CLZ Books - library organizer: iPhone vs Android
CLZ Books - library organizer by CLZ is on both the App Store and Google Play. Here are both versions together: downloads, users, revenue, ratings and chart positions, store by store with totals.
Rating
4.6 ★
3.9k ratings, both stores
Measured
Best rank now
#56
iPhone · 
Books Grossing
Books GrossingMeasured
App Store
App details
App ID
318799163
Publisher
CLZ
Minimum OS
iOS 13.0+
Content rating
9+
Languages
1
EN
Size
30 MB
Google Play
App details
App ID
com.collectorz.javamobile.android.books
Publisher
CLZ
Content rating
Everyone
CLZ Books - library organizer downloads & installs
Both stores, worldwide. Bands are open; exact numbers are free with an account.
| Store | Downloads / day | Lifetime installs |
|---|---|---|
| iPhone | – | 100k+ |
| Google Play | – | 100k+ Measured |
| Total | – | 100k+ Confidence |
How this is calculated
iPhone: chart positions and rating growth per country, anchored on its own Android downloads; lifetime from ratings worldwide × installs per rating. Google Play: the daily change in its exact install count. The total adds every store.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend before Apple and Google take their fee.
| Store | Per day | Per month | Share |
|---|---|---|---|
| App Store | |||
| Google Play | |||
| Total | Confidence | 100% |
Business model: In-app purchase-led
How CLZ Books - library organizer makes money: subscriptions, one-off purchases and ads.
In-app purchases
One-off purchases
/mo
of revenue
Where it ranks now
Both stores, across every country we track.
Ratings
Both stores. Store data, measured.
| Store | Rating | Ratings |
|---|---|---|
| App Store | 4.6 ★ | 109 |
| Google Play | 4.6 ★ | 3.7k 732 written reviews |
| Both stores | 4.6 ★ weighted by ratings | 3.9k |
About CLZ Books - library organizer
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
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
CLZ Books - library organizer iPhone
CLZ Books - library organizer is #56 in Books Grossing in Italy and charting in 1 of 24 countries we track.
Updated 27 Sep 2026 · rankings refresh through the day
DeveloperCLZ
CategoryBooks
PriceFree
Released
Rating★ 4.6 (109)
Version11.0.4
Age rating9+
First seen by us
25 Sep 2026
25 Sep 2026Installs (est.)100k+ worldwide
Rating
4.6 ★
109 ratings
Measured
Best rank now
#56
Books GrossingMeasured
CLZ Books - library organizer on the App Store
App details
App ID
318799163
Publisher
CLZ
Minimum OS
iOS 13.0+
Content rating
9+
Languages
1
EN
Size
30 MB
CLZ Books - library organizer downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. iPhone downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in CLZ Books - library organizer before Apple and Google take their fee.
How this is calculated
Not in an overall Top Grossing chart, only in category charts: each category position is converted to the overall position it corresponds to, then priced on the same rank-to-revenue curve, inside the part of each market the charted apps leave over.
Business model: In-app purchase-led
How CLZ Books - library organizer makes money: subscriptions, one-off purchases and ads.
In-app purchases
One-off purchases
/mo
of revenue
Where it ranks now
Every top chart it appears in across 24 countries.
| Country | Charts | Rank |
|---|---|---|
| Italy | BooksGrossing | #56 |
Apps near CLZ Books - library organizer on the chart
Books Grossing, around #56.
Ratings
App Store, worldwide.
Rating
4.6 ★
109 ratings
Measured
Ratings
109
Measured
About CLZ Books - library organizer
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
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
Latest updates
11.0.4
Fixed:
* Custom Fields: Fixed List/Fixed Button Bar: It wasn't possible to add more than 1 value
More from CLZ
CLZ Books - library organizer Android
CLZ Books - library organizer is #139 in Books & Reference Grossing on Google Play in United States and charting in 1 of 15 countries we track.
Updated 27 Sep 2026 · rankings refresh through the day
DeveloperCLZ
CategoryBooks & Reference
PriceFree
Released
Installs100k+
Rating★ 4.6 (3.7k)
Updated
Content ratingEveryone
Rating
4.6 ★
3.7k ratings
Measured
Best rank now
#139
Books & Reference GrossingMeasured
CLZ Books - library organizer on Google Play
App details
App ID
com.collectorz.javamobile.android.books
Publisher
CLZ
Content rating
Everyone
CLZ Books - library organizer downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Google Play shows an exact lifetime install count; downloads per day are its daily change (measured). When Play hasn't refreshed the count, they come from new ratings and Top Free chart positions. Confidence is the chance the real number is within half to double ours.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
In-app revenue
Worldwide, what users spend in CLZ Books - library organizer before Apple and Google take their fee.
How this is calculated
Not in an overall Top Grossing chart, only in category charts: each category position is converted to the overall position it corresponds to, then priced on the same rank-to-revenue curve, inside the part of each market the charted apps leave over.
Business model: In-app purchase-led
How CLZ Books - library organizer makes money: subscriptions, one-off purchases and ads.
In-app purchases
One-off purchases
/mo
of revenue
Where it ranks on Google Play
Every top 200 chart it appears in across 15 countries.
| Country | Charts | Rank |
|---|---|---|
| United States | Books & ReferenceGrossing | #139 |
Apps near CLZ Books - library organizer on the chart
Books & Reference Grossing, around #139.
Ratings
Google Play, worldwide.
Rating
4.6 ★
3.7k ratings
Measured
Ratings
3.7k
Measured
Written reviews
732
Measured
About CLZ Books - library organizer
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
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
What's new in 11.1.3
Fixed:
* Updating from Core could freeze the app
* After tapping a suggestion from the search in main screen, using Back would make the app go back to the top of the list
* A couple of layouts for foldable devices weren't displayed correctly when using 3-button navigation
* Update from Core: some books were erroneously reported as updated
* Updating from Core could freeze the app
* After tapping a suggestion from the search in main screen, using Back would make the app go back to the top of the list
* A couple of layouts for foldable devices weren't displayed correctly when using 3-button navigation
* Update from Core: some books were erroneously reported as updated