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CactusViewer vs IrfanView: catalog facts
CactusViewer	IrfanView
Free Free and open source under the BSD 2-Clause licence; donations are welcome.	Freemium Free for private, educational and charitable use. A paid licence is required for…
Windows	Windows
Single executable with no installer needed GPU rendering through a custom Direct3D 11 renderer	Opens instantly, even on old hardware Batch conversion and renaming across whole folders
Windows only No packaged releases on the GitHub repository	Windows only and closed source Commercial use needs a paid licence
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-2-Clause	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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