Catalog your book collection with ease!
Automatic book details and cover images.
Just scan ISBN barcodes with your camera!

- Free 7-day trial, then $1.49 per month -

Use our "CLZ Core" central online book database for easy adding of books:
* Just scan ISBN barcodes with your device camera.
* or search our CLZ Core by Author and Title.
* CLZ Core will automatically give you cover images and full book details.
* Author, title, publisher, publication date, plot, genres, subjects, etc..

Use our online "CLZ Cloud" system to:
* Sync your book database between devices (e.g. your phones and tablets).
* View and share your library list online, using the CLZ Cloud viewer website.
* Always have an online cloud-backup of your collection database.
* Sync data to/from our Book Collector or Book Connect software (separate purchase).
* Share your app subscription to other mobile devices, without paying again.

Other app features:
* Keep track of your collection and your wish list.
* Edit book entries to add more details, like location, owner, notes, rating, etc.
* Can't find your book in CLZ Core? No problem, just use Add Manually from the menu.
* Group books into folders, e.g. by author, publisher, genre, year, etc...
* Sort book lists by author, year, title, purchase date, nr of pages, etc...
* View your collection as a list or as a "cover wall".

* Questions or concerns? Just contact us! *

We love to hear your feedback, we are here to help with any problems or concerns.
In the app, tap the menu icon top left, then choose Contact Support.

* Subscription pricing *

CLZ Books is a subscription app. You need an active subscription to use the CLZ Books online services:

* CLZ Core:
For adding books by ISBN or by author and title
* CLZ Cloud:
For online backups, syncing between devices, syncing with Book Collector or Book Connect, and for viewing/sharing your book list online.

* $1.49 per month, when paying monthly
* $14.99 per year, when paying yearly (~ $1.25 per month)

You can start a 7-day free trial from the app's start-up screen. The free trial automatically continues into the "Pay Monthly" subscription, unless you either:
- Switch to "Pay Yearly"
- Cancel through the App Store.

About auto-renewable subscriptions:
* The payment will be charged to your iTunes Account when you confirm the purchase.
* The subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.
* Your account will be charged for renewal within 24-hours prior to the end of the current period. Automatic renewals will cost the same price you were originally charged for the subscription.
* You can manage your subscriptions and turn off auto-renewal by going to your Account Settings on the App Store after purchase.
* Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Terms of Use:

What’s New

Version 5.0.2

CLZ Books 5.0: Vee Five is alive!

* CLZ Books is now a subscription app, costing $1.49/month or $14.99/year.

Users who have purchase the app earlier will automatically receive a life-time "Basic"-level subscription to access their existing CLZ Core and CLZ Cloud services.

* Now supports and syncs multiple collections !

Manage multiple "sub-collections" within your database. Use the menu to add a new collection, switch between collections or manage them.
Sync multiple collection through the CLZ Cloud, e.g. to/from the Book Connect cloud-based software or the Book Collector desktop software.

* Automatic cloud-syncing of your own “custom” images

No more need to "force" the upload of your own images through the Edit screen. Once you replace an image, the image is automatically flagged as "Custom Image" and will automatically sync to the CLZ Cloud.

* Re-designed top-bar:

- The menu icon now includes the "CLZ Books" mark (bigger tap area)
- The "Collection Status" filter button has been moved to the right

* Re-designed main menu:

- Now clearly shows your Account and Subscription Status at the top. Tap to manage.
- New "Maintenance" screen that now contains:
-- the "Clear Database" option
-- the "old Import from Book Collector" option
-- the new "Update from CLZ Cloud" option (only use when instructed by support staff)

* Fixed:
- Crash when the collection status was edited.

Ratings and Reviews

4.8 out of 5
499 Ratings

499 Ratings

@Sigil ,

The app works.

The app itself is great. I purchased it and the comic book app many years ago. I did not use them, because I went with Mac based solutions Delicious and The Librarian. That said, this new version does not recognize my purchase. However, the Comic Book app did recognize my previous purchase. I want to purchase the Movie and Game apps. Unfortunately, I won't be purchasing them until this is resolved. I hate IAP purchases, because I have had this happen several times before. I have a lot of Media and it needs to be cataloged. I move a lot and things go missing.

Developer Response ,

Of course, if you paid for the app in the past, you do not have to pay again. Please continue the conversation that you already had with Support, so that we can help you unlock the app.

Gmablake ,


I love this app. It is exactly what I need to catalogue my books. It’s very flexible and easy to use but provides lots of options for sorting and placing in folders. It also has multiple views of your information. I was really happy to have the free copy to check it out before buying the full version. It does everything I want. I have thousands of books so having the scanner work well is huge. I also like having it on multiple devices. The sync works well. I have been looking for an app like this for years. Can’t say enough good things.

Anton Rang ,

Very good catalog

I've been using this for a few months now for my modest (~5000 books) collection. The iPhone and iOS apps are handy for on-the-go access, adding books, and basic editing, though the Mac app is more full-featured. Synchronization has been flawless. The ability to check my catalog while in a bookstore is invaluable.

The quality of the data retrieved by ISBN and author/title lookup varies, so I find myself cleaning up a fair number of entries. Over time I've submitted some corrections, but it's a slow process.

Developer Response ,

Thank you for your great 5-star review Anton! Very happy to hear you've had a good experience with the app (and macOS software). We'll keep working on the Core Book database to make it better, together with your corrections. Thank you for your input!

If you have any questions about submitting, you know where to find us: !


Bitz & Pixelz BV
35 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
In-App Purchases
  1. No Limits $14.99
  2. CLZ Books (Pay Yearly) $14.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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