Apps similar to LilyView include Clotski. It's paid, but JustLooking is free. Other options are Xee, Phiewer and ViewPic. In total there are five Image Viewers like LilyView for Mac.
Seamlessly browse and share images directly from your menu bar application, with support for tagging, searching, and drag-and-drop functionality. Experience full keyboard control and effortless integration with the pasteboard, enabling automatic image collection and streamlined workflows.
Xee is an streamlined and convenient image viewer and browser. It is similar to macOS's Preview.app, but lets you easily browse the entire contents of folders and archives, move and copy image files quickly, and supports many more image formats.
Ukraine
Phiewer is the easiest and fastest way to view your images, videos and even audio files. It's folder based so you can just browse your media in one window without any extra clicking and selecting.
Austria
EU
ViewPic is a lightning fast and image viewer for Mac OS X, you can quickly browse through all images in a folder.
China
Fast and simple image viewing program for Mac OS X. JustLooking is designed to be used instead of the Preview application on your computer for browsing most image file formats.
