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

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