# CLZ Books - library organizer — user reviews > 487 indexed App Store user reviews of CLZ Books by CLZ, rated 4.80/5 from 2,582 ratings. - Source: https://appshunter.io/ios/app/clz-books-library-organizer/id318799163/reviews - App overview in markdown: https://appshunter.io/ios/app/clz-books-library-organizer/id318799163.md - Rating breakdown: 5★ 2,274 · 4★ 215 · 3★ 50 · 2★ 12 · 1★ 31 ## What do users think of CLZ Books? Overall sentiment: positive **Pros** - 📚 Excellent book cataloging app - 🔍 Helpful for avoiding duplicate purchases - 🔖 Ability to organize books into collections - 🔍 Useful for checking book inventory while shopping - 🔍 Comprehensive book database with good coverage - 🌟 Frequent app updates and improvements - 👨‍💻 Responsive and helpful customer support **Cons** - 🐛 Occasional sync issues or data loss - 💰 Subscription model can be expensive for some users - 🔍 Limited ability to add custom fields or notes - 🔍 Difficulty finding older books without ISBNs **Commonly reported bugs** - Crashes when removing books during sync - Issues with barcode scanning on newer devices **Most requested features** - Ability to track reading progress or notes - Option to export data in more formats - Improved search and filtering capabilities - Integration with other book-related apps or services ## Newest reviews (19 of 487) ### 4/5 — First Impressions fantastic then I hit a lot of “not founds” *2026-07-22, version 11.0.1* I found the speed at which one could add books was terrific. When I had a formatting error moving my Goodreads collection I simply pointed the camera at my screen where there were 200 barcodes. It just went ping, ping, ping and in a minute it identified most of the books. However quite a few of the books were not found and I came to the conclusion that the isbn database wasn’t as comprehensively full as it appeared. I also couldn’t understand why the “update from core” didn’t work to bring back the cover art without the barcode. It can find the books from title and author so why not provide a selection of covers. Early days but I’m going to pay the subscription because I’ve had $20 worth of fun from it. I just don’t understand why the developers can’t scrape data from the library of congress or the British library to get all the info of every book. ### 5/5 — Smooth Transition From Readerware *2026-06-22, version 10.7.3* Just moved about 4000 entries from the now discontinued “Readerware” and the move could not have been easier using the CLZ tool. Effective concept of Core Collection is well considered. More to come as I explore ### 2/5 — Disappointing *2026-06-15, version 10.7.3* Not many of the independent books I have in my library that have isbn numbers are findable and i have to enter the majority of information myself and I cannot include pictures of the book, so it’s a blank cover. Very disappointed. Will start looking for another way to catalog my books. ### 5/5 — Phenomenal Books Database *2026-06-15, version 10.7.3* Over the years, I have used several database applications to catalog my collection of books. CLZ Books has joyfully surpassed each of them. I am completely satisfied with its intuitive look, feel and ease of use. I would highly recommend it to anyone looking to keep track of their personal library. ### 5/5 — Book Lover’s Dream *2026-06-14, version 10.7.3* I love how easy it is to keep track of my TBRS ### 5/5 — A Great Resource *2026-06-08, version 10.7.3* Indispensable to anyone with a large personal library. ### 5/5 — Great app *2026-05-29, version 10.7.3* I have used this app and desktop version for several years. Occasionally I find a query but the response is always speedy and helpful. I highly recommend all CLZ organiser packages. ### 5/5 — Great app! *2026-05-23, version 10.7.3* I’ve been using CLZ Books for twenty years, starting back when it was a Windows app and eventually moving to their cloud platform and mobile apps. With more than 2,000 books in my collection, their apps make it easy to keep everything organized across all my devices. I use CLZ to track books I want to buy and read in the future, but also to rediscover books already in my collection that I want to read again. I also share my cloud link with friends so they can browse my collection and find ideas for books they might want to read. ### 5/5 — Great app *2026-05-23, version 10.7.3* I own both books and movies. This app is very smart in finding the ISBN on a page full of text. For books without an ISBN, there is an add book by title or author. Also has an add manually for those books it can’t find in its catalog although this has only happen twice in the ~500 books I’ve entered. I used the tag option to categorize my books with my own personally created categories and this has worked well so far. It also gives the number of books in each tag. Only took a few hours to enter the number of books I have in so far and I’m not quite done yet. I also like that it gives list price and current value of the book. There is also a link if you want to see if the book is on eBay. I pretty sure as time goes on I’ll enjoy this as much as the movie app in I have entered my ~2700 DVDs. I would recommend this to anybody with a lot of books who wants to organize their collection. One final note is they have a free backup to the cloud. Enjoy! ### 5/5 — Fantastic App! *2026-05-23, version 10.7.3* The best book cataloging app I’ve tried so far. This app is extremely customizable to your needs. My favorite feature is the shake to pick a random book. My son loves it and I love not having to read the same book night after night after night. ### 5/5 — Best for home family library *2026-05-15, version 10.7.3* Perfect ### 5/5 — Support *2026-04-28* Excellent and responsive support. Issue was resolved quickly. Still early in my use of the app, so I’ll share more feedback ### 5/5 — What a great app *2026-04-20, version 10.7.3* I’m in my senior years which means 2 things. 1. I have collected a lot of books through the years. And 2. I’m not as sharp as I used to be. This app sorted out my library extremely well , efficiently and graphically smart. Love it. And 2. The folks at CLZ.provided excellent support to sort out my age addled brain, for which I thank them very much. Both product and support are well deserving of my ranking. Excellent. ### 5/5 — Beste Bücher-Datenbank, bester Support - einfach perfekt! *2026-04-19* Ich habe die CLZ-Datenbank vor vielen Jahren von meinem Mann geschenkt bekommen, nachdem ich mir ein Buch doppelt gekauft hatte – und war von Anfang an begeistert. Seitdem organisiere ich wirklich alles darin: Reiseführer, Kochbücher, Hörbücher und sogar Straßenkarten. Besonders toll finde ich die vielen Felder, die sich ganz flexibel an die eigenen Bedürfnisse anpassen lassen. Auch die Newsletter sind sehr verständlich geschrieben, Neuerungen werden klar erklärt. Man merkt einfach, dass hier viel Herzblut drinsteckt. Und falls doch einmal eine Frage offen bleibt, ist der Support unschlagbar gut. Ich wüsste ehrlich gesagt nicht mehr, was ich ohne CLZ machen sollte – von mir gäbe es am liebsten 10 Sterne! ### 5/5 — Library on tap *2026-04-14, version 10.7.2* This app is so easy to use and maintain and provides me with exactly the information, index and library of my books. Great app ### 5/5 — Exactly *2026-04-14, version 10.7.2* Awesome app I have scanned all my books and it’s so much easier to see what books I have. ### 5/5 — Great app! *2026-04-06, version 10.7.1* Outstanding app. Scans isbn numbers with your camera and finds extremely obscure books! ### 5/5 — Top Notch *2026-04-04, version 10.7.1* Bloody marvellous, well done sirs. ### 5/5 — Terrific *2026-04-02, version 10.7.1* Now up to 2800 books and counting - a great bit of software backed up by readily accessible support. Congratulations ## Most critical reviews (10 lowest-rated) ### 1/5 — Authentication nightmare *2026-06-10, version 10.7.3* “Seems” like a good app. For $20/year, it is clear that is a terrible deal since user account authentication is a train wreck. Search for something like this elsewhere. ### 1/5 — Seems good *2025-12-07, version 10.4.4* Seems good, but I used my AppleID to create the account. But you can’t login anywhere else using the Apple or Google account. It only allows for an email and username and password… Which if you use Apple to create the account, you don’t have a password. It really does look like a great app, but some of the small pieces I would like to use seem more complicated than they need to be, and if I’m going to pay for it, that’s more of a frustration. ### 1/5 — Engaño *2025-09-11, version 10.2.3* En su momento pagué por la App, pero ahora cambiaron la política y resulta que tengo que pagar una suscripción anual o mensual. Un engaño. Deberían cambiar la modalidad para los nuevos usuarios, no para quienes ya habíamos comprado la App. Mal. ### 1/5 — Constantly deleted *2025-03-13, version 10.1.1* I paid for a lifetime subscription quite a while ago. Anytime I open the app, all of my books are gone. It was a lot of work to scan the amount of books I have. Don't waste your money. ### 1/5 — paid but no account *2025-03-06, version 10.1.1* It turns out my account was never created/activated despite my subscription. Tech Support said "show us thw subscription". I sent that and NEVER HEARD FROM THEM AGAIN. So I can't use the app despite paying for it. ### 1/5 — Lost everything *2022-11-04, version 7.4.3* When I found this app about 7 years ago (give or take), I bought the lifetime storage. I have had to call to get my account reinstated. Now, my entire storage is gone and my library deleted and it says I have nothing. Ridiculous. Buyer beware. I’d find another way to house your library inventory. ### 1/5 — Disappointed to no end *2021-10-28, version 6.6.1* I loved this app. But ever since 2021 this app will not work at all. No ability to reset the app unless you try their email which never responds. Sadly I gave up on this app and wish they would correct everything that is ruining this amazing database ### 1/5 — Subscription only *2021-09-17, version 6.5.1* Free download, but you have to pay monthly to use it. ### 1/5 — Book scanner *2021-06-25* Diese Software ist ein Totalversager. Worst scan app ever. It is not useful at all. It is only waste of time. **Developer response:** Hi Ralf, I am sorry to hear the app did not work well for you. Can you please contact us at help.clz.com so that we can investigate and maybe help you get it to work for you? ### 1/5 — Ничего не добавляет *2020-10-03* Косарик кинь тогда проверим ## Most praised reviews (10 highest-rated) ### 5/5 — Best Library Catalog App *2026-08-23, version 11.0.4* My wife and I are avid book readers, and we have accumulated over 8,000 books over the years. I wish we had discovered this sooner. We have been to many library book sales, and we came home and realized we already had a copy. Since we found CLZ, we’ve saved ourselves a lot of time and money by checking it to see if we already have what we’re looking at. Thank you so much ### 5/5 — Amazing App *2026-08-19, version 11.0.3* Customer Support actually listens to the users and fix reported bugs. This is the best app to keep organized digital and physical books, easy to use, beautiful interface, fully customizable. I recommend it 100%, I have been using it for over two years and I wouldn’t change it for any other app. ### 5/5 — LOVE THIS! *2026-08-17, version 11.0.2* Have been hunting for a way to quickly and effectively catalog my home library and CLZ Books is the PERFECT app to do so. I was able to catalog over 250 books in under an hour and it helped me reacquaint myself with old treasures and keep track of what I do and do not have in my collection. I should’ve done this years ago. Thank you! ### 5/5 — Indispensable *2026-07-21, version 11.0.1* I recently purchased the CLZ Book app and it’s fast becoming another CLZ favorite (I’ve used the Music and Movie apps for many, many years). Hundreds of books are now in a manageable data base with no more physically searching shelves and stacks to see what I have, making it easy to check that I’m not purchasing another copy of a title. ### 5/5 — Beste *2026-07-17* Ich liebe einfach alles an dieser App. Wenn man seine Bücher sortiert in einer App haben möchte und keine Social Media artigen Community Funktionen braucht, dann hat man hier alle Möglichkeiten und Freiheiten. ### 5/5 — Fabulous app *2026-07-07, version 10.7.3* This app is brilliant for recording books I have read or want to read. I no longer buy books I have already read ### 5/5 — Amazing app *2026-06-27, version 10.7.3* If you have a home library that is outgrowing your memory, do yourself a favor and download CLZ Books immediately. I have tried countless cataloging apps, spreadsheets, and site-based trackers over the years, but nothing touches the speed, depth, and sheer brilliance of this app. Why It’s in a League of Its Own: Lightning-Fast Scanning: The barcode scanner is a marvel. You can literally walk down your shelves, scan one book after another in rapid succession, and watch your digital library build itself in real time. It rarely misses a beat, even on older or international editions. Impeccable Database Accuracy: CLZ’s core database is incredibly robust. It doesn't just pull the title and author; it fetches high-quality cover art, publisher details, publication dates, page counts, and genres. For older books without barcodes, the manual search by ISBN or author is smooth and highly accurate. No More Duplicate Buys: The absolute best feature for any serious book lover is the instant duplicate warning. If you’re at a used bookstore or an estate sale and can’t remember if you already own a specific edition, one quick scan tells you exactly what’s on your shelf back home. It has saved me money and shelf space more times than I can count. Seamless Cloud Syncing: The app syncs flawlessly with the CLZ Cloud. Whether you are checking your collection on your phone while out, organizing on an iPad on the couch, or managing a massive collection via their optional web version (Book Connect), everything stays perfectly in lockstep. Deep Customization: It allows you to track whatever matters to you—loan statuses, reading progress, purchase dates, condition, and even custom tags or storage locations (e.g., "Living Room Shelf A"). The Bottom Line CLZ Books is clearly built by collectors, for collectors. It turns the daunting, tedious task of inventorying thousands of books into an incredibly satisfying, addictive weekend project. The interface is clean, the performance is rock-solid, and the development team is constantly rolling out meaningful updates. It is worth every single penny of the subscription. Highly, highly recommended! ### 5/5 — Exceptionally good app *2026-06-26, version 10.7.3* CLZ Books is an app I have used for several years to keep track of my library. It keeps track of and will search all of the relevant data. I find it easy to enter data into, even data about books that are unusual, such as facsimiles of ancient manuscripts. My only complaint is that it cannot read my mind and warn me that I am thinking about a book already in my library. It is my failure to check this app that has had me purchasing duplicate copies that I already own. So I recommend it - and I recommend checking it before you purchase a book. ### 5/5 — Best out there *2026-06-26, version 10.7.3* This is by far the best book library on apple. So easy to add books to library and lots of options to get your library organised the way you want. Worth the subscription! ### 5/5 — My Go-To For Years *2026-06-24, version 10.7.3* I’ve used CLZ Books (and Music) for years. It’s the simplest way I’ve found to keep track of my collections. The camera driven ISBN scanner is brilliant. And in the rare case it doesn’t find the book I’m adding, the manual entry method is easy to use as well. Don’t let ‘simple’ put you off though. The app allows you to filter as many ways as you can imagine. Its ability to track books series is excellent and extremely useful for me. Highly recommended. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*