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UNetbootin vs USBImager: catalog facts
UNetbootin	USBImager
Free Free and open source under the GPL.	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Windows, macOS, Linux
Runs on Windows, macOS and Linux with the same interface Optional persistence file keeps changes between boots	Writes compressed images without unpacking first Runs on Windows, Linux and macOS
Fails or produces unbootable media with several modern hybrid ISOs Development is slow and the interface is very dated	Deliberately minimal feature set Writing to the wrong drive erases it
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: MIT
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 September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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