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.
A new web app
Section titled “A new web app”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.
Good to know
Section titled “Good to know”- 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.
On a Mac
Section titled “On a Mac”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.
calibre 9.18 underneath
Section titled “calibre 9.18 underneath”- 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.
Smaller changes
Section titled “Smaller changes”- 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.