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nomacs vs QuickViewer: catalog facts
nomacs	QuickViewer
Free Free and open source under the GPL 3.0.	Free Free software under GPLv3.
Windows, macOS, Linux	Windows, macOS, Linux
Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines	Opens image archives directly Supports two-page comic viewing
Not an editor; adjustments are minimal The interface exposes a lot of panels at once	Linux users need to build QuickViewer from source.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 8, 2026

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