purplecandy/calibre-zen v0.2.0 on GitHub

Calibre Zen 0.2.0, on calibre 9.15.0.

Updates now install from inside the app. Editing a book fits in a smaller window, and the welcome can bring your calibre settings over.

What's new

Updates install themselves. When a new version is out, click Download, then Install and restart. The app closes, updates and opens again. This version is the first with it, so install 0.2.0 the usual way.
A smaller Edit metadata window. Details, Cover & files and Your columns are tidy forms on tabs, in a window that fits beside your library.
New controls everywhere. Star ratings you click, a calendar with Today and Clear, and cleaner lists, number fields and text boxes.
Download metadata, redone. Matches show as cards and covers as tiles, with a preview of what would change.
Bring your calibre settings over. The welcome starts with three choices: bring them over, start fresh, or pick exactly what comes. Your current settings are backed up first.
Back to Zen's look in one click. Preferences, Look & feel has a reset for settings that pull against the theme.
Double-click to edit a cell in the book table.
Cover shape in the cover grid's view menu. Keep each cover whole, or crop them all to one size.
Flatpak for Linux, on x86_64 and arm64.
calibre 9.15.0 underneath, with its fixes for reading, conversion and metadata.

Selected rows show the accent colour, and the icon on a dialog's main button matches its label.
The Linux archive installs cleanly, and says what is missing when a library is not there.

The packages are calibre's own 9.15.0 builds with Calibre Zen's Python laid over them. Nothing is recompiled.

Windows. calibre-zen-0.2.0-windows-x64.msi installs and upgrades in place. calibre-zen-portable-installer-0.2.0.exe upgrades a Calibre Zen Portable folder and keeps its library. Unsigned, so SmartScreen warns on first run: More info, then Run anyway.
macOS. calibre-zen-0.2.0-macos.dmg, universal, signed and notarized. Drag Calibre Zen to Applications.
Linux. calibre-zen-0.2.0-linux-x86_64.txz or -arm64.txz. Unpack anywhere and run calibre-zen/calibre-zen. The .flatpak bundles install with flatpak install.

Each file has a .sha256 beside it. latest.json is the feed the app reads to find and install updates.