Ko Books
EN
Day or night
Four cloth-bound copies of Moby-Dick fanned in a cascade, slate, oat, oxblood and moss linen, each cover foil-stamped with its format: EPUB, PDF, FB2, MOBI. The four bindings of Moby-Dick under a lamp at night.

In development · macOS and Windows

Ko Books

A library for your e-books. Add them once, find any of them in a second, read them, and send them to your e-reader or Kindle. The books stay files in a folder you choose, on your own disk.

Runs on
macOS and Windows
Adds
EPUB, KEPUB, FB2, FB2.ZIP, PDF, MOBI, AZW3, TXT; a Calibre library
Reads
EPUB, FB2 and PDF, in its own reader
Sends to
Kobo, Kindle, PocketBook, tolino and Android over USB; Kindle by email
Your library
Ordinary files in a folder you choose, with daily backups
Account
None. No telemetry
Price
14 days free, then $29.99 once, or Plus
Release
No date yet

One library, on your disk

Ko Books copies each book into its library folder, sorted by author and title so the folder makes sense without the app. Its catalogue sits beside the books and is backed up every day. Nothing is uploaded anywhere.

Your e-reader and Kindle

Connect a Kobo, Kindle, PocketBook or tolino and it appears in the sidebar. Ko Books copies the books you choose, checks each copy, and never touches what it didn't put there. For a Kindle far away, Send to Kindle goes by your own email.

Coming from Calibre

Ko Books reads a Calibre library and copies its books, with their authors, series, tags and covers. The Calibre library itself is never changed, so you can keep using it.

The Sci-fi shortlist collection in the cover grid: twelve cloth-textured covers with titles and authors. Ancillary Justice by Ann Leckie is selected, and the Book details panel beside the grid shows its cover, format AZW3, size, series Imperial Radch, a Classics tag and the file. The Sci-fi shortlist collection in the cover grid: twelve cloth-textured covers with titles and authors. Ancillary Justice by Ann Leckie is selected, and the Book details panel beside the grid shows its cover, format AZW3, size, series Imperial Radch, a Classics tag and the file.
A collection in the cover grid, one book's details beside it. Sample library. Screenshots