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ISO Image Writer vs Caligula: catalog facts
ISO Image Writer	Caligula
Free Free and open source under the GPL 3.0.	Free Free and open source.
Linux	macOS, Linux, Command line
Single-purpose tool for writing ISO images to USB Graphical alternative to dd	Interactive terminal interface instead of raw dd commands Progress display while writing
Fewer options than full-featured USB writers Linux build on Flathub only, according to the research	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 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.