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Impression vs Caligula: catalog facts
Impression	Caligula
Free Free and open source under the GPLv3.	Free Free and open source.
Linux	macOS, Linux, Command line
Minimal interface focused on one task Fits in with the GNOME desktop	Interactive terminal interface instead of raw dd commands Progress display while writing
Linux only Fewer options than full-featured image writers	No graphical interface No Windows support indicated
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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