# Calibre Sync — user reviews > 80 indexed App Store user reviews of Calibre Sync by DUONG THUY PHAM, rated 3.93/5 from 54 ratings. - Source: https://appshunter.io/ios/app/calibre-sync/id1609138078/reviews - App overview in markdown: https://appshunter.io/ios/app/calibre-sync/id1609138078.md - Rating breakdown: 5★ 33 · 4★ 5 · 3★ 5 · 2★ 1 · 1★ 10 ## Newest reviews (11 of 80) ### 4/5 — Mostly great except the popup you can’t get rid of *2026-05-18* Notice reappears every launch even without configured cloud accounts/keychain use.” **Developer response:** Hi, You can dismiss that notice, after that, it will not show again. Cheers ### 5/5 — This excellent app is working again! *2026-04-03* Many thanks to the new developer who has fixed this for Calibre 9. Love the app - it really completes Calibre functionality for me. ### 5/5 — Essential app for Calibre users *2026-03-31* This is such a useful app. I love it. As Calibre doesn’t run on my iPad this is essential me as I can search my Dropbox Calibre library, download any book I want to read on the iPad, and even search with Calibre’s full text search. Got message when starting the app today that the app has a new developer. I hope he or she will continue to maintain and enhance the app. ### 5/5 — Tolle App - funktioniert wieder - alle Sterne zurück *2026-03-31* Die beste ebook-App funktioniert wieder! Neuanmeldung hat zunächst nicht funktioniert, ich musste die App löschen und neu installieren. Ich bin gerne bereit, einen einmaligen Obolus zu errichten! ### 5/5 — Funzt wieder mit Calibre 9.x *2026-03-30* Mit dem Update auf Version 6.7.0 funktioniert Calibre Sync nun auch wieder mit den aktuellen Calibre Versionen 9.x. Vielen Dank an den neuen Entwickler. ### 5/5 — What’s happened? Database error doesn’t work now *2026-03-20, version 6.6.3* Love the app but suddenly it doesn’t work on either iPad or iPhone - just giving a database error. I really hope this gets fixed. ### 5/5 — Finally *2026-03-19* Update: Calibre version 9 bricked it, if you absolutely rely on this app stay on the latest version of 8, doesn’t look like anyone’s seen a developer response for a fix in a few weeks now. Brilliant 5 star app, really hoping the dev returns to it. There’s a few things I’ve learned in all my time spent meticulously curating, indexing, and cataloging my library through calibre and one of those is that certain file types, regardless of what you assign them in Calibres own metadata fields, do not hold certain types of metadata. So PDFs (and irritatingly enough, CBR/Zs) aren’t capable of being organised by series in e-readers. They also struggle with cloud syncing in the way that while they sync physical files, they won’t just show what you have in your cloud for download, and they certainly don’t keep that organised either. CalibreSync completely solves these issues by not only mirroring your calibre library the way you’ve designed it, but also by making your collection viewable and searchable without needing physical copies of the files on your device (via cloud syncing), and downloadable on demand, whilst still being able to scroll through them all in an easily accessible catalogue of your own design. You can even open your books from here into your chosen e-reader. This is exactly the type of app I needed, and well worth the payment. ### 3/5 — Ça ne fonctionne plus *2026-03-11* Malheureusement, j’ai un message d’erreur depuis environ 15 jours et les nouveaux libres ne sont plus synchronisés. J’ai vu que d’autres utilisateurs avaient les mêmes problèmes mais les solutions proposées sont trop techniques pour moi. J’espère que l’appli sera mise rapidement à jour. ### 4/5 — Love it, but Needs update *2026-03-06* I love this app, but since Calibre version 9, this app no longer able to sync/connect to the database. Please update the app :). ### 5/5 — Support no longer replies *2026-03-02* Once responsive to questions the developer seems to have lost interest in this project….. help is no longer given…shame…it was once a useful app!! **Developer response:** hi Gordie, could you please let us know what is your email about? We haven’t found any email with your name in our mailbox. Regards. ### 5/5 — Finally *2026-02-27, version 6.6.3* There’s a few things I’ve learned in all my time spent meticulously curating, indexing, and cataloging my library through calibre and one of those is that certain file types, regardless of what you assign them in Calibres own metadata fields, do not hold certain types of metadata. So PDFs (and irritatingly enough, CBR/Zs) aren’t capable of being organised by series in e-readers. They also struggle with cloud syncing in the way that while they sync physical files, they won’t just show what you have in your cloud for download, and they certainly don’t keep that organised either. CalibreSync completely solves these issues by not only mirroring your calibre library the way you’ve designed it, but also by making your collection viewable and searchable without needing physical copies of the files on your device (via cloud syncing), and downloadable on demand, whilst still being able to scroll through them all in an easily accessible catalogue of your own design. You can even open your books from here into your chosen e-reader. This is exactly the type of app I needed, and well worth the payment. ## Most critical reviews (10 lowest-rated) ### 1/5 — Lies *2026-04-03* The new update from the new dev is a lie. The new calibre database 9+ doesn’t work. If/when it does I’ll change my review. ### 1/5 — Stopped working *2026-03-29* Always loved this app, but it has stopped working since the calibre update **Developer response:** Hi, the new version of the app should fix the issue, please check it out, cheers. ### 1/5 — No longer works *2026-03-14, version 6.6.3* In spite of a number of emails to the developer received no response ### 1/5 — Projekt ist tot *2026-03-09* Das war mal eine sehr gute App, für die ich sogar gezahlt habe. Leider funktioniert sie mit der aktuellen Datenbankversion von Calibre nicht mehr und der Support reagiert nicht. Schade! ### 1/5 — Broken since calibre v9 *2026-02-27, version 6.6.3* App is broken since calibre version 9 because of deprecated database columns ### 1/5 — Stopped working recently *2026-02-18* Can’t sync anymore since a recent Calibre update. Bug is reported and so how documented on some social networks. No answer/no support from Calibre sync. Hopefully, this will be resolved one day since this is a very useful app. **Developer response:** Hi, the new version of the app should fix the issue, please check it out, cheers. ### 1/5 — Stopped Working. Developer Non-Responsive. *2026-02-16* Behind the scene changes in Calibre broke this app. I and others have reached out to the developer asking about a fix to no response. I really hope it is updated; if so I’ll revise this review, but for now it seems like it was abandoned. ### 1/5 — No longer works. Don't buy. *2026-02-14* As of the release of Calibre 9 this app is broken and the developer has not responded on when it will work again. Don't spend your money on it. If it is fixed and works with Calibre 9 I will delete /update this review. I really liked this app. **Developer response:** Hi, the new version of the app should fix the issue, please check it out, cheers. ### 1/5 — Possible abandonware *2026-02-08, version 6.6.3* No longer compatible with version 9 of Calibre ### 1/5 — Waste of money *2026-01-31* Doesn’t work **Developer response:** Hi, the new version of the app should fix the issue, please check it out, cheers. ## Most praised reviews (10 highest-rated) ### 5/5 — Finally *2026-08-07* Update 2: It’s working again and I can’t rate the new dev highly enough for knowing there was a niche that needed to be filled and picking up the torch. Thank you for seeing the value in this. Update: Calibre version 9 bricked it, if you absolutely rely on this app stay on the latest version of 8, doesn’t look like anyone’s seen a developer response for a fix in a few weeks now. Brilliant 5 star app, really hoping the dev returns to it. There’s a few things I’ve learned in all my time spent meticulously curating, indexing, and cataloging my library through calibre and one of those is that certain file types, regardless of what you assign them in Calibres own metadata fields, do not hold certain types of metadata. So PDFs (and irritatingly enough, CBR/Zs) aren’t capable of being organised by series in e-readers. They also struggle with cloud syncing in the way that while they sync physical files, they won’t just show what you have in your cloud for download, and they certainly don’t keep that organised either. CalibreSync completely solves these issues by not only mirroring your calibre library the way you’ve designed it, but also by making your collection viewable and searchable without needing physical copies of the files on your device (via cloud syncing), and downloadable on demand, whilst still being able to scroll through them all in an easily accessible catalogue of your own design. You can even open your books from here into your chosen e-reader. This is exactly the type of app I needed, and well worth the payment. ### 5/5 — Excellent *2026-07-19* Permet d’avoir sur son iPhone une ou plusieurs bibliothèques Calibre accessibles car stockées dans un service cloud. Permet de récupérer un/plusieurs livres et les ouvrir dans son lecteur favori. Bien sûr fonctionne en « lecture seule » sur le service cloud. Pas d’écriture vers le cloud. ### 5/5 — Great app. Works well. *2026-07-16* It worked great to connect to my Calibre library. Syncs easily and gives me a great way to browse through my collection. ### 5/5 — Calibre Sync funktioniert wieder, vielen Dank! *2026-07-05* Calibre Sync funktioniert wieder, vielen Dank! **Developer response:** Hi, the new version of the app should fix the issue, please check it out, cheers. ### 5/5 — Works again! *2026-07-03* Very fast and efficient way to get books from your Calibre installation. **Developer response:** Hi, the new version of the app should fix the issue, please check it out, cheers. ### 5/5 — New dev fixed the app! *2026-07-03* Thanks to the new dev, this app works great again **Developer response:** Hi, the new version of the app should fix the issue, please check it out, cheers. ### 5/5 — Works with calibre 9 *2026-05-20* For anyone looking, the app has recently been taken over by a new developer and I can confirm it works now with calibre 9 — specifically I have my library in iCloud Drive, and everything does sync in and is accessible without issue. I would love a bit more customizability with the viewing options, but this does do everything in terms of displaying the library and being able to filter and download books without needing my computer on and running the content server in order to access my books on another device with all the metadata attached. ### 5/5 — New developer *2026-05-19* Now being supported again, great news excellent app. A must have if you have Calibre. ### 5/5 — Parfait compagnon pour Calibre *2026-04-05* Vraiment génial pour avoir un accès à sa bibliothèque Calibre depuis n’importe où ! Fonctionne parfaitement avec calibre v9 (ou v8). ### 5/5 — Works now with Calibre 9! *2026-04-04* The new update is working for me as of this writing! Syncing worked without any hiccups. I just can’t seem to keep the Important Notice from showing up every launch. Love this app! --- *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 2026-08-29.*