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