Sites and apps similar to Flow include calibre, which is free and open source. Other options are SumatraPDF, Readest, KOReader and Koodo Reader. Ebook Readers like Flow are a crowded field, with more than 50 alternatives for Android, Windows, Linux, Mac and iPad.
Offers viewing, searching, printing, and text copying for PDF files on Android. Streamlined for quick access and on-the-go use, optimized for work environments without Drive integration, lightweight, free, and requires minimal permissions.
United States
The simplest PDF viewer. Safe (doesn't require permissions), lightweight (just 6,9MB) and modern.
Italy
EU
An ebook reader and library management app supporting ".epub" files. Arianna discovers your books automatically, and sorts them by categories, genres and authors.
GermanyEU
TypoZen is a Markdown editor and an ePub reader in one quiet window: somewhere to write in the morning and somewhere to read in the evening, without switching apps or going near the internet.
United Kingdom
India
Convert eBooks into multiple formats like EPUB, PDF, or Mobi seamlessly, preserving original display. Edit metadata for personalization. Compatible with major e-Readers and apps like Kindle, Kobo, and Adobe Digital Editions, allowing book enhancements and customizable reading experiences.
China
eBooks.com's Ebook Reader lets you read your favorite books on the go. Choose from a massive collection of popular books that you can download in a jiffy.
Australia
DinoReader is built on the FBReader reading engine, but includes features not currently available in the mainstream app:
United Kingdom
