CLZ Books - library organizer

In-app purchases
3.76K reviews
Content rating
Everyone
100K+
Downloads
Content rating
Everyone
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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
Sep 25, 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

3.34K reviews
Geoff Sweet
September 14, 2026
I guess it works okay. If all you're doing is adding books to a personal library, this works great. if you're trying to organize your books, there are some blindingly stupid things missing. For instance, it doesn't show the Dewey value on the scan page. which means you have to go back to your list of books, find the book and look it up. It also doesn't appear to allow you to organize your books by Dewey. Disappointed.
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Denny Cormier
August 28, 2026
Extremely happy with this software so far. It was amazingly easy to move my book collection from another database to this database. The only challenge was updating cover art for some of the books, but even that chore was facilitated by CLZ. This app is way better than my previous app; both the phone version and the online version are considerably more sophisticated.
3 people found this review helpful
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Steve Mosley
August 5, 2026
CLZ Books has been exactly what we needed to catalog all of our many books. I first got it to replace the multi page list of books I had and was looking for that I would carry into every used book store so that I would stop picking up duplicates unintentionally. The ability to quickly add most books by scan and sort them into collections is helping us get a better grasp of the rooms of books we have. Customer service if ever needed is quick and helpful. I can't ask for a better book app.
4 people found this review helpful
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What’s new

Big update today: Add your own extra images to books! Check it out:

* Add up to 5 extra images per book entry
* Set a Description and Image Type per image
* Crop, rotate images and drag them to re-order
* Extra images will appear in the details at the bottom
* Tap to enlarge and then swipe to browse through all images

On top of that we also added:

* New folder options for Has Front, Has Back and Image Type
* A fresh look for the tabs in the Edit Screen