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ISBN Database Software - catalog your books by ISBN

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

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
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 27, 2021
Perfect for Organizers!
I love to organize and as a homeschool mom I have nearly 1,000 books. Keeping them organized would be such a chore but this app makes it so easy! I love being able to scan the ISBN of a book to add it to my booklist. And pro tip: if you have lots of older books with no barcode, I’ve found the fastest way to enter them is to go to the keyboard for typing it in, and then click on my microphone and quickly say the numbers. Works great! — GoodHoll on CLZ Books
May 20, 2021
Great Book inventory product
I own over 540+ books and this does a nice database job. I buy a lot of HISTORY books and computer books, this works great to prevent duplicate purchases. When looking at new wish books like the wish list for recall when asked for gift ideas. Like the detail and the book cover pic to compare if purchase or already own. Easily search when shopping especially mobile. Alwin & Team constantly adding new features Via enhancement updates. If there is a problem The Team addresses it very quickly although i have owned for many years and haven’t found too many issues mostly just added enhancements. Highly recommend, cost effective and enjoy it so much purchased several other of his inventory products. Couldn’t add to collections without this product And adding via Title or even better ISBN code is great. App is flexible and allows for cover graphics override so can match exact ownership version. Highly enjoy & Recommend. — Barmeister on CLZ Books
April 25, 2021
A joy to use
I have really enjoyed the use of your products over the years. The Books and Comics in particular made cataloging my collections a whole lot easier to finish and sort. It was really nice that I was able to add most items without having to enter each piece of data separately, like some of the other software out there.
What seemed like an endless task of adding 3500+ paperbacks and hardcover, became a joy to do. The use of a barcode reader just made it that much faster. I still had to manually input a fairly large number of books as they were printed before the barcode system came into being, but even that, for the most part, was reasonably easy to do by using the ISBN. A bit tougher to enter the ones without any ISBN listed, but there the search by title and author made things doable. — Per Olsen (USA) on Book Collector
April 22, 2021
Intuitive and user-friendly
I also wanted to take a moment to thank you for creating the Book Collector software. I have an extremely large book collection that I need to downsize, and I was hoping to find a tool that would allow me to easily catalog my books so I could determine which ones to sell, which ones to bring to the used bookstore, and which ones to keep. I also wanted to capture other details about my books. I discovered your website by pure chance through a Google search, and I am so happy I did since your software does everything I wanted to do (and more)! I having been working with data for 35 years and find that most tools lack the functionality that users would like, but that is not the case with Book Collector. It is very intuitive and user-friendly, and I have been able to figure out how to do something without looking at the manual. The app is a life-saver too since I found it challenging to use my web cam to scan the ISBNs. With the app synchronization, this work is very easy.
Thanks again for the wonderful resources you have created. — Jim V. (USA) on Book Collector
March 08, 2021
Home library
I have a home library of around 350 books, and growing. It was getting to the point where I didn't know which books I owned already. I got CLZ as my home library database and have really enjoyed having it. It's super easy to scan books in or type in the ISBN, and it's easy to search as well. So when I'm at the book store I can quickly see if I already have a book or see what books I'm missing from a particular set. Definitely recommend for anyone with a large home library. — Lauren Rose on CLZ Books
November 15, 2020
Stable and Mature Product
The app was able to easily read bar codes from the last 20 years. Took a little longer with 30-40 year old books. A lot of books had UPC codes and the app easily identifies them. ISBN searches were a breeze. That I could add cover pictures was great. Only complaint: the title search engine is weak. One letter mistake and it couldn’t find a book - “if” instead of “of”. The I and the O are next to each other on my iPhone. But overall I was able to catalogue 99.9% of my more than 1000 books! — The Nomad Reader on CLZ Books
November 02, 2020
Awesome app & excellent support!
I've been using this app for about 2 months, and couldn't be happier. I'm using the app in a slightly unconventional way - not for a personal book collection, but for the school's PTO book collection. The cloud feature of the app allows me to upload all our books, for parents / students to view what's available, and the flexibility of the app allowed me to customize each record to allow for people to select books they wanted.
Populating the app was very simple by scanning ISBN barcodes, and even when a barcode wasn't available, a manual entry was very easy to do. I did do some editing of records to ensure consistency across our database, but this too was very easy. I also edited a number of cover images by adding my own - again very simple a straightforward!
I highly recommend this app. Not only is it comprehensive yet simple, it comes with a first class support team. On occasions when I have had questions, I have dealt with three different support analysts, and each has been highly responsive, knowledgeable and friendly. You can't go wrong with this app! — Paulaclaire on CLZ Books
October 22, 2020
Works like a charm
The ISBN feature works like a charm! — Kofi Adu-Boahen on CLZ Books
September 29, 2020
Highly recommended
This is the fourth CLZ app I have used and they're all of equally high quality. Easy to use and constantly updated so they keep getting even better. Adding a book is simple - just type in the ISBN or title (or scan the ISBN bar code) and unless it's a really obscure book the details pop up from the huge database. Even if your collection is in the thousands this app will store them with ease and display them in any order you choose. — Bravie2001 on CLZ Books
August 20, 2020
Books in Collection
I Like the fact That I’m able to scan my Books To see How many I Have in my Collection. That way I Know What Books I Have. — Kara Phillips 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
March 16, 2020
Great app with related eco-system!
Using this app, the web based Book Connect as well as the companion CLZ Barry (ISBN barcode scanning) I have documented over a 1400 books for my father’s estate. It worked fantastically well! With the collectorz software we were able to keep the books we wanted and sell the rest creating the needed lists and views of the books. Can highly recommend this app and the rest of the collectors software! For entering a bulk number of books with ISBN the CLZ Berry + web based Book Connect works best, but to quickly get an overview and find a book this app is great! — MartinViking on CLZ Books
January 26, 2020
100 books in under an hour
I downloaded this app yesterday to help me scan the ISBN numbers for a ton of books I'm selling on Amazon. I managed to scan around 100 books in under an hour, upload the data to the cloud and then download the book data in CSV format which made adding products to Amazon much faster. This app is so easy to use and well designed. I'm using the free 7 day trial but I'll definitely be buying the 12 month subscription. — Tarik Davis on CLZ Books
January 21, 2020
Thank you CLZ!
I am amending my review to reflect the wonderful customer service I have received, as well as the functionality of the app. Of all the apps I tried to catalog my antique book collection, CLZ Books is my favorite. I like all the various data you can input, including reading date and price. My collection is from well before ISBN numbers (being published prior to 1900), so ease of manually inputting all of the data I want is important to me. I did try out scanning on one current book and it worked very well, but I haven't explored that side extensively. Edited to add, I just added a sci-fi/fantasy collection and used the ISBN scanner and was wowed by the plot summaries that came up! It's so fun! — RockyMtnSky on CLZ Books
November 17, 2019
Perfect voor de bibliofiel
Eenvoudig scannen, uitgebreide ISBN databank, overzichtelijke ordening, goede zoekfunctie. — xbydljgyhg on CLZ Books
October 18, 2019
Book Collector and CLZ
We subscribed to Book Collector over 15 years ago and had very good support from the company. We have since switched over to CLZ because our desktop computers have aged with us. We have had very prompt and succinct responses from their President, Alwin Hoogerdijk regarding our questions and concerns. We are very excited about the new App, since we can now use our iPad camera to scan each ISBN number that then gives you all the information you need and a beautiful cover picture for each book. We will finally be able to complete our collection without duplication of titles, and locate each volume quickly for reference, all in the palm of our hands.Thanks Alwin! — Wycinanki on CLZ Books
October 11, 2019
DE oplossing om mijn boekenverzameling overzichtelijk te houden
Al heel lang verzamel ik pop-up boeken..Eerst wist ik nog wel welke ik al had en welke niet, maar toen ik dubbele ging kopen maakte ik in Excel een bestandje en printte dat uit en nam dat elke keer mee....aangevuld met handgeschreven informatie. Maar toen ontdekte ik Collectorz.com, echt geweldig!!!!!!
Alle boeken staan er (bijna) en nu kan ik zelfs met mijn telefoon in de winkel zien of ik een boek al heb door het isbn te scannen. Ontzettend blij ben ik er mee , het is heel gebruiksvriendelijk en jullie support is ook snel en adequaat, als het nodig is. — Anneke Eggink (Netherlands) on Book Collector
September 12, 2019
Great app, easy to use, wonderful support
I’m using this app to catalogue my collection of over 1,000 cookbooks. Scanning the ISBN numbers with my iPhone has made this task much less daunting. I can also customize my results to my way of liking. Support is immediate and knowledgeable. Highly recommend this app! — Nrupup on CLZ Books
September 09, 2019
Nothing’s perfect, but some things are close
I tried three other apps before I settled on this one for cataloguing my fairly extensive book collection (around 3k volumes). The deciding factors were: ease of use, particularly in finding relevant catalogue records from ISBN with or without barcode; use on both iPhone and iPad (synchronised, obviously); some potential for additional bespoke data items I might want to add; and good customer service from the developers. This is the app that ticked all those boxes.

The interface is good, easy to use, and I’ve added a lot of records very quickly, at the shelf with my iPhone. They often need editing (different editions, covers etc), but this is done easily and effectively. Synchronisation is excellent, and indeed you can access your database through the web interface, and there are Windows/Mac versions (at a price). I haven’t fully explored the additional data fields available, but they seem good. And as well as seeing a number of reviews which mention the excellent customer service, I’ve experienced it myself, with very full engagement from the developer with the issues I’ve raised - none of which have been major.

Nothing is perfect, and there are things that could be improved. You can’t do multiple item edits on the iOS version (you can on the desktop versions), eg to overwrite all “genre” entries across a number of records. There are some slightly awkward user interface issues in inputting records (issues the developer has agreed to consider). But I have confidence that the app will improve - it’s regularly updated - and it’s building on a very solid basis. So overall - I’m very happy. And I don’t say that about many software products! — Ben0779 on CLZ Books
August 17, 2019
Muy buena aplicacion
Muy buena aplicacion y muy completa. Puedes agregar todos los datos necesarios: Isbn, codificacion Dewey, clasificacion por generos, etc. — Felipe Diaz on CLZ Books
July 23, 2019
Works great
Brilliant app for categorizing your book collection. Recognizes most books via ISBN barcode, even non-english books. Author and title search often find similar books if your barcode is not the same. Full manual entry also works.
Support answers quickly and politely even to questions that can be found in the manual. — Jorn Haugland on CLZ Books
June 16, 2019
Thank you CLZ!
I am amending my review to reflect the wonderful customer service I have received, as well as the functionality of the app. Of all the apps I tried to catalog my antique book collection, CLZ Books is my favorite. I like all the various data you can input, including reading date and price. My collection is from well before ISBN numbers (being published prior to 1900), so ease of manually inputting all of the data I want is important to me. I did try out scanning on one current book and it worked very well, but I haven't explored that side extensively. I am excited to unpack the rest of my collection and get them entered into CLZ Books! — RockyMtnSky on CLZ Books
May 13, 2019
I love this app!
So much easier than the spreadsheet that I was using to track the books in my collection, and books that I was interested in. You can scan the ISBN or type it in for books that do not have the barcode. The app then pulls in most of the books info and a cover image. — Dave West on CLZ Books
April 18, 2019
This app is excellent
It allows me to scan in most of my book collection using the ISBN barcode. A small minority of my collection is not in the database yet, but inputting these is not difficult. Finally, I can download a custom CSV of my library to make a spreadsheet. The app interface is efficient and pleasant to interact with. This is app is an ideal took for a book collector like myself to use to catalog a personal library. — Sean Sovine on CLZ Books
March 17, 2019
Best Book Organizer on the Market
I’ve tried two other apps to keep track of my huge book collection and have been disappointed... until now! Finally, someone who gets it! Easy input by scanning the ISBN barcode (for most books), or typing in the title. Contains more information than other apps by linking to the Library of Congress. User friendly in that all data can be manipulated to meet specific requirements. Thumbnails are included and can be changed if needed. Pick lists are editable, too. Try it, you’ll like it! — Consumerpaul on CLZ Books
February 09, 2019
Going well
Excellent app for books especially with visible ISBN barcode ;-) Have added 200 today. — oldhutch on CLZ Books
January 29, 2019
Einfach zu verwalten
Sehr gute App, einfach zu verwalten, Erfassung über Handy-Scan oder manuelle Eingabe der ISBN. — Dirk van Lyrop on CLZ Books
November 24, 2018
Scan and add, done!
I used to write down the ISBN's of books I wanted on my wish list. Now I just scan and add them to my wish list in seconds. Great program and phone app. — Dave Bakke on CLZ Books

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