BookCAT alternative
We import your BookCAT database
Import your BookCAT data into Book CollectorJust export to XML from BookCAT, then import that XML.
Then sync to our free CLZ Cloud ... ... to use your data in any of the 3 solutions below.
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
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.
Reviews from customers
Sep 1, 2023
Exceptional book database!!
I have used this program for over 4 years now! Works immediately after downloading and networks with the current ISBN database. Responsive customer service is another plus. IMHO it’s the best book cataloguing app out there!
Jan 17, 2023
The best book cataloguing app available
By far the best book cataloguing app available, I've tried several and clz blows them all out of the water. If they had a lifetime membership subscription I'd even take it because it's so good. Customer service is extremely helpful if you have any questions as well. Couldn't recommend it more.
May 10, 2022
The best book app
Best book catalogue ap ever So easy to keep track of my books.
Mar 19, 2022
100% Worth the money
A great app! I had been looking for a book cataloging app and the ones I had seen were fine. I was hesitant to purchase this app when I came across it, thinking that maybe paying $20+ wouldn't be necessary just to have a list of books on my phone, but as I played around with the free version, it really was what I was looking for. I bought this one and the CLZ Movies and I never regretted it! It was 100% worth the money. The customer service is also excellent. They're very courteous and helpful.
Mar 13, 2022
Great tool
I just downloaded it today and I already love it. Best book cataloguing app I've found. Gives you lots of customization abilities.
Sep 21, 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.
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.
Aug 10, 2021
Great book catalogue
Love working with this app. Books can be entered by scanning their barcode, so it’s a powerful bookcataloguing system that’s very quick and easy to use. I make heavy use of options that allow you to personalize the settings and stored details, so it’s tailored to my needs.
Over the 7 years that I’ve used this app, I’ve seen lots of improvements. The developers are in-tune with their customers—if we ask for new functionality, it’s actually considered and often implemented. I even had the owner email me when I had an issue!
Over the 7 years that I’ve used this app, I’ve seen lots of improvements. The developers are in-tune with their customers—if we ask for new functionality, it’s actually considered and often implemented. I even had the owner email me when I had an issue!
Jun 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+++++.
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+++++.
Jun 24, 2021
Amazing App and Amazing Support
So, I’ve had this app for multiple years. Completely recommend to everyone and I haven’t found another app that provides the same level of support and app creation. There are so many options for collectors and for casual book-lovers to personalize your book catalogue.
So, recently I had a issue with the app. My accounts weren’t syncing to the cloud. So i sent in a email support request at 8:28 am and received a reply at 8:41! I didn’t have to sit for hours worrying. They guided me through what I needed to do and have access on their end to see what the problem is. My issue had been solved at 10:00 am on the same day!!
I cannot thank the customer support agent enough for the fast service and the great guiding!! 100% would recommend this app!
So, recently I had a issue with the app. My accounts weren’t syncing to the cloud. So i sent in a email support request at 8:28 am and received a reply at 8:41! I didn’t have to sit for hours worrying. They guided me through what I needed to do and have access on their end to see what the problem is. My issue had been solved at 10:00 am on the same day!!
I cannot thank the customer support agent enough for the fast service and the great guiding!! 100% would recommend this app!
Jun 24, 2021
Excellent choice
I would like to thank Alvin, Sytske and the team for all assistance given over the past 5 years; your book cataloguing software proved an excellent choice for recording some 7,500 books in an important legacy private collection. The ability to then share the catalogue with a wide variety of potential inheritors and auction houses has made the final distribution of the collection both straightforward and effective. I will certainly recommend Collectorz in future where appropriate.
Jun 23, 2021
Five star cataloging software!
I’ve been using CLZ software (mainly Book Collector, but also Music Collector and Movie Collector) for very many years in both the mobile form and as a desktop app. No other book cataloging software comes near this in terms of quality, ease of use and value for money. Although I’ve rarely needed to use customer service, I have found that they offer a fast and friendly response to any queries. As a collector I have over 6000 books and I would be lost without this software.
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!
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!
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.
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.
Jan 3, 2021
Great Book Cataloguing App
Great Book Cataloguing App
I really like the CLZ Books app. Previously I had a free app that was a lot of work. What I really like about CLZ is that I don’t have to keep typing in the location of books on the same shelf. The next book I enter automatically
is at the same location and I can change locations when I want. It seems like a small thing but actually saves quite a bit of time. Previously I had a free app that required typing in the location for each book.
Another feature I like is the large amount of books available when I search by title so I don’t have to manually enter very many books.
Finally, the colors on the list of my books is a nice touch. I am very happy I found your app which makes cataloguing books fun rather than work.
Nov 30, 2020
Best book cataloguing software I’ve used!
Best book cataloguing software I’ve used!
I tried 3-4 other book cataloging apps before I found CLZ and it’s computer based sister Book Connect, but all those others had their limitations and seeming to be aimed at novels. I needed a serious app to catalogue my very late research and academic library and this was it. I now have over 3000 books catalogued and add every new book before putting it on my shelves. It does not take long to learn how to use this app and customer support is excellent with replies often coming back in minutes. I log all my books with Book Connect on my desktop and easily sync to CLZ on my mobile. Have you ever been in a nook shop and wondered if you had a particular title? You either buy it and get home to find it is a dupe or don’t buy it, get home and kick yourself because you didn’t have it. CLZ prevents this and if it stops you buying one dupe a year it has paid for itself. Shopping online for titles? Check if you have the title with Book Connect on your computer. I love it and have recommended it to loads of my friends.
I tried 3-4 other book cataloging apps before I found CLZ and it’s computer based sister Book Connect, but all those others had their limitations and seeming to be aimed at novels. I needed a serious app to catalogue my very late research and academic library and this was it. I now have over 3000 books catalogued and add every new book before putting it on my shelves. It does not take long to learn how to use this app and customer support is excellent with replies often coming back in minutes. I log all my books with Book Connect on my desktop and easily sync to CLZ on my mobile. Have you ever been in a nook shop and wondered if you had a particular title? You either buy it and get home to find it is a dupe or don’t buy it, get home and kick yourself because you didn’t have it. CLZ prevents this and if it stops you buying one dupe a year it has paid for itself. Shopping online for titles? Check if you have the title with Book Connect on your computer. I love it and have recommended it to loads of my friends.
Jun 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!
Apr 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.
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.
Aug 26, 2019
A great app!
I had been looking for a book cataloging app and the ones I had seen were fine. I was hesitant to purchase this app when I came across it, thinking that maybe paying $20+ wouldn't be necessary just to have a list of books on my phone, but as I played around with the free version, it really was what I was looking for. I bought this one and the CLZ Movies and I never regretted it! It was 100% worth the money.
May 26, 2019
The best on the market
This is the best book cataloguing app on the market. I have all CLZ products on my PC, and I am more than satisfied. I would give it 7, 8 or 9 stars if I could.
Sep 6, 2017
I Can't Imagine Better
This app is a robust, easy to use, companion to the desktop version of this book cataloging database. The support is excellent. Moreover, the communications with the firm's leadership are friendly, evidencing that the entire team likes what they are doing.
Mar 6, 2017
Great app
Not the prettiest app, but the scan function is way superior to every other book cataloging apps I've tried.
Feb 12, 2017
So much better
I use to use BookCat - this is better since I can sync across many devices.
Jul 20, 2016
A joy to use
I downloaded a dozen or so book cataloging apps to try them out. Mostly, they went from bad to worse. CLZ Books was superlative: user-friendly, smart, fast, and intuitive. Keep up the good work!
May 17, 2016
Wonderful! Catalogue your books
This and its desktop counterparts go from strength to strength. They interact seamlessly via the cloud and hugely facilitate the making and keeping of a book catalogue. Since you can carry the catalogue in your pocket it will pay for itself in prevented duplicate purchases. There is room for improvement; I would happily pay a modest amount extra if Dewey numbers were routinely included in the online catalogue; at present the majority of my non-fiction books have them, but many don't. The subject indexing field is chaotic and anarchic. It seems that users can dream up their own format for each subject, with the result that one subject may have several labels differing only in punctuation or some other trivial respect. There must be a better way. The handling of diacritical marks is deficient. The book price fields give no indication of the currency: this makes the field essentially useless if one buys in several currencies. A way of printing labels including spine labels would be a useful addition. However the app is continually being improved over the years. Support is excellent, with prompt and intelligent responses. It's by far the best solution I know of for a private collection or small library.
Feb 22, 2016
Best I've found
While it's not perfect, this is the best application I've found for keeping a book catalog synchronized between several Mac computers, iPad and iPhone. I recommend it; if you need very detailed records, the Mac or Windows application is more complete and works perfectly in conjunction with this one. Barcode scanning for ISBN works well; note that some books (mainly from the 1980s & 90s) have a UPC code instead, which doesn't identify the book.
Jul 11, 2013
A Great Program
This book app is worth every cent (especially if it can prevent you from buying duplicates!) and with the new update has become increasingly user friendly. The design is very laid back and easy to use. Definantly the best book cataloguing app out their. One feature I would like seeing however is database totals so I can view the worth of my collection.