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GNOME Calendar vs Era: catalog facts
GNOME Calendar	Era
Free Free GNOME application supported by donations.	Free Free and open source under the GPL-3.0-or-later.
Linux	Linux
Syncs with Nextcloud, Google Calendar and CalDAV servers Local calendars work fully offline	Designed for the GNOME desktop Open source and available on Flathub
Designed for the GNOME desktop on Linux Kept deliberately simple, with fewer features than full groupware clients	Young project with a short track record Linux only
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.