Fablum as a calibre alternative on your phone

calibre's download page offers Windows, macOS and Linux, and every line about it here was read on calibre's own site and manual. It runs on a computer, and the phone is where it stops. That is what this page is about.

Side by side

Capability	Fablum	calibre	Read on
Devices	iPhone, iPad and Android	Windows, macOS and Linux; the download page offers no phone or tablet app	Source 2026-10-10
Offline	Downloaded books open with no connection	The server keeps the book you are reading in an offline cache	Source 2026-10-10

Where calibre is ahead

Capability	Fablum	calibre	Read on
File formats	EPUB and PDF	Its built-in viewer displays all the major e-book formats	Source 2026-10-10
Working on the library	Search, genre filters and sorting, and you can edit a book's title and author	Downloads and edits metadata, converts between formats, and edits the innards of EPUB and Kindle files	Source 2026-10-10
Catalogs	The catalog is built in	Its Content server hands your calibre libraries to a browser on your phone or tablet	Source 2026-10-10
What it costs	Free for 5 books at a time, then a one-time unlock, no subscription	Free and open source	Source 2026-10-10

All comparisons