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CactusViewer vs Imagine: catalog facts
CactusViewer	Imagine
Free Free and open source under the BSD 2-Clause licence; donations are welcome.	Free Freeware.
Windows	Windows
Single executable with no installer needed GPU rendering through a custom Direct3D 11 renderer	Very small download with fast loading Broad format support including camera RAW and modern formats like JXL and AVIF
Windows only No packaged releases on the GitHub repository	Windows only Closed source freeware
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-2-Clause	License: Freeware
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 October 2, 2026

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