Book Organizing Software

Organize your books by ISBN

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.
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

Sep 1, 2025
My book catalog story
I love my CLZ book catalog. I had always wanted to catalog my books and back in the days of card catalogs when I was young, I made an index card file (which I still have). I had far fewer books then. Now I have about 3,000, with book cases in almost every room of our house, and it is hard to keep track of them all in my head. So, one of the practical reasons for having a catalog is to record the location of each book by room and bookcase and in some cases even by shelf. I just have to remember, if I move a book, to change the location in the location field of my catalog. I have been able to locate books with my catalog instead of wasting time searching from room to room.
I have the mobile version as well, for several reasons. Sometimes when I’m in a bookstore, I am not sure whether I already bought a certain book or not; I can tell it is a title I would have liked to own, but I can’t remember if I actually bought it. At least twice I bought a book I already had. Now I can check my mobile catalog. When I finish reading a book, it is quicker to enter that on the “read” field on my phone than to remember to record it next time I am on my catalog on the computer. I can also stand in front of a bookcase with my phone and check whether all the books are cataloged and whether the location is correct.
Beyond practical reasons, I just love having my books organized and cataloged for mental clarity and the pleasure of looking at the titles and covers on the screen. I had once thought of making my own database of my book collection, but it wouldn’t have been nearly as sophisticated as the CLZ one and wouldn’t have included photos of the book covers. Some of my large categories, such as art books, children's books, and Christmas books, have beautiful colorful covers which are a pleasure to look through on the CLZ catalog. I used the genre field to make up my own categories, many of which are not actually genres but the subjects that are important to me. I love that the CLZ software keeps track of the numbers in each category, so for example I know that at the moment I have 184 art and design books, 248 architecture and interiors, 169 autobiography/memoirs, 102 tea books, 213 on England, 206 on New England, 235 children’s books, and 175 Christmas. It’s just interesting to me to know this. It’s a picture of my interests.

So far I have cataloged 2300 of my books. I really enjoy working on the catalog, but it takes time and not all of my books are easily accessible. My method is to scan my new books right away with the app on my phone that CLZ provides, then add them into the collection when I have time to sit at the computer. Then I go to the backlog of older books as I have time and add them in. Some of the oldest ones pre-date the ISBN system and take longer to enter manually. I realize it will take a long time until I am completely caught up, but it’s a goal I’m working towards. I have barely begun to catalog the e-books on my Kindle as that is not as high a priority but will eventually include them as well.
I’ve loved books all my life and also enjoy organizing (probably should have been a librarian), so making a catalog with the CLZ software is a great fit for me.
In the years I’ve been involved with the CLZ catalog, the software has consistently and vastly improved. Many of my books are rather obscure, but more and more of them are recognized in the enormous CLZ database and come in with many of the fields populated and with the cover photo. Previously I had to take my own photos of some of the book covers and upload them, and those photos don’t come out perfectly, but now most of the books come in with the cover when I enter the ISBN or can be found on the “search the internet” feature. More and more information about the books is now included, so that my catalog is an amazing resource.
The CLZ company is extremely responsive when I have contacted them with a question. I don’t know how large or small the company is, but I get a personal response to my emails. I feel confident that they will help me with any catalog questions, and I have a very positive view of the company.

I recommend CLZ Books Web and Mobile to anyone who wants to make a beautiful and useful book catalog. You will be able to sit and scroll through your library and remember books you might not have focused on for some time. You will be able to enjoy looking at the covers of the precious books you have collected and be happy you have them. You will feel organized and be able to locate books in your home. You will have fun with your catalog if you’re anything like me! I even told our local branch librarian about CLZ for his own book collection.
Deborah (USA)

Reviews from customers

Jul 6, 2025
Great App
I have 2000+ books in my home library. This is a great (and actually fun) way to keep them organized and to see if I have a particular book when someone asks or wants to borrow or so I don’t go buying books that I already have!
Also the app has good support if I run into an issue. I appreciated the emailed back and forth to troubleshoot that just this morning helped me through a glitch — when I was trying to use the wrong (HideMy) email address.
JuJeWaAg (USA) on CLZ Books Mobile
Jul 5, 2025
Excellent
A great app to organize your books, especially if you own hundreds of them. The ISBN scan feature works wonderfully and helps to quickly bring in new books. Highly recommended.
Paul Beasley on CLZ Books Mobile
Jun 24, 2025
Great organization
I love this program and have used it for over 10 years. it has kept me from buying books more than once multiple times. Great organization, options, features, and really easy to use.
Stephen Smith on CLZ Books Mobile
May 16, 2025
Easy to use
Great app. I finally have all my books organized! well worth the money. I highly recommend it.
Sande Fitz on CLZ Books Mobile
Mar 12, 2025
Excellent App
What a fantastic app for organising your books, highly recommend.
izi wizi (United Kingdom) on CLZ Books Mobile
Mar 5, 2025
Essential
This is such an essential app for anyone with an extensive library or for those who like to keep their collection organized and accessible. Also a great tool to keep a record of the books you own in the event of a worst case scenario. Easy to use and extensive with a lot of features. Love it!
lord ryno (USA) on CLZ Books Mobile
Mar 1, 2025
Perfect app for my books!
I love the different ways I can organize my books and see the whole collection. I peruse used book stores quite often and this is a useful tool to make sure I don't buy a book I already have. Embarrased to say I have done that a few times...
Lisa Crum on CLZ Books Mobile
Feb 11, 2025
I'm quite impressed with CLZ books
It is well thought out and easy to use. Having entered over a thousand books thus far, the ISBN and author/title searches generally work very well. Data can be simply edited as needed. The ability to search and also add tags to books is very handy. The cloud syncing makes it easy to move between an Android phone and an iPad. I've tried a number of times to organize our books with other S/W, but this is definitely the best I've used.
Terry Herter on CLZ Books Mobile
Nov 28, 2024
Happy with this program
Been very happy with this program. I need to be more conscientious about keeping it up to date but it tracks all my books and gives me ability to search, sort and organize as I need.
William McCourt on CLZ Books Mobile
Nov 27, 2024
Absolutely Love
This app is exactly what I was looking for to catalog my books. I found myself buying duplicates, and decided to go in search of an app that would help me keep track of my books. CLZ Books - library organizer does exactly that and more. I keep books in different rooms in my house, I can note where the books are, mark if I have loaned them out and to who, I can rate them and note when I read them and keep personal notes. It is easy to use, and after initially loading my books, I am able to scan new books easily to add them to the collection. Highly recommend if you have a good amount of books you would like to keep track of.
Booksrox (USA) on CLZ Books Mobile
Nov 23, 2024
Excellent app!
My partner and I have been using CLZ Books to organize our 1,000 plus library since the beginning of November. The upgrade with ISBN character recognition gave us an huge boost just as we were beginning to bog down. The whole app is just wonderfully done. We sent a question to support one evening and had the clear answer the next morning.
Arthur Mislug (USA) on CLZ Books Mobile
Nov 22, 2024
Phenomenal
This app has been phenomenal for me over the last year (& some change)! It was recommended to me by someone who I chatted about books with a lot, after being mentioned in passing as a way she kept her own library (& urge to organize) in check. When I had a big move coming up, I asked her to remind me the details, and if she thought it was worth the subscription costs, and she enthusiastically did so. Despite the recent increase in annual cost, this epic tool has been a life (& wallet) saver!
Adrian Manners on CLZ Books Mobile
Nov 22, 2024
Wonderful app
Easy, wonderful way to organise books, thank you!
Pupsik! (United Kingdom) on CLZ Books Mobile
Nov 17, 2024
Awesome App
I have been using this app now for about 3 years to organize my 100’s of sewing books/magazines and sewing patterns. This app has been a Godsend because now all I have to do is look in my app to see if I already have a pattern or book related to whatever I need or want to sew. No more wasted time searching through boxes or shelves for something I may not even have. I sorted my patterns in boxes that are labeled to match the folder for that group of patterns on my CLZ app. I did the same thing for my books and magazines on bookshelves.
LOVE this app and would not want to do without it.
ArmySgt80 (Canada) on CLZ Books Mobile
Nov 17, 2024
My books organized
Great way to keep all your books updated and organized. every time I go buy new books I scan them in and get them saved!
Brittany Booth on CLZ Books Mobile
Nov 12, 2024
The best organization app for books
This is, by far, the best organization app for my books I've ever used. It pulls resources from every place it's able I've got over 1400 books I've added location labels and sort order. If you're a book lover, the yearly cost is 100% worth it, it's saved me when I had a bookcase collapse!
I've shared this app with family, friends and strangers, I love the online availability, I can create separate lists, sort different ways. I pull up the app while I'm shopping to keep me from buying dups!
Heyhoudini Johnson on CLZ Books Mobile
Nov 2, 2024
Best
I’ve been using this app for the past 5 years to organize digitally my colllection of 2800+ books. I totally recommend it.
10_times_wrong (Romania) on CLZ Books Mobile
Oct 12, 2024
Essential app for the book lover
I have a couple thousand books that I have collected over the years. Some are reading copies and others are first editions. This app makes it easy to add/remove books from your collection and to organize them all.
Highly recommended
paw.books (USA) on CLZ Books Mobile
Sep 27, 2024
Awesome App
I have been using this app now for about 3 years to organize my 100’s of sewing books/magazines and sewing patterns. This app has been a Godsend because now all I have to do is look in my app to see if I already have a pattern or book related to whatever I need or want to sew. No more wasted time searching through boxes or shelves for something I may not even have. I sorted my patterns in boxes that are labeled to match the folder for that group of patterns on my CLZ app. I did the same thing for my books and magazines on bookshelves.
LOVE this app and would not want to do without it.
ArmySgt80 (Canada) on CLZ Books Mobile
Sep 27, 2024
Great App for book lovers
I own a lot of books, and the CLZ app is such a fantastic way to organise my books, know where each book is, view its cover, and avoid duplication. Inputting the books is a cinch too, since most books have barcodes and the app uses the ISIN barcodes to identify the book and ID score to pull out a bunch of information on the book.
Mmmjjj145 (USA) on CLZ Books Mobile
Feb 13, 2024
Great
Great at organizing my books!
Ladena Koch on CLZ Books Mobile
Jan 18, 2024
It's good
Best for what it is. Could use a little more organization/refining for vintage books and different editions of the same book. But I have to update a whole lot less than comparable apps.
Fuz Umthin on CLZ Books Mobile
Dec 17, 2023
10/10 great app
The ability to organise and collate for book lovers and the most organised of people. Quick to set up, easy to add books, and navigate. Random book selection a great addition to make choosing the next read simple if you can’t decide.
Subscription is more than worth the money for a very low £12.99 annually considering the amount of work that must going into the app.
Golfgal1027 (United Kingdom) on CLZ Books Mobile
Oct 2, 2023
You guys have the best program
I wanted to thank all of you for doing such a wonderful job of creating a program that I use for my entire collection of almost 8K books. Every single book I own is in there and I have had multiple sources ask me how I have such an organized collection and I tell them you guys have the best program and incredible customer service. You guys are just a really great company and for someone like me with a disability this helps me organize.
Nelson Fountain (USA) on CLZ Books Web
Sep 23, 2023
I absolutely LOVE this app!
I have been wishing for a tool like this ever since made my first book collection database in Excel 20 years ago, and now I have finally found it! It is beautifully designed, it's very intuitive and simple to use, it is easy and quick to add new books, and it has all the functionality you could wish for. It is also easy to personalize so that you only use the functions that you need, you can sort and organize your collection exactly as you please. And I LOVE that it has all the cover photos instead of just long lists of titles. I strongly recommend CLZ Books to all book lovers out there!
Inger-Anne (Norway) on CLZ Books Mobile
Feb 17, 2023
I have used this app for the past 4 years as I collect manga, light novels, comics, and books. This app has been the best way for me to keep my collection organized and help me keep track of what I own. I especially like that I am able to manually add in any obscure titles that I may find into the database. I would highly recommend this app for anyone wanting to keep track of their book collection.
Brandon Nelson (USA) on CLZ Books Mobile
Aug 11, 2022
I love the program
Actually I am not new to CLZ. Several years ago I had purchased your software for my desktop computer and listed over 700 books I had. I love the program. I since have had several newer computers moved a few times. Donated many books thru the moves and lost my original program on my desktops/laptops.
I was so excited to see you offer an app I can use on my iPhone and reorganize the books I have left which are packed away in boxes currently. So to answer your question I love your app and am excited to get organized once again.
Norma (USA) on CLZ Books Mobile
Jul 14, 2022
Fantastic app!!!
Finally my books are organized.
geoff smith on CLZ Books Mobile
May 23, 2022
Great organizer
Great app. Easy to use. Great organizer for all of your books. Excellent customer service.
Jose Murillo on CLZ Books Mobile
May 22, 2022
Perfect to keep track of everything
Downloaded the trial and started adding books, upgraded to yearly subscription within 1/2 hour! Most of my library is packed away for a bigger house so this app is perfect to keep track of everything I have and don't have as I keep going with my collection. The book Nerd and organiser in me LOVES this app!
Lozzerella (USA) on CLZ Books Mobile