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0.5.0

A new web app for your library, to browse, read and edit from any browser. Released November 13, 2026, on calibre 9.18.

Open your server’s address on a phone or another computer, and the new web app is there. It has the same calm look as the desktop app.

  • Browse. Search, filter and sort in a grid or a list, and switch between libraries.
  • Read. Continue reading sits at the top of the sidebar. Keep books on a device to read them offline.
  • Edit. Change any field, the cover or the formats. Add books by upload, delete them, or copy and move them to another library.
  • Search inside books and convert them, each from its own page.
  • Your settings follow you to every device you sign in on.
  • It works offline. The library and its covers stay on your device, and the app opens in the view you left it in.
  • calibre’s web app is one click away. The new app’s menu opens it, and a button on calibre’s home screen brings you back.
  • You choose which app opens first. Untick the new box in Preferences → Sharing over the net to keep calibre’s app at the address. On Docker, set CALIBRE_ZEN_WEB_HOME=calibre.
  • calibre’s reader in the browser has the same look as the desktop reader.

Run it on a home server gets your library onto every browser in the house.

A book opened from Finder, Spotlight or Open With now opens in Zen’s reader, even with calibre installed. The editor works the same way.

  • Natural voices for Read aloud. The new Kokoro voices sound much closer to a person reading.
  • Reading progress syncs with KOReader through your server.
  • Search only the current chapter in the reader.
  • A new Accessibility tool in the book editor sets image descriptions and languages, and checks for problems.
  • Faster in big libraries, with many fixes for converting PDF, EPUB and DOCX.
  • Books without a cover show a card with the title and author in the cover grid. The ring shows on them when you select or point at them.
  • Text in the cover grid is easy to read in light schemes.
  • Past searches under the search box have a background, so they stand out from the window.
  • The update link no longer offers version 0.0.0.
  • Links in the app now go to calibrezen.com.

Download calibre-zen

Version 0.4.1 · on calibre 9.15.0 · Oct 11, 2026

Windows

macOS

Linux

Run in a terminal from the folder where you want the app:

curl -fL https://raw.githubusercontent.com/purplecandy/calibre-zen/zen/packaging/linux/install-zen.sh -o install-zen.sh && sh install-zen.sh --latest && ./calibre-zen/calibre-zen --version

Or download an archive below and install it manually.

Source

Windows packages are not code-signed yet, so SmartScreen will ask you to confirm: More info → Run anyway. Every file has a checksum beside it on the release page.