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ImageGlass vs CactusViewer: catalog facts
ImageGlass	CactusViewer
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 BSD 2-Clause licence; donations are welcome.
Windows, macOS, Linux	Windows
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	Single executable with no installer needed GPU rendering through a custom Direct3D 11 renderer
Some features are reserved for the paid Pro edition The macOS and Linux builds are much newer than the Windows one	Windows only No packaged releases on the GitHub repository
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: BSD-2-Clause
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 October 2, 2026

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