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Popsicle vs Caligula: catalog facts
Popsicle	Caligula
Free Free and open source.	Free Free and open source.
Linux, Command line	macOS, Linux, Command line
Flashes several USB drives in parallel GTK interface plus a command-line version	Interactive terminal interface instead of raw dd commands Progress display while writing
Linux only Focused on writing images, with no image download feature	No graphical interface No Windows support indicated
Downloadable app	Downloadable app
Open source	Open source
License not stated	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.