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!
Mobile
Mobile app for your phone or tablet
iOS & Android
iOS & Android

USD $19.95
per year
More about the mobile app
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
Aug 18, 2025
Terrific
Now up to 2500 books and counting - a great bit of software backed up by readily accessible support. Congratulations
Reviews from customers
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.
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.
Aug 29, 2025
Meget bra app
De har også en meget god kundeservice hvis du kontakter dem og spør om noe. Kan anbefale denne spp.
Aug 26, 2025
Joy to use
Enjoy it alot. Reasonably priced.
Aug 21, 2025
Categorizing my books
It's my first time truly categorizing my books, and I'm loving the app. It's very easy to use, especially the subject matter categories, and the added feature of being able to add books to be bought or ordered is a great touch.
Aug 18, 2025
Terrific
Now up to 2500 books and counting - a great bit of software backed up by readily accessible support. Congratulations
Aug 17, 2025
Great database
Great way to keep track of my books!
Aug 16, 2025
VERY capable app
This app is so feature filled it is just amazing. My husband has a library of 5,000 books we thought we would never catalog and now I have got have of them in my CLZ database already. I have a few minor issues and suggestions which I am going to send to the developer separately, but in general, I love this app.
Aug 12, 2025
Love the app
Love the app and the customer service team is amazing! I had an issue with the app crashing repeatedly and they were able to quickly fix the issue.
Aug 12, 2025
Great help
Excellent tool, of a great help, since i have 300+ Star Wars books plus some comics, plus as many fantasy books.
Aug 11, 2025
A bibliophile's joy
CLZ is absolutely essential-to-my-needs-couldn't-survive-without-it app.
Had this app for 9 years, I use it constantly. It's how I avoid buying duplicates at book sales, find books on my wish list and know to buy better editions when I come across them for sale. Love it, love it! I also have CLZ Movies, which is also fabulous and now it's time to add CLZ Music
Alwin, the developer, replies to emails personally, and CLZ are always looking to add more and more functionality. My favourite app(s) hands-down, in daily use to enjoy my libraries and having them catalogued and sorted in a myriad of ways.
Go on, spoil yourself - very reasonably priced and worth every cent. CLZ has it all.
Had this app for 9 years, I use it constantly. It's how I avoid buying duplicates at book sales, find books on my wish list and know to buy better editions when I come across them for sale. Love it, love it! I also have CLZ Movies, which is also fabulous and now it's time to add CLZ Music
Alwin, the developer, replies to emails personally, and CLZ are always looking to add more and more functionality. My favourite app(s) hands-down, in daily use to enjoy my libraries and having them catalogued and sorted in a myriad of ways.
Go on, spoil yourself - very reasonably priced and worth every cent. CLZ has it all.
Jul 28, 2025
Keep track of all my books
I have used the CLZ comics and movies app and needed the book app to, to keep track of all my books. I have had no issues with any of the apps. They run smoothly and keep inventory of everything!
Jul 27, 2025
Pratique
Pratique, simple, rapide, efficace.
Jul 27, 2025
Excellent Book Collection Software
Used with the synced phone app and cloud storage, I can always see not only the titles of what I have, but the table of contents that I add. I can access the links to added online reviews, to added notes in my document files, and to online information about the authors.
As an academic, this software has been a game-changer. I love it and use it daily.
As an academic, this software has been a game-changer. I love it and use it daily.
Jul 27, 2025
Home Library
I have been thinking about cataloguing my books for years but the daunting task always stopped me from doing so. I then came across CLZ and thought I would give it a try. I was very impressed at the ease at which I could enter books and the speed using ISBN bar code. I also found the App flexible to be able to add obscure books and very old books.
Very pleased and I even enjoyed the experience of adding books. It suited my requirements and much more.
Very pleased and I even enjoyed the experience of adding books. It suited my requirements and much more.
Jul 26, 2025
Wonderful tool
Just a note to say thanks very much for your wonderful tool. I was able to use it to easily and quickly catalog my mother's collection of scholarly scandinavian books. The cloud feature is wonderful, as I am now able to share the library with universities who are interesed in receiving the books. I had originally planned to use a spreadsheet and photos, uploading it to dropbox, but this is so much better.
Thank you so very much.
Thank you so very much.
Jul 25, 2025
Great book cataloging
Love the barcode scanner. Brings up all the info about the book. if you have a big book collection try this app.
Jul 21, 2025
So easy to use!
I helping a friend move & she is reducing her considerable library for the first time in 20 years. Over 500 books scanned by CLZ and easily tagged for keep, resell, & donation. So easy to use! The CLZ app makes all of that possible. I like the desktop version for modifying or editing any folders or books but quick fixes.
Jul 18, 2025
Perfect Library Organizer
For those like me who are obsessed with books (children’s books in my case), and have a copious amount, this is perfect for keeping track of what I have so I can stop buying doubles!
Jul 10, 2025
App
Librarian recommend.
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.
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.
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.
Jun 25, 2025
Absolutely love this app
Allows me to keep track of my books, which ones I have read, how I rated them, which location in the house I can find it. The team have made some great improvements such as reading the ISBN number when there is no barcode. Well worth the yearly subscription.
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.
Jun 23, 2025
I love this app!
This has helped me keep track of my books and not by doubles it is the best app in the world.
Jun 23, 2025
Excellent
Best app ever and staff are very helpfull.
Jun 23, 2025
App very helpful when buying books
This app has saved a fortune by allowing me to check whether I have already bought already.
Jun 20, 2025
This app is a game changer!
I was assigned the task of cataloging my father’s library, a retired professor with over 3000 books. I have tried to use other apps and struggled. This app is a game changer and a life saver! It’s so easy to scan multiple items and finds titles quickly, it syncs with my computer, and I was able to create a print out to show my father the list with Book cover images! There is no other app like this one! Thank you for creating this!
Jun 9, 2025
Powerful inventory app
CLZ Books is a powerful inventory app for serious book collectors, offering customizable cataloging, barcode scanning, and cloud backup. The interface is user-friendly, and customer support from the founder and owner Mr.Alwin is top-notch, though advanced features may require some learning.
Rating: 5/5
Recommended for: Dedicated collectors and libraries.
Rating: 5/5
Recommended for: Dedicated collectors and libraries.
Jun 6, 2025
ABSOLUTELY AWESOME
I’ve used CLZ books for many years and have approximately 3000 books on my list. I’ve had very few problems over the years but when I have I received almost immediate response. Recently when I tried to open the app on my phone it indicated I needed to subscribe plus it didn’t recognize my login information. I had been syncing my devices regularly but hadn’t noticed that changes weren’t showing on my phone. My iPad was working properly, it was just my phone.
After several back-and-forth emails the technician found, fixed the problem and told me what to do on my end. Both devices are working properly now and synced as soon as I open my phone.
I totally recommend this app, you can’t go wrong.
After several back-and-forth emails the technician found, fixed the problem and told me what to do on my end. Both devices are working properly now and synced as soon as I open my phone.
I totally recommend this app, you can’t go wrong.
Jun 6, 2025
Absolutely love this app
CLZ Books and their Support are awesome.