When comparing Xee vs Image Viewer Ultimate, the Slant community recommends Xee for most people. In the question“What are the best image viewers for OS X?” Xee is ranked 1st while Image Viewer Ultimate is ranked 7th. The most important reason people chose Xee is:
It's good for browsing through folders with pictures. Double click one picture, then use left/right to go to next previous (Modeled after Windows XP image viewer).
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Pros
Pro Easy to browse through picture folders quickly
It's good for browsing through folders with pictures. Double click one picture, then use left/right to go to next previous (Modeled after Windows XP image viewer).
Pro Very good quality pics
Pro Recompiled open source version 2 can run on Mojave in 64-bit
Version 2.x was open source and so can be recompiled to run on Mojave 64-bit with some source code modification. Thanks to the author who left some old code that works well in 64-bit. But 64-bit has some restrictions. QuickTime.framework is not available so Xee will not open QuickTime files.
You can download and try 64-bit Xee build here.
Pro Watermark support
You can add watermark to bulk images.
Pro Slideshow and full screen
You view as slideshow or full screen mode
Pro Cactus digital
A pro digital compay recomendation on ease of use.
Cons
Con Abandoned by developer
The developer no longer responds to support or giving info about the app development roadmap.
Con Lacks next gen image format support
Newer generation of images like HEIC and AVIF are not supported. Developers no longer maintain the app.
Con M1/2: Fails randomly to load images
Con Cropping doesn't work
On the latest MacOS (Monterey), cropping no longer works.
Con Not for new M1 chip Mac's
Cannot handle with new chips M1 of Apple.
Con Basic features missing
Con It's free only for 1 month
Con Not for new systems
Cannot handle Mojave.
Con Display bugs in copy/move panel and random restarts
Move/Copy panel items randomly disappear. Viewer also randomly restarts a the beginning of a folder if you delete or move files too quickly. Can't assign shortcuts to more than 10 move/copy destinations.
Con It feels sluggish when traversing through pictures quickly
