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ImageGlass vs nomacs: catalog facts
ImageGlass	nomacs
Freemium A free edition plus a paid Pro edition, listed at $14.90 as a one-time purchase for one…	Free Free and open source under the GPL 3.0.
Windows, macOS, Linux	Windows, macOS, Linux
Over ninety formats natively, including WebP, JPEG XL, HEIC, AVIF, SVG, HDR and raw Fast navigation through large folders with predictive caching and hardware acceleration	Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines
Some features are reserved for the paid Pro edition The macOS and Linux builds are much newer than the Windows one	Not an editor; adjustments are minimal The interface exposes a lot of panels at once
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 21, 2026

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