Apps similar to GNOME Sushi include Folder Quick Look. It's paid, but Preview and Kiview are free. Other options are Folder Preview, Quick Eye, Gloobus Preview and Quick Look Fix. In total there are nine Image Viewers like GNOME Sushi for Mac, Linux, Windows, iPhone and iPad.
Folder Quick Look is a macOS extension that enhances the system’s Quick Look feature by allowing users to instantly preview the contents of folders and compressed archives without opening them. Once installed, you can simply select a folder or supported archive format (such as...
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Native macOS app for viewing, annotating, and editing images and PDFs, featuring tools for cropping, rotating, resizing images, rearranging pages, full-screen viewing, markup, document merging, batch conversion, and export in multiple formats.
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Kiview gives the user the ability to quickly preview different file types without the need to launch the default application.
Folder Preview is a Quick Look extension that lets you preview the contents of a folder.
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Quick Eye is a quick look application for Windows. Just press the space bar to quickly preview files. This software is also recommended for people who are used to macOS.
Gloobus-preview is a Gnome extension designed to enable a full screen preview of any kind of file similar to Apple's Quicklook.
When Quick Look spacebar preview of your Mac doesn't work and you end up with the thumbnail of the photo, you can use Quick Look Fix from the menu bar.
Very much like Folder Preview, Folder Preview Pro allows you to quick look folders in Finder.
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