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Caligula vs ISO Image Writer: catalog facts
Caligula	ISO Image Writer
Free Free and open source.	Free Free and open source under the GPL 3.0.
macOS, Linux, Command line	Linux
Interactive terminal interface instead of raw dd commands Progress display while writing	Single-purpose tool for writing ISO images to USB Graphical alternative to dd
No graphical interface No Windows support indicated	Fewer options than full-featured USB writers Linux build on Flathub only, according to the research
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
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.