. They can sort and search without actually changing the database. I can even download a .csv file to print labels for all the books. Very responsive customer service! Thanks! — CNK14 on CLZ Books
February 02, 2021
Fun experience
I had this fun experience of attending a used book sale today where every book was 50 cents. I got my pile together, went off in a corner and entered them all into CLZ. In one batch I could add the specifics of the 50 cent price, the library sale I bought them at and the date. — Maria Stahl (USA) on CLZ Books
October 03, 2020
Excellent
Excellent tool for organizing a library of any size. — David Gronseth on CLZ Books
July 05, 2020
Superb!
So far I'm able to scan my books and list them. This app is what I need. Extensive library! I'm just getting started. — A Google user on CLZ Books
June 19, 2020
Great library experience
More than 15 people who are on our Library Committee and staff have looked at our 1500 book catalog in CLZ Cloud and are very pleased with it. To a person, they have said how user friendly they think it is. I am delighted since there were several people who questioned why we needed a catalog. You know how some older people are about change! I am an older person too but I am thrilled to offer your product as a great improvement to our library experience. Just think, we can check for books in our retirement community's library from the comfort of our own apartments and cottages! — Betty Iwan (USA) on Book Collector
June 06, 2020
Amazing app
I am using this app to help me organize my sheet music library. It is amazing. I wish I would have started this sooner. — Brett Merberger on CLZ Books
April 30, 2020
Invaluable app
Would not be without it. Invaluable when choosing books in library. — Stuart Ogg on CLZ Books
April 23, 2020
The BEST book cataloging software
I have used many book cataloging softwares ( including Library Thing). Book Collectorz is the best because:
1. It never, ever, ever, ever hangs
2. Customer support is top class
3. Deeply customisable
4. Available and syncs across all platforms
5. Very fast
6. Includes the 'Book Lending' feature
7. Very low cost for such a feature rich and solid software. — Param96 on CLZ Books
April 13, 2020
Library of about 5,000 books
I have a library of about 5,000 books. Book Collectorz is fast, reliable, flexible, and well-supported (including regular updates). I have used it for 10+ years. Five Bright, Shining Stars. — Sterling Sunley 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 18, 2020
Greatest software for book lovers
Began with CLZ over 4 years ago. Took time to load in my library, but since then adding new books has been very simple. Updates are frequent and each one has been useful. I love keeping my book lists up to date and especially appreciate not buying duplicates anymore! — halftracker on CLZ Books
February 14, 2020
Great product!
I have about 3500 books and cannot remember where they all are. After searching extensively for a REASONABLY PRICED product to use to catalogue my library, a friend who is a librarian told me about CLZ. Wonderful! Don’t use it every day, but it is invaluable when I do. — Preachean on CLZ Books
December 28, 2019
My library
I have been using this app for several years. It is continually improving, and provides for a very comprehensive database of my large number of books. Easy to use, add books, and access details of my library. — Steve Harper on CLZ Books
December 19, 2019
Excellent way to organize your books
With this app, you will always have the titles of the books you have read or want to read in a very organized and easy to use format. No more going to the library or book store and not remembering if you already read a particular book. — Richard from Nevada on CLZ Books

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