CLZ Books - library organizer

In-app purchases
3.79K reviews
Content rating
PEGI 3
100K+
Downloads
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About this app

Easily catalog your book collection. Automatic book details, cover art and estimated values.
Just scan ISBNs (barcode or text) or search our CLZ Core database by author and title.

CLZ Books is a paid subscription app, costing US $1.99 per month or US $19.99 per year.
Use the free 7-day trial to try all of the app's features and online services!

== 2 easy ways to add books: ==
1. Search our CLZ Core by ISBN:
You can either scan ISBN barcodes or scan the ISBN numbers using OCR
Guaranteed 98% success rate on ISBN lookups!
2. Search our CLZ Core by author and title

Our CLZ Core online book database automatically provides cover images and full book details, like author, title, publisher, publication date, plot, genres, subjects, estimated pricing, etc..

== Edit all fields ==
Modify all automatically provided details from Core, like Authors, Titles, Publishers, Publications Dates, Plot descriptions, etc.. you can even upload your own cover art (front and back!). Add personal details like condition, location, purchase date / price / store, notes, etc..
Create your own Custom Fields so that you can catalog information for which the app does not have a built-in data field.

== Create multiple collections ==
Collections will appear as Excel-like tabs at the bottom of your screen. E.g. for different people, to separate your physical books from your ebooks, to keep track of books you sold or have for sale, etc...

== Fully customizable ==
Browse your book catalog as a list with small thumbnails or as cards with big images.
Sort any way you want, e.g. by author, title, publication date, date added etc.. Group your books into folders by author, publisher, genre, subject, location, etc...

== CLZ Cloud storage ==
Sync your data to the CLZ Cloud, to:
* Always have an online backup of your book organizer database.
* Sync your book library between multiple devices
* View and share your book collection online

== Got a question or need help? ==
We are always ready to help or to answer your questions, 7 days a week.
Just use "Contact Support" or "CLZ Club forum" from the menu.

== About CLZ ==
CLZ has been developing collection database software since 1996. Located in Amsterdam, the Netherlands, the CLZ team now consists of 12 guys and one gal. We're always working to bring you regular updates for the apps and software, and to keep our Core online databases up-to-date with all weekly releases.
Our other CLZ apps:
* CLZ Movies, for cataloging your DVDs, Blu-rays and 4K UHDs
* CLZ Music, for creating a database of your CDs and vinyl records
* CLZ Comics, for your collection of US comic books.
* CLZ Games, for creating a database of your video game collection

== What our users say ==

"A fantastically nice book library app that I am incredibly happy with, you really get an overview of the things that need to be sorted out, for a good overview, easy to use and everything works seamlessly. Strongly recommend."
Emmanate (Norway)

"The best I have found. I have over 1200 books and have used a number of book cataloging apps over the years. CLZ Books does the job of keeping track of my library and gets syncing right. Most importantly (speaking as a software developer) they keep improving the app. It’s tough to make a business of niche software products. These folks have apparently figured out how to make a go of it and they keep improving. Kudos to them!"
LEK2 (USA)
Easily catalog your book collection. Just scan ISBN barcodes. (US $20 / year)
Updated on
Oct 12, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    App activity and App info and performance
  • This app may collect these data types
    Personal info, App activity, and App info and performance
  • Data is encrypted in transit
  • You can request that data be deleted

Ratings and reviews

3.36K reviews
Lexi Dew
May 17, 2026
I’ve tried several book‑cataloguing apps and CLZ Books is easily the best. Great value, handles large collections smoothly, and is highly customisable with excellent sorting, filtering and bulk editing. I especially like being able to separate family members’ collections. ISBN lookup works with typed numbers for older books. Clean, intuitive UI and helpful support. One suggestion: smarter default name sort order that assumes last name is the surname would mean fewer manual edits.
3 people found this review helpful
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Beverley Mynott
May 18, 2021
This is a fantastic app if you love reading books. The app is incredibly powerful, with a huge list of features to help you record what books you have read, when you read them, and what books you want to read next. You can also categorise your book collection by genre and subject. The database stores a large collection of books to add to your reading list, or you can add books manually if they are not already in the database. And your book collection syncs easily between the app, the web and the windows version. The app is very easy to use yet also very feature-rich, and I use it every day to update my reading lists, add new books, etc. Having tried several similar apps, I would definitely recommend CLZ Books as the best app for avid readers.
16 people found this review helpful
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Gordon Davie
September 29, 2020
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 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. Highly recommended.
8 people found this review helpful
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What’s new

New:
* Edit screen: My Images: Tap and hold to save them to your camera roll

Fixed:
* After searching and tapping a folder, going back would clear the search
* Edit screen: empty value fields now show as empty instead of 0.00
* More layout fixes for foldable devices