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JarkViewer vs CactusViewer: catalog facts
JarkViewer	CactusViewer
Free Free and open source.	Free Free and open source under the BSD 2-Clause licence; donations are welcome.
Windows	Windows
Opens AVIF, HEIC and JPEG XL without extra codecs Handles animated images, RAW files and Live Photos	Single executable with no installer needed GPU rendering through a custom Direct3D 11 renderer
Windows only Viewer only, with no editing or library features	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 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.