CLZ Books - library organizer

In-app purchases
4.7
3.12K reviews
100K+
Downloads
Content rating
PEGI 3
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About this app

Easily catalog your book collection. Automatic book details, book values and cover art.
Just scan ISBN barcodes or search CLZ Core 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!

TWO EASY WAYS TO ADD BOOKS:
1. Search our CLZ Core by ISBN:
You can either scan ISBN barcodes, ISBN numbers using OCR or use a USB barcode scanner
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, etc..

EDIT ALL FIELDS:
You can even edit the 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!). Also, add personal details like condition, location, purchase date / price / store, notes, etc..

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...

FULL 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...

USE 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.

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

ABOUT COLLECTORZ / 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.

CLZ USERS ABOUT CLZ BOOKS:

"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)

"This is THE ONE. I have a lot of books, and I have been looking for a very long time for a great library cataloging app. A friend of mine showed me this one and… Yes. This is it. So easy to use, so easy to add books and create collections, add covers, anything you want to do. I love it I love it I love it.
Also Customer Service is absolutely terrific."
OolooKitty

"I first gave 5 stars to this in 2018. In 2024, it still delights. If I could give more I still would now. Such a useful book database app which is constantly being improved.
I have had occasion to contact them a couple of times and they have always been courteous, friendly and immediately helpful. I can thoroughly recommend."
Mark Maffey
Updated on
Apr 3, 2025

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

4.7
2.75K reviews
Sue Peek
June 6, 2025
June 2025 - CLZ Books and their Support are awesome. I had a syncing problem between my Android phone and iPad. I hadn’t noticed that changes weren’t showing on my phone, my iPad was working properly. 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 my phone. I totally recommend this app, you can’t go wrong. May 2021 - Absolutely love this app.
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Cayla Kelton
May 25, 2025
the clz team is so thoughtful and helpful, if you have any questions they are available! I have quite a large collection, and this app makes it so so so easy to log everything. their database is extensive, and the isbn scanner is magical! im so happy this app exists, I can stop buying doubles (sometimes triples) by searching my collection before I buy a book! its been so cool to see my collection grow!
1 person found this review helpful
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D. A.
May 22, 2025
Tried the app the first time, and it didn't work well at all (Samsung A52, so an older phone.) Upgraded to a Pixel 9 pro, and it works great. This will help me keep track of my library at home and keep me from double buying books. :)
2 people found this review helpful
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CLZ
May 11, 2025
We apologize for the inconvenience. Can you be more specific please so that we can identify the issue? Don't hesitate to reach out to us at https://help.clz.com/.

What’s new

New in the CLZ Books 10.2 update:
Automatic book values and retail prices, based on average prices on various online used book stores.
* Get Values from CLZ Core, downloaded into the Value field
* Use Update Values from the menu to retrieve/update values
* Get Retail Prices for books, in the new Retail Price field
* See the values in your list view and details panel
* See value stats and top lists in the Statistics screen